Prudential Municipal Series Fund
(Maryland Series)
 
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PROSPECTUS DATED NOVEMBER 2, 1998
    
 
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Prudential Municipal Series Fund (the Fund) (Maryland Series) (the Series) is
one of thirteen series of an open-end, management investment company, or mutual
fund. This Series is diversified and is designed to provide the maximum amount
of income that is exempt from Maryland State and federal income taxes consistent
with the preservation of capital and, in conjunction therewith, the Series may
invest in debt securities with the potential for capital gain. The net assets of
the Series are invested primarily in obligations within the four highest ratings
of Moody's Investors Service, Standard & Poor's Ratings Group or another
nationally recognized statistical rating organization or in unrated obligations
which, in the opinion of the Fund's investment adviser, are of comparable
quality. The Series may, however, also invest a portion of its assets in lower-
quality municipal obligations or in non-rated securities which, in the opinion
of the Fund's investment adviser, are of comparable quality. Subject to the
limitations described herein, the Series may utilize derivatives, including
buying and selling futures contracts and options thereon for the purpose of
hedging its portfolio securities. There can be no assurance that the Series'
investment objective will be achieved. See "How the Fund Invests--Investment
Objective and Policies." The Fund's address is Gateway Center Three, 100
Mulberry Street, Newark, New Jersey 07102-4077, and its telephone number is
(800) 225-1852.
 
   
The Trustees of the Fund have recently approved a proposal to exchange the
assets and liabilities of the Series of the Fund for shares of Prudential
National Municipals Fund, Inc. (National Municipals Fund). Class A, Class B and
Class C shares of the Series would be exchanged at relative net asset value for
Class A shares of National Municipals Fund. The transfer has been approved by
the Trustees of the Fund and by the Board of Directors of National Municipals
Fund and is subject to approval by the shareholders of the Series. It is
anticipated that a proxy statement/prospectus relating to the transaction will
have been mailed to the Series' shareholders in late October 1998. EFFECTIVE
IMMEDIATELY, THE FUND WILL NO LONGER ACCEPT ORDERS TO PURCHASE OR EXCHANGE FOR
SHARES OF THE SERIES, EXCEPT FOR PURCHASES BY CERTAIN RETIREMENT AND EMPLOYEE
PLANS (EXCLUDING IRA ACCOUNTS). Existing shareholders may continue to acquire
shares through dividend reinvestment. The current redemption privilege and the
current exchange privilege of obtaining shares of other Prudential Mutual Funds
will remain in effect until the transaction is consummated. If the transaction
is not consummated, the Fund will resume accepting orders to purchase or
exchange for shares of the Series. See "Shareholder Guide--How to Buy Shares of
the Fund."
    
 
   
This Prospectus sets forth concisely the information about the Fund and the
Maryland Series that a prospective investor should know before investing and is
available at the Web site of the Prudential Insurance Company of America
(http://www.prudential.com). Additional information about the Fund has been
filed with the Securities and Exchange Commission (the Commission) in a
Statement of Additional Information dated November 2, 1998, which information is
incorporated herein by reference (is legally considered a part of this
Prospectus) and is available without charge upon request to the Fund at the
address or telephone number noted above. The Commission maintains a Web site
(http://www.sec.gov) that contains the Statement of Additional Information,
material incorporated by reference and other information regarding the Fund.
    
 
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INVESTORS ARE ADVISED TO READ THIS PROSPECTUS AND RETAIN IT FOR FUTURE
REFERENCE.
 
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AN INVESTMENT IN THE FUND IS NOT A DEPOSIT OF ANY BANK AND IS NOT INSURED OR
GUARANTEED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION OR ANY OTHER GOVERNMENT
AGENCY.
    
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION NOR HAS THE SECURITIES AND EXCHANGE COMMISSION PASSED UPON
THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY
IS A CRIMINAL OFFENSE.

                                FUND HIGHLIGHTS
 
  The following summary is intended to highlight certain information contained
in this Prospectus and is qualified in its entirety by the more detailed
information appearing elsewhere herein.
  WHAT IS THE SERIES' INVESTMENT OBJECTIVE?
 
    The Series' investment objective is to maximize current income that is
  exempt from Maryland State and federal income taxes consistent with the
  preservation of capital. It seeks to achieve this objective by investing
  primarily in Maryland State, municipal and local government obligations and
  obligations of other qualifying issuers, such as issuers located in Puerto
  Rico, the Virgin Islands and Guam, which pay income exempt, in the opinion
  of counsel, from Maryland State and federal income taxes (Maryland
  Obligations). There can be no assurance that the Series' investment
  objective will be achieved. See "How the Fund Invests--Investment Objective
  and Policies" at page 8.
 
  WHAT ARE THE SERIES' RISK FACTORS AND SPECIAL CHARACTERISTICS?
 
   
    In seeking to achieve its investment objective, the Series will invest at
  least 80% of the value of its total assets in Maryland Obligations. This
  degree of investment concentration makes the Series particularly susceptible
  to factors adversely affecting issuers of Maryland Obligations. See "How the
  Fund Invests--Investment Objective and Policies--Special Considerations" at
  page 13. The Series may invest up to 30% of its total assets in high yield
  securities, commonly known as junk bonds, which may be considered
  speculative and are subject to the risk of an issuer's inability to meet
  principal and interest payments on the obligations as well as price
  volatility. See "How the Fund Invests--Investment Objective and
  Policies--Risk Factors Relating to Investing in High Yield Municipal
  Obligations" at page 11. To hedge against changes in interest rates, the
  Series may also purchase put options and engage in transactions involving
  derivatives, including financial futures contracts and options thereon. See
  "How the Fund Invests--Investment Objective and Policies--Futures Contracts
  and Options Thereon" at page 12. As with an investment in any mutual fund,
  an investment in this Series can decrease in value and you can lose money.
    
 
  WHO MANAGES THE FUND?
 
   
    Prudential Investments Fund Management LLC (PIFM or the Manager) is the
  Manager of the Fund and is compensated for its services at an annual rate of
  .50 of 1% of the Series' average daily net assets. As of September 30, 1998,
  PIFM served as manager or administrator to 66 investment companies,
  including 44 mutual funds, with aggregate assets of approximately $67
  billion. The Prudential Investment Corporation (PIC, the Subadviser or the
  investment adviser) furnishes investment advisory services in connection
  with the management of the Fund under a Subadvisory Agreement with PIFM. See
  "How the Fund is Managed--Manager" at page 15.
    
 
   
  WHO DISTRIBUTES THE SERIES' SHARES?
    
 
   
    Prudential Investment Management Services LLC (the Distributor) acts as
  the Distributor of the Series' Class A, Class B and Class C shares and is
  paid a distribution and service fee with respect to Class A shares at the
  rate of .25 of 1% of the average daily net assets of the Class A shares and
  is paid a distribution and service fee with respect to Class B shares at the
  annual rate of .50 of 1% of the average daily net assets of the Class B
  shares and is paid an annual distribution and service fee with respect to
  Class C shares which is currently being charged at the rate of .75 of 1% of
  the average daily net assets of the Class C shares. See "How the Fund is
  Managed--Distributor" at page 15.
    
 
                                       2

  WHAT IS THE MINIMUM INVESTMENT?
 
   
    The minimum initial investment is $1,000 for Class A and Class B shares
  and $2,500 for Class C shares. The minimum subsequent investment is $100 for
  Class A, Class B and Class C shares. There is no minimum investment
  requirement for certain employee savings plans. For purchases made through
  the Automatic Investment Plan, the minimum initial and subsequent investment
  is $50. See "Shareholder Guide--How to Buy Shares of the Fund" at page 22
  and "Shareholder Guide--Shareholder Services" at page 32.
    
 
  HOW DO I PURCHASE SHARES?
 
   
    You may purchase shares of the Series through the Distributor or brokers
  or dealers that have entered into agreements to act as participating or
  introducing brokers for the Distributor (Dealers) or directly from the Fund
  through its transfer agent, Prudential Mutual Fund Services LLC (PMFS or the
  Transfer Agent). In each case, sales are made at the net asset value per
  share (NAV) next determined after receipt of your purchase order by the
  Transfer Agent, a Dealer or the Distributor plus a sales charge, which may
  be imposed at the time of purchase, on a deferred basis, or both. Class A
  shares are sold with a front-end sales charge. Class B shares are subject to
  a contingent-deferred sales charge (CDSC). Class C shares are sold with a
  low front-end sales charge, but are also subject to a CDSC. Dealers may
  charge their customers a separate fee for handling purchase transactions.
  See "How the Fund Values its Shares" at page 18 and "Shareholder Guide--How
  to Buy Shares of the Fund" at page 22.
    
 
  WHAT ARE MY PURCHASE ALTERNATIVES?
 
    The Series offers three classes of shares:
 
     - Class A Shares:   Sold with an initial sales charge of up to 3% of
                         the offering price.
 
     - Class B Shares:   Sold without an initial sales charge but are
                         subject to a contingent deferred sales charge or
                         CDSC (declining from 5% to zero of the lower of the
                         amount invested or the redemption proceeds) which
                         will be imposed on certain redemptions made within
                         six years of purchase. Although Class B shares are
                         subject to higher ongoing distribution-related
                         expenses than Class A shares, Class B shares will
                         automatically convert to Class A shares (which are
                         subject to lower ongoing distribution-related
                         expenses) approximately seven years after purchase.
 
   
     - Class C Shares:   Sold with an initial sales charge of 1% of the
                         offering price and are also subject to a CDSC of 1%
                         on redemptions for a period of 18 months after
                         purchase. Class C shares are subject to higher
                         ongoing distribution-related expenses than Class A
                         shares but, unlike Class B shares, do not convert
                         to another class.
    
 
   
    See "Shareholder Guide--Alternative Purchase Plan" at page 24.
    
 
  HOW DO I SELL MY SHARES?
 
   
    You may redeem your shares at any time at the NAV next determined after
  your Dealer, the Distributor or the Transfer Agent receives your sell order.
  The proceeds of redemptions of Class B and Class C shares may be subject to
  a CDSC. Dealers may charge their customers a separate fee for handling sale
  transactions. See "Shareholder Guide--How to Sell Your Shares" at page 27.
    
 
  HOW ARE DIVIDENDS AND DISTRIBUTIONS PAID?
 
    The Series expects to declare daily and pay monthly dividends of net
  investment income, if any, and make distributions of any net capital gains
  at least annually. Dividends and distributions will be automatically
  reinvested in additional shares of the Series at NAV without a sales charge
  unless you request that they be paid to you in cash. See "Taxes, Dividends
  and Distributions" at page 19.
 
                                       3

                                 FUND EXPENSES
                               (MARYLAND SERIES)
 
   


                                                              CLASS A SHARES        CLASS B SHARES       CLASS C SHARES
                                                             -----------------  ----------------------  -----------------
                                                                                               
SHAREHOLDER TRANSACTION EXPENSES+
    Maximum Sales Load Imposed on Purchases (as a
     percentage of offering price).........................         3%                   None                  1%
    Maximum Deferred Sales Load (as a percentage of
     original purchase price or redemption proceeds,
     whichever is lower)...................................        None          5% during the first    1% on redemptions
                                                                                year, decreasing by 1%   made within 18
                                                                                annually to 1% in the       months of
                                                                                fifth and sixth years       purchase
                                                                                  and 0% the seventh
                                                                                        year*
    Maximum Sales Load Imposed on Reinvested Dividends.....        None                  None                 None
    Redemption Fees........................................        None                  None                 None
    Exchange Fee...........................................        None                  None                 None

    
 
   


                                                             CLASS A SHARES   CLASS B SHARES   CLASS C SHARES
                                                             --------------   --------------   --------------
                                                                                      
ANNUAL FUND OPERATING EXPENSES
(as a percentage of average net assets)
    Management Fees........................................        .50%              .50%            .50%
    12b-1 Fees (After Reduction)...........................        .25%++            .50%++          .75%++
    Other Expenses.........................................        .59%              .58%            .58%
                                                                   ---               ---             ---
    Total Fund Operating Expenses (After Reduction)........       1.34%             1.58%           1.83%
                                                                   ---               ---             ---
                                                                   ---               ---             ---

    
 
   


                                                              1      3      5     10
                                                             YEAR  YEARS  YEARS  YEARS
                                                             ----  -----  -----  -----
                                                                     
EXAMPLE
You would pay the following expenses on a $1,000
  investment, assuming (1) 5% annual return and (2)
  redemption at the end of each time period:
    Class A................................................  $43   $ 71   $101   $186
    Class B................................................  $66   $ 80   $ 96   $178
    Class C................................................  $38   $ 67   $108   $223
You would pay the following expenses on the same
  investment, assuming no redemption:
    Class A................................................  $43   $ 71   $101   $186
    Class B................................................  $16   $ 50   $ 86   $178
    Class C................................................  $28   $ 67   $108   $223

    
 
   
   THE EXAMPLES SHOULD NOT BE CONSIDERED A REPRESENTATION OF PAST OR FUTURE
   EXPENSES. ACTUAL EXPENSES MAY BE GREATER OR LESS THAN THOSE SHOWN.
    
 
   
   The purpose of this table is to assist investors in understanding the
   various costs and expenses that an investor in the Series will bear,
   whether directly or indirectly. For more complete descriptions of the
   various costs and expenses, see "How the Fund is Managed." The above
   examples are based on restated data for the Series' fiscal year ended
   August 31, 1998. "Other Expenses" includes Trustees' and professional
   fees, registration fees, reports to shareholders and transfer agency and
   custodian fees.
    
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*      Class B shares will automatically convert to Class A shares approximately
       seven years after purchase. See "Shareholder Guide--Conversion Feature--
       Class B Shares."
    
   
+      Dealers independently may charge additional fees for shareholder
       transactions or advisory services. Pursuant to rules of the National
       Association of Securities Dealers, Inc., the aggregate initial sales
       charges, deferred sales charges and asset-based sales charges on shares
       of the Series may not exceed 6.25% of total gross sales, subject to
       certain exclusions. This 6.25% limitation is on each class of the Series
       rather than on a per shareholder basis. Therefore, long-term shareholders
       of the Series may pay more in total sales charges than the economic
       equivalent of 6.25% of such shareholders' investment in such shares. See
       "How the Fund is Managed--Distributor."
    
   
++     Although the Class A, Class B and Class C Distribution and Service Plans
       provide that the Fund may pay a distribution fee of up to .30 of 1%, .50
       of 1% and 1% per annum of the average daily net assets of the Class A,
       Class B and Class C shares, respectively, the Distributor may voluntarily
       limit its distribution fees. Presently the Distributor limits its
       distribution fees with respect to the Class A, Class B and Class C shares
       of the Series to no more than .10 of 1%, .10 of 1% and .25 of 1% of the
       average daily net asset value of the Class A, Class B and Class C shares,
       respectively. This voluntary limitation may be modified or terminated at
       any time without notice. The Distributor anticipates modifying its
       present limitation for Class A and Class C shares so that, in the future,
       the Fund will pay distribution fees of .25% and .75%, respectively, and
       eliminating its present limitation for Class B shares so that, in the
       future, the Fund will pay distribution fees of .50%. Total Fund Operating
       Expenses of the Class A and Class C shares without any limitations would
       be 1.39% and 2.08%, respectively. See "How the Fund is
       Managed--Distributor."
    
 
                                       4

                              FINANCIAL HIGHLIGHTS
(FOR A SHARE OF BENEFICIAL INTEREST OUTSTANDING THROUGHOUT EACH OF THE INDICATED
                                    PERIODS)
                                (CLASS A SHARES)
 
   
  The following financial highlights, for the two years ended August 31, 1998,
have been audited by PricewaterhouseCoopers LLP, independent accountants and for
the three years ended August 31, 1996 have been audited by other independent
auditors. All such audit reports were unqualified. This information should be
read in conjunction with the financial statements and the notes thereto, which
appear in the Statement of Additional Information. The following financial
highlights contain selected data for a Class A share of beneficial interest
outstanding, total return, ratios to average net assets and other supplemental
data for the periods indicated. This information is based on data contained in
the financial statements. Further performance information is contained in the
annual report, which may be obtained without charge. See "Shareholder
Guide--Shareholder Services--Reports to Shareholders."
    
 
   


                                                                         CLASS A
                           ---------------------------------------------------------------------------------------------------
                                                                                                                   JANUARY 22,
                                                                                                                    1990 (a)
                                                          YEAR ENDED AUGUST 31,                                      THROUGH
                           -----------------------------------------------------------------------------------     AUGUST 31,
                            1998       1997       1996       1995       1994       1993       1992       1991         1990
                           ------     ------     ------     ------     ------     ------     ------     ------     -----------
                                                                                        
 
PER SHARE OPERATING
  PERFORMANCE:
Net asset value,
  beginning of period....  $10.99     $10.74     $10.66     $10.66     $11.64     $11.11     $10.67     $10.23       $10.44
                           ------     ------     ------     ------     ------     ------     ------     ------     -----------
INCOME FROM INVESTMENT
  OPERATIONS
Net investment income....     .48        .49(d)     .51(d)     .53(d)     .57        .62        .63        .67          .40
Net realized and
  unrealized gain (loss)
  on investment
  transactions...........     .39        .39        .08        .10       (.77)       .65        .44        .44         (.21)
                           ------     ------     ------     ------     ------     ------     ------     ------     -----------
Total from investment
  operations.............     .87        .88        .59        .63       (.20)      1.27       1.07       1.11          .19
                           ------     ------     ------     ------     ------     ------     ------     ------     -----------
LESS DISTRIBUTIONS
Dividends from net
  investment income......    (.48)      (.49)      (.51)      (.53)      (.57)      (.62)      (.63)      (.67)        (.40)
Distributions paid in
  excess of net
  investment income......      --(e)    (.01)        --         --         --         --         --         --           --
Distributions from net
  realized gains.........    (.04)      (.13)        --       (.10)      (.21)      (.12)        --         --           --
                           ------     ------     ------     ------     ------     ------     ------     ------     -----------
Total distributions......    (.52)      (.63)      (.51)      (.63)      (.78)      (.74)      (.63)      (.67)        (.40)
                           ------     ------     ------     ------     ------     ------     ------     ------     -----------
Net asset value, end of
  period.................  $11.34     $10.99     $10.74     $10.66     $10.66     $11.64     $11.11     $10.67       $10.23
                           ------     ------     ------     ------     ------     ------     ------     ------     -----------
                           ------     ------     ------     ------     ------     ------     ------     ------     -----------
TOTAL RETURN (c):........    8.01%      8.38%      5.58%      6.32%     (1.75)%    11.89%     10.35%     10.84%        1.71%
RATIOS/SUPPLEMENTAL DATA:
Net assets, end of period
  (000)..................  $18,920    $18,558    $18,339    $17,726    $2,709     $2,930     $1,335     $  804       $  349
Average net assets
  (000)..................  $18,857    $18,970    $18,484    $11,341    $2,877     $2,068     $1,080     $  518       $  141
Ratios to average net
  assets:
  Expenses, including
   distribution fees.....    1.19%      1.12%(d)   1.10%(d)   1.30%(d)    .95%       .96%       .96%      1.10%        1.01%(b)
  Expenses, excluding
   distribution fees.....    1.09%      1.02%(d)   1.00%(d)   1.20%(d)    .85%       .86%       .86%      1.00%         .91%(b)
  Net investment
   income................    4.27%      4.52%(d)   4.69%(d)   4.96%(d)   5.18%      5.51%      5.80%      6.07%        6.31%(b)
Portfolio turnover
  rate...................      34%        30%        42%        49%        40%        41%        34%        18%          46%

    
 
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   (a)  Commencement of offering of Class A shares.
 
   (b)  Annualized.
 
   (c)  Total return does not consider the effects of sales loads. Total
        return is calculated assuming a purchase of shares on the first day
        and a sale on the last day of each period reported and includes
        reinvestment of dividends and distributions. Total returns for
        periods of less than a full year are not annualized.
 
   
   (d)  Net of management fee waiver. Effective September 1, 1997, PIFM
        eliminated its management fee waiver (.05 of 1%).
    
 
   
   (e)  Less than $.005 per share.
    
 
                                       5

                              FINANCIAL HIGHLIGHTS
(FOR A SHARE OF BENEFICIAL INTEREST OUTSTANDING THROUGHOUT EACH OF THE INDICATED
                                    PERIODS)
                                (CLASS B SHARES)
 
   
  The following financial highlights, for the two years ended August 31, 1998,
have been audited by PricewaterhouseCoopers LLP, independent accountants and for
the three years ended August 31, 1996 have been audited by other independent
auditors. All such audit reports were unqualified. This information should be
read in conjunction with the financial statements and notes thereto, which
appear in the Statement of Additional Information. The following financial
highlights contain selected data for a Class B share of beneficial interest
outstanding, total return, ratios to average net assets and other supplemental
data for the periods indicated. The information is based on data contained in
the financial statements. Further performance information is contained in the
annual report, which may be obtained without charge. See "Shareholder
Guide--Shareholder Services--Reports to Shareholders."
    
 
   


                                                                          CLASS B
                        -----------------------------------------------------------------------------------------------------------
                                                                   YEAR ENDED AUGUST 31,
                        -----------------------------------------------------------------------------------------------------------
                         1998       1997       1996       1995       1994       1993       1992       1991       1990      1989(a)
                        ------     ------     ------     ------     ------     ------     ------     ------     ------     --------
                                                                                             
PER SHARE OPERATING
  PERFORMANCE:
Net asset value,
  beginning of year...  $11.00     $10.75     $10.67     $10.67     $11.65     $11.12     $10.68     $10.23     $10.48     $ 10.23
                        ------     ------     ------     ------     ------     ------     ------     ------     ------     --------
 
INCOME FROM INVESTMENT
  OPERATIONS
Net investment
  income..............     .43        .45(c)     .47(c)     .49(c)     .53        .58        .59        .63        .62         .65
Net realized and
  unrealized gain
  (loss) on investment
  transactions........     .40        .39        .08        .10       (.77)       .65        .44        .45       (.25)        .25
                        ------     ------     ------     ------     ------     ------     ------     ------     ------     --------
Total from investment
  operations..........     .83        .84        .55        .59       (.24)      1.23       1.03       1.08        .37         .90
                        ------     ------     ------     ------     ------     ------     ------     ------     ------     --------
 
LESS DISTRIBUTIONS
Dividends from net
  investment income...    (.43)      (.45)      (.47)      (.49)      (.53)      (.58)      (.59)      (.63)      (.62)       (.65)
Distributions paid in
  excess of net
  investment..........      --(d)    (.01)        --         --         --         --         --         --         --          --
Distributions from net
  realized gains......    (.04)      (.13)        --       (.10)      (.21)      (.12)        --         --         --          --
                        ------     ------     ------     ------     ------     ------     ------     ------     ------     --------
Total distributions...    (.47)      (.59)      (.47)      (.59)      (.74)      (.70)      (.59)      (.63)      (.62)       (.65)
                        ------     ------     ------     ------     ------     ------     ------     ------     ------     --------
Net asset value, end
  of year.............  $11.36     $11.00     $10.75     $10.67     $10.67     $11.65     $11.12     $10.68     $10.23     $ 10.48
                        ------     ------     ------     ------     ------     ------     ------     ------     ------     --------
                        ------     ------     ------     ------     ------     ------     ------     ------     ------     --------
 
TOTAL RETURN (b):.....    7.68%      7.94%      5.16%      5.88%     (2.13)%    11.43%      9.90%     10.49%      3.58%       9.17%
 
RATIOS/SUPPLEMENTAL
  DATA:
Net assets, end of
  year (000)..........  $12,174    $14,412    $18,512    $21,414    $51,198    $57,598    $51,313    $51,110    $48,226    $47,409
Average net assets
  (000)...............  $13,092    $16,113    $19,898    $33,497    $55,223    $53,780    $50,970    $48,422    $48,573    $44,243
Ratios to average net
  assets:
  Expenses, including
   distribution
   fees...............    1.58%      1.52%(c)   1.50%(c)   1.55%(c)   1.35%      1.36%      1.37%      1.49%      1.40%       1.37%
  Expenses, excluding
   distribution
   fees...............    1.09%      1.02%(c)   1.00%(c)   1.05%(c)    .85%       .86%       .87%       .99%       .92%        .90%
  Net investment
   income.............    3.87%      4.12%(c)   4.30%(c)   4.84%(c)   4.77%      5.11%      5.42%      5.70%      5.95%       6.26%
Portfolio turnover
  rate................      34%        30%        42%        49%        40%        41%        34%        18%        46%         47%

    
 
- -----------------
 
   
   (a)  On December 31, 1988, Prudential Mutual Fund Management, Inc.
        succeeded The Prudential Insurance Company of America as manager of
        the Fund.
    
 
   
   (b)  Total return does not consider the effects of sales loads. Total
        return is calculated assuming a purchase of shares on the first day
        and a sale on the last day of each period reported and includes
        reinvestment of dividends and distributions.
    
 
   
   (c)  Net of management fee waiver. Effective September 1, 1997, PIFM
        eliminated its management fee waiver (.05 of 1%).
    
 
   
   (d)  Less than $.005 per share.
    
 
                                       6

                              FINANCIAL HIGHLIGHTS
(FOR A SHARE OF BENEFICIAL INTEREST OUTSTANDING THROUGHOUT EACH OF THE INDICATED
                                    PERIODS)
                                (CLASS C SHARES)
 
   
  The following financial highlights, for the two years ended August 31, 1998,
have been audited by PricewaterhouseCoopers LLP, independent accountants and for
the two years ended August 31, 1996 and the period August 1, 1994 through August
31, 1994 have been audited by other independent auditors. All such audit reports
were unqualified. This information should be read in conjunction with the
financial statements and notes thereto, which appear in the Statement of
Additional Information. The following financial highlights contain selected data
for a Class C share of beneficial interest outstanding, total return, ratios to
average net assets and other supplemental data for the periods indicated. This
information is based on data contained in the financial statements. Further
performance information is contained in the annual report, which may be obtained
without charge. See "Shareholder Guide--Shareholder Services--Reports to
Shareholders."
    
 
   


                                                            CLASS C
                                ----------------------------------------------------------------
                                                                                      AUGUST 1,
                                                                                       1994 (a)
                                             YEAR ENDED AUGUST 31,                     THROUGH
                                -----------------------------------------------       AUGUST 31,
                                  1998         1997         1996         1995            1994
                                --------     --------     --------     --------       ----------
                                                                       
PER SHARE OPERATING
 PERFORMANCE:
Net asset value, beginning of
  period......................  $  11.00     $  10.75     $  10.67     $  10.67         $10.70
                                --------     --------     --------     --------       ----------
INCOME FROM INVESTMENT
  OPERATIONS
Net investment income.........       .41          .42(d)       .44(d)       .47(d)         .05
Net realized and unrealized
  gain (loss) on investment
  transactions................       .40          .39          .08          .10           (.03)
                                --------     --------     --------     --------       ----------
Total from investment
  operations..................       .81          .81          .52          .57            .02
                                --------     --------     --------     --------       ----------
LESS DISTRIBUTIONS
Dividends from net investment
  income......................      (.41)        (.42)        (.44)        (.47)          (.05)
Distributions paid in excess
  of net investment income....        --(e)      (.01)          --           --             --
Distributions from net
  realized gains..............      (.04)        (.13)          --         (.10)            --
                                --------     --------     --------     --------       ----------
Total distributions...........      (.45)        (.56)        (.44)        (.57)          (.05)
                                --------     --------     --------     --------       ----------
Net asset value, end of
  period......................  $  11.36     $  11.00     $  10.75     $  10.67         $10.67
                                --------     --------     --------     --------       ----------
                                --------     --------     --------     --------       ----------
TOTAL RETURN (c):.............      7.41%        7.68%        4.90%        5.62%           .07%
RATIOS/SUPPLEMENTAL DATA:
Net assets, end of period
  (000).......................  $    123     $     68     $     47     $     52         $  102
Average net assets (000)......  $     91     $     49     $     43     $     58         $   31
Ratios to average net assets:
  Expenses, including
   distribution fees..........      1.83%        1.77%(d)     1.75%(d)     1.82%(d)       2.21%(b)
  Expenses, excluding
   distribution fees..........      1.09%        1.02%(d)     1.00%(d)     1.07%(d)       1.47%(b)
  Net investment income.......      3.65%        3.72%(d)     4.05%(d)     4.55%(d)       4.75%(b)
Portfolio turnover rate.......        34%          30%          42%          49%            40%

    
 
- -------------
 
  (a)  Commencement of offering of Class C shares.
 
  (b)  Annualized.
 
  (c)  Total return does not consider the effects of sales loads. Total return
       is calculated assuming a purchase of shares on the first day and a sale
       on the last day of each period reported and includes reinvestment of
       dividends and distributions. Total returns for periods of less than a
       full year are not annualized.
 
   
  (d)  Net of management fee waiver. Effective September 1, 1997, PIFM
       eliminated its management fee waiver (.05 of 1%).
    
 
   
  (e)  Less than $.005 per share.
    
 
                                       7

                              HOW THE FUND INVESTS
 
INVESTMENT OBJECTIVE AND POLICIES
 
  PRUDENTIAL MUNICIPAL SERIES FUND (THE FUND) IS AN OPEN-END, MANAGEMENT
INVESTMENT COMPANY, OR MUTUAL FUND, CONSISTING OF THIRTEEN SEPARATE SERIES. EACH
OF THESE SERIES IS MANAGED INDEPENDENTLY. THE MARYLAND SERIES (THE SERIES) IS
DIVERSIFIED AND ITS INVESTMENT OBJECTIVE IS TO MAXIMIZE CURRENT INCOME THAT IS
EXEMPT FROM MARYLAND STATE AND FEDERAL INCOME TAXES CONSISTENT WITH THE
PRESERVATION OF CAPITAL AND, IN CONJUNCTION THEREWITH, THE SERIES MAY INVEST IN
DEBT SECURITIES WITH THE POTENTIAL FOR CAPITAL GAIN. See "Investment Objectives
and Policies" in the Statement of Additional Information.
 
  THE SERIES' INVESTMENT OBJECTIVE IS A FUNDAMENTAL POLICY AND, THEREFORE, MAY
NOT BE CHANGED WITHOUT THE APPROVAL OF THE HOLDERS OF A MAJORITY OF THE SERIES'
OUTSTANDING VOTING SECURITIES AS DEFINED IN THE INVESTMENT COMPANY ACT OF 1940,
AS AMENDED (THE INVESTMENT COMPANY ACT). THE SERIES' POLICIES THAT ARE NOT
FUNDAMENTAL MAY BE MODIFIED BY THE TRUSTEES.
 
  THE SERIES WILL INVEST PRIMARILY IN MARYLAND STATE, MUNICIPAL AND LOCAL
GOVERNMENT OBLIGATIONS AND OBLIGATIONS OF OTHER QUALIFYING ISSUERS, SUCH AS
ISSUERS LOCATED IN PUERTO RICO, THE VIRGIN ISLANDS AND GUAM, WHICH PAY INCOME
EXEMPT, IN THE OPINION OF COUNSEL, FROM MARYLAND STATE AND FEDERAL INCOME TAXES
(MARYLAND OBLIGATIONS). THERE CAN BE NO ASSURANCE THAT THE SERIES WILL BE ABLE
TO ACHIEVE ITS INVESTMENT OBJECTIVE.
 
  As with an investment in any mutual fund, an investment in this Series can
decrease and you can lose money.
 
   
  Interest on certain municipal obligations may be a preference item for
purposes of the federal alternative minimum tax. The Series may invest without
limit in municipal obligations that are private activity bonds (as defined in
the Internal Revenue Code) the interest on which would be a preference item for
purposes of the federal alternative minimum tax (AMT bonds). See "Taxes,
Dividends and Distributions." Under Maryland law, dividends paid by the Series
are exempt from Maryland personal income tax for resident individuals to the
extent they are derived from interest payments on and, in some cases, gain from
the sale of Maryland Obligations, provided, however, that up to 50% of dividends
attributable to interest received by the Series on AMT bonds could be subject to
Maryland individual income tax. Maryland Obligations could include general
obligation bonds of the State, counties, cities, towns, etc., revenue bonds of
utility systems, highways, bridges, port and airport facilities, colleges,
hospitals, etc., and industrial development and pollution control bonds. The
Series will invest in long-term obligations, and the dollar-weighted average
maturity of the Series' portfolio will generally range between 10-20 years. The
Series also may invest in certain short-term, tax-exempt notes such as Tax
Anticipation Notes, Revenue Anticipation Notes, Bond Anticipation Notes,
Construction Loan Notes and variable and floating rate demand notes.
    
 
   
  Generally, municipal obligations with longer maturities produce higher yields
and are subject to greater price fluctuations as a result of changes in interest
rates (market risk) than municipal obligations with shorter maturities. The
prices of municipal obligations vary inversely with interest rates. Interest
rates are currently much lower than in recent years. As a general matter, bond
prices and the Series' NAV will vary inversely with interest rate fluctuations.
If rates were to rise sharply, the prices of bonds in the Series' portfolio
might be adversely affected.
    
 
  THE SERIES MAY INVEST ITS ASSETS IN FLOATING RATE AND VARIABLE RATE
SECURITIES, INCLUDING PARTICIPATION INTERESTS THEREIN AND INVERSE FLOATERS.There
is no limit on the amount of such securities that the Series may purchase.
Floating rate securities normally have a rate of interest which is set as a
specific percentage of a designated base rate, such as the rate on Treasury
bonds or bills or the prime rate at a major commercial bank. The interest rate
on floating rate securities changes periodically when there is a change in the
designated base interest rate. Variable rate securities provide for a specified
periodic adjustment in the interest rate based on prevailing market rates and
generally would allow the Series to demand payment of the obligation on short
notice at par plus accrued interest, which amount may be more or less than the
amount the Series paid for
 
                                       8

them. An inverse floater is a debt instrument with a floating or variable
interest rate that moves in the opposite direction of the interest rate on
another security or the value of an index. Changes in the interest rate on the
other security or index inversely affect the residual interest rate paid on the
inverse floater, with the result that the inverse floater's price will be
considerably more volatile than that of a fixed rate bond. The market for
inverse floaters is relatively new.
 
  THE SERIES MAY ALSO INVEST IN MUNICIPAL LEASE OBLIGATIONS. A MUNICIPAL LEASE
OBLIGATION IS A MUNICIPAL SECURITY THE INTEREST ON AND PRINCIPAL OF WHICH IS
PAYABLE OUT OF LEASE PAYMENTS MADE BY THE PARTY LEASING THE FACILITIES FINANCED
BY THE ISSUE. Typically, municipal lease obligations are issued by a state or
municipal financing authority to provide funds for the construction of
facilities (E.G., schools, dormitories, office buildings or prisons) or the
acquisition of equipment. The facilities are typically used by the state or
municipality pursuant to a lease with a financing authority. Certain municipal
lease obligations may trade infrequently. Accordingly, the investment adviser
will monitor the liquidity of municipal lease obligations under the supervision
of the Trustees. Municipal lease obligations will not be considered illiquid for
purposes of the Series' 15% limitation on illiquid securities provided the
investment adviser determines that there is a readily available market for such
securities. See "Other Investments and Policies--Illiquid Securities" below.
 
   
  THE SERIES WILL INVEST AT LEAST 70% OF ITS TOTAL ASSETS IN MARYLAND
OBLIGATIONS WHICH, AT THE TIME OF PURCHASE, ARE RATED WITHIN THE FOUR HIGHEST
QUALITY GRADES AS DETERMINED BY MOODY'S INVESTORS SERVICE (MOODY'S) (CURRENTLY
Aaa, Aa, A, Baa FOR BONDS, MIG 1, MIG 2, MIG 3, MIG 4 FOR NOTES AND PRIME-1 FOR
COMMERCIAL PAPER), STANDARD & POOR'S RATINGS GROUP (S&P) (CURRENTLY AAA, AA, A,
BBB FOR BONDS, SP-1, SP-2 FOR NOTES AND A-1 FOR COMMERCIAL PAPER) OR ANOTHER
NATIONALLY RECOGNIZED STATISTICAL RATING ORGANIZATION (NRSRO) OR, IF UNRATED,
WILL POSSESS CREDITWORTHINESS, IN THE OPINION OF THE INVESTMENT ADVISER,
COMPARABLE TO SUCH INVESTMENT GRADE RATED SECURITIES.
    
 
   
  THE SERIES MAY ALSO INVEST UP TO 30% OF ITS TOTAL ASSETS IN MARYLAND
OBLIGATIONS RATED BELOW Baa BY MOODY'S OR BELOW BBB BY S&P, OR A COMPARABLE
RATING OF ANOTHER NRSRO OR, IF NON-RATED, OF COMPARABLE QUALITY, IN THE OPINION
OF THE FUND'S INVESTMENT ADVISER, BASED ON ITS CREDIT ANALYSIS. Securities rated
Baa by Moody's and BBB by S&P are described as being investment grade but are
also characterized as having speculative characteristics. Securities rated below
Baa by Moody's and below BBB by S&P are considered speculative. See "Description
of Security Ratings" in the Appendix. Such lower-rated high yield securities are
commonly referred to as junk bonds. Such securities generally offer a higher
current yield than those in the higher rating categories but may also involve
greater price volatility and risk of loss of principal and income. The
investment adviser will attempt to manage risk and enhance yield through credit
analysis and careful security selection. See "Risk Factors Relating to Investing
in High Yield Municipal Obligations" below. Subsequent to its purchase by the
Series, a municipal obligation may be assigned a lower rating or cease to be
rated. Such an event would not require the elimination of the issue from the
portfolio, but the investment adviser will consider such an event in determining
whether the Series should continue to hold the security in its portfolio. Many
issuers of lower-quality bonds choose not to have their obligations rated and
the Series may invest in such unrated securities. Investors should carefully
consider the relative risks associated with investments in securities which
carry lower ratings and in comparable non-rated securities.
    
 
   
  During the year ended August 31, 1998, the monthly dollar weighted average
ratings of the debt obligations held by the Series, expressed as a percentage of
the Series' total assets, were as follows:
    
 
   


                                                                                 PERCENTAGE OF
RATINGS                                                                        TOTAL INVESTMENTS
- -----------------------------------------------------------------------------  -----------------
                                                                            
AAA/Aaa......................................................................          42.49%
AA/Aa........................................................................          13.29%
A/A..........................................................................          14.50%
BBB/Baa......................................................................          24.40%
Unrated
  BBB/Baa....................................................................           4.47%
  B/B........................................................................            .84%

    
 
                                       9

  From time to time, the Series may own the majority of a municipal issue. Such
majority-owned holdings may present market and credit risks.
 
  The Series may purchase Maryland Obligations which, in the opinion of the
investment adviser, offer the opportunity for capital appreciation. This may
occur, for example, when the investment adviser believes that the issuer of a
particular Maryland Obligation might receive an upgraded credit standing,
thereby increasing the market value of the bonds it has issued or when the
investment adviser believes that interest rates might decline.
 
  UNDER NORMAL MARKET CONDITIONS, THE SERIES WILL ATTEMPT TO INVEST
SUBSTANTIALLY ALL OF THE VALUE OF ITS ASSETS IN MARYLAND OBLIGATIONS. As a
matter of fundamental policy, during normal market conditions the Series' assets
will be invested so that at least 80% of the income will be exempt from Maryland
State and federal income taxes or the Series will have at least 80% of its total
assets invested in Maryland Obligations. During abnormal market conditions or to
provide liquidity, the Series may hold cash or cash equivalents or investment
grade taxable obligations, including obligations that are exempt from federal,
but not state, taxation and the Series may invest in tax-free cash equivalents,
such as floating rate demand notes, tax-exempt commercial paper and general
obligation and revenue notes or in taxable cash equivalents, such as
certificates of deposit, bankers acceptances and time deposits or other
short-term taxable investments such as repurchase agreements. When, in the
opinion of the investment adviser, abnormal market conditions require a
temporary defensive position, the Series may invest more than 20% of the value
of its assets in debt securities other than Maryland Obligations or may invest
its assets so that more than 20% of the income is subject to Maryland State or
federal income taxes. The Series will treat an investment in a municipal bond
refunded with escrowed U.S. Government securities as U.S. Government securities
for purposes of the Investment Company Act's diversification requirements
provided certain conditions are met. See "Investment Objectives and Policies--In
General" in the Statement of Additional Information.
 
   
  THE SERIES MAY ACQUIRE PUT OPTIONS (PUTS) GIVING THE SERIES THE RIGHT TO SELL
SECURITIES HELD IN THE SERIES' PORTFOLIO AT A SPECIFIED EXERCISE PRICE ON A
SPECIFIED DATE. Such puts may be acquired for the purpose of protecting the
Series from a possible decline in the market value of the security to which the
put applies in the event of interest rate fluctuations or, in the case of
liquidity puts, for the purpose of shortening the effective maturity of the
underlying security. The aggregate value of premiums paid to acquire puts held
in the Series' portfolio (other than liquidity puts) may not exceed 10% of the
NAV of the Series. The acquisition of a put may involve an additional cost to
the Series by payment of a premium for the put, by payment of a higher purchase
price for securities to which the put is attached or through a lower effective
interest rate.
    
 
  In addition, there is a credit risk associated with the purchase of puts in
that the issuer of the put may be unable to meet its obligation to purchase the
underlying security. Accordingly, the Series will acquire puts only under the
following circumstances: (1) the put is written by the issuer of the underlying
security and such security is rated within the four highest quality grades as
determined by an NRSRO; or (2) the put is written by a person other than the
issuer of the underlying security and such person has securities outstanding
which are rated within such four highest quality grades; or (3) the put is
backed by a letter of credit or similar financial guarantee issued by a person
having securities outstanding which are rated within the two highest quality
grades of an NRSRO.
 
   
  THE SERIES MAY PURCHASE MUNICIPAL OBLIGATIONS ON A WHEN-ISSUED OR DELAYED
DELIVERY BASIS, IN EACH CASE WITHOUT LIMIT. When municipal obligations are
offered on a when-issued or delayed delivery basis, the price and coupon rate
are fixed at the time the commitment to purchase is made, but delivery and
payment for the securities take place at a later date. During the period between
purchase and settlement, no interest accrues to the economic benefit of the
purchaser. In the case of purchases by the Series, the price that the Series is
required to pay on the settlement date may be in excess of the market value of
the municipal obligations on that date. While securities may be sold prior to
the settlement date, the Series intends to purchase these securities with the
purpose of actually acquiring them unless a sale would be desirable for
investment reasons. At the time the Series makes the commitment to purchase a
municipal obligation on a when-issued or delayed delivery basis, it will record
the transaction and reflect the value of the obligation each day in determining
its NAV. This value may fluctuate from day to day in the same manner as
    
 
                                       10

   
values of municipal obligations otherwise held by the Series. If the seller
defaults in the sale, the Series could fail to realize the appreciation, if any,
that had occurred. The Series will establish a segregated account in which it
will maintain cash or other liquid assets, equal or greater in value to its
commitments for when-issued or delayed delivery securities.
    
 
  THE SERIES MAY ALSO PURCHASE MUNICIPAL FORWARD CONTRACTS. A municipal forward
contract is a municipal security which is purchased on a when-issued basis with
delivery taking place up to five years from the date of purchase. No interest
will accrue on the security prior to the delivery date. The investment adviser
will monitor the liquidity, value, credit quality and delivery of the security
under the supervision of the Trustees.
 
  THE SERIES MAY PURCHASE SECONDARY MARKET INSURANCE ON MARYLAND OBLIGATIONS
WHICH IT HOLDS OR ACQUIRES. Secondary market insurance would be reflected in the
market value of the municipal obligation purchased and may enable the Series to
dispose of a defaulted obligation at a price similar to that of comparable
municipal obligations which are not in default.
 
   
  Insurance is not a substitute for the basic credit of an issuer, but
supplements the existing credit and provides additional security therefor. While
insurance coverage for the Maryland Obligations held by the Series reduces
credit risk by providing that the insurance company will make timely payment of
principal and interest if the issuer defaults on its obligation to make such
payment, it does not afford protection against fluctuation in the price, I.E.,
the market value, of the municipal obligations caused by changes in interest
rates and other factors, nor in turn against fluctuations in the NAV of the
shares of the Series.
    
 
   
  RISK FACTORS RELATING TO INVESTING IN HIGH YIELD MUNICIPAL
OBLIGATIONS. FIXED-INCOME SECURITIES ARE SUBJECT TO THE RISK OF AN ISSUER'S
INABILITY TO MEET PRINCIPAL AND INTEREST PAYMENTS ON THE OBLIGATIONS (CREDIT
RISK) AND MAY ALSO BE SUBJECT TO PRICE VOLATILITY DUE TO SUCH FACTORS AS
INTEREST RATE SENSITIVITY, MARKET PERCEPTION OF THE CREDITWORTHINESS OF THE
ISSUER AND GENERAL MARKET LIQUIDITY (MARKET RISK). Lower-rated or unrated (I.E.,
high yield) securities, commonly known as junk bonds, are more likely to react
to developments affecting market and credit risk than are more highly rated
securities, which react primarily to movements in the general level of interest
rates. The investment adviser will perform its own investment analysis and will
not rely principally on the ratings assigned by the rating services, although
such ratings will be considered by the investment adviser. The investment
adviser will consider, among other things, credit risk and market risk, as well
as the financial history and condition, the prospects and the management of an
issuer in selecting securities for the Series' portfolio. The achievement of the
Series' investment objective may be more dependent on the investment adviser's
credit analysis than is the case when investing in only higher quality bonds.
Investors should carefully consider the relative risks of investing in high
yield municipal obligations and understand that such securities are not
generally meant for short-term investing and that yields on junk bonds will
fluctuate over time.
    
 
   
  The amount of high yield securities outstanding has proliferated recently in
conjunction with the decline in creditworthiness of many obligors on municipal
debt, particularly health care providers and certain governmental bodies. An
economic downturn could severely affect the ability of highly leveraged issuers
to service their debt obligations or to repay their obligations upon maturity.
Furthermore, changes in economic conditions and other circumstances are more
likely to lead to a weakened capacity to make principal and interest payments
than in the case of higher grade bonds. In addition, the secondary market for
high yield securities, which is concentrated in relatively few market makers,
may not be as liquid as the secondary market for more highly rated securities
and, from time to time, it may be more difficult to value high yield securities
than more highly rated securities, and the judgment of the Board of Trustees and
investment adviser may play a greater role in valuation because there is less
reliable objective data available. Under adverse market or economic conditions,
the secondary market for high yield securities could contract further,
independent of any specific adverse changes in the condition of a particular
issuer. As a result, the investment adviser could find it more difficult to sell
these securities or may be able to sell the securities only at prices lower than
if such securities were widely traded. Prices realized upon the sale of such
lower rated or unrated securities, under these circumstances, may be less than
the prices used in calculating the Series' NAV. If the investment adviser
becomes involved in activities such as reorganizations of obligors of troubled
investments held by the Series, this may prevent the Series from disposing of
the securities, due to its possession of material, non-public information
concerning the obligor.
    
 
                                       11

   
  LOWER-RATED OR UNRATED DEBT OBLIGATIONS ALSO PRESENT RISKS BASED ON PAYMENT
EXPECTATIONS. If an issuer calls the obligation for redemption, the Series may
have to replace the security with a lower-yielding security, resulting in a
decreased return for investors. If the Series experiences unexpected net
redemptions, it may be forced to sell its higher rated securities, resulting in
a decline in the overall credit quality of the portfolio and increasing the
exposure of the Series to the risks of high yield securities.
    
 
  FUTURES CONTRACTS AND OPTIONS THEREON
 
   
  THE SERIES IS AUTHORIZED TO PURCHASE AND SELL CERTAIN DERIVATIVES, INCLUDING
FINANCIAL FUTURES CONTRACTS (FUTURES CONTRACTS) AND OPTIONS THEREON FOR THE
PURPOSE OF HEDGING ITS PORTFOLIO SECURITIES AGAINST FLUCTUATIONS IN VALUE CAUSED
BY CHANGES IN PREVAILING MARKET INTEREST RATES AND HEDGING AGAINST INCREASES IN
THE COST OF SECURITIES THE SERIES INTENDS TO PURCHASE. THE SUCCESSFUL USE OF
FUTURES CONTRACTS AND OPTIONS THEREON BY THE SERIES INVOLVES ADDITIONAL
TRANSACTION COSTS, IS SUBJECT TO VARIOUS RISKS AND DEPENDS UPON THE INVESTMENT
ADVISER'S ABILITY TO PREDICT THE DIRECTION OF THE MARKET (INCLUDING INTEREST
RATES). THE SERIES, AND THUS INVESTORS, MAY LOSE MONEY THROUGH ANY UNSUCCESSFUL
USE OF THESE STRATEGIES.
    
 
  A FUTURES CONTRACT OBLIGATES THE SELLER OF THE CONTRACT TO DELIVER TO THE
PURCHASER OF THE CONTRACT CASH EQUAL TO A SPECIFIC DOLLAR AMOUNT TIMES THE
DIFFERENCE BETWEEN THE VALUE OF A SPECIFIC FIXED-INCOME SECURITY OR INDEX AT THE
CLOSE OF THE LAST TRADING DAY OF THE CONTRACT AND THE PRICE AT WHICH THE
AGREEMENT IS MADE. No physical delivery of the underlying securities is made.
The Series will engage in transactions in only those futures contracts and
options thereon that are traded on a commodities exchange or a board of trade.
 
   
  THE SERIES INTENDS TO ENGAGE IN FUTURES CONTRACTS AND OPTIONS THEREON AS A
HEDGE AGAINST CHANGES, RESULTING FROM MARKET CONDITIONS, IN THE VALUE OF
SECURITIES WHICH ARE HELD IN THE SERIES' PORTFOLIO OR WHICH THE SERIES INTENDS
TO PURCHASE, IN ACCORDANCE WITH THE RULES AND REGULATIONS OF THE COMMODITY
FUTURES TRADING COMMISSION (CFTC). The Series also intends to engage in such
transactions when they are economically appropriate for the reduction of risks
inherent in the ongoing management of the Series.
    
 
   
  THE SERIES MAY NOT PURCHASE OR SELL FUTURES CONTRACTS OR OPTIONS THEREON IF,
IMMEDIATELY THEREAFTER, (I) THE SUM OF INITIAL AND NET CUMULATIVE VARIATION
MARGIN ON OUTSTANDING FUTURES CONTRACTS, TOGETHER WITH PREMIUMS PAID FOR OPTIONS
THEREON, WOULD EXCEED 20% OF THE TOTAL ASSETS OF THE SERIES, OR (II) IN THE CASE
OF RISK MANAGEMENT TRANSACTIONS, THE SUM OF THE AMOUNT OF INITIAL MARGIN
DEPOSITS ON THE SERIES' FUTURES POSITIONS AND PREMIUMS PAID FOR OPTIONS THEREON
WOULD EXCEED 5% OF THE LIQUIDATION VALUE OF THE SERIES' TOTAL ASSETS. There are
no limitations on the percentage of the portfolio which may be hedged and no
limitations on the use of the Series' assets to cover futures contracts and
options thereon, except that the aggregate value of the obligations underlying
put options will not exceed 50% of the Series' assets.
    
 
  Currently, futures contracts are available on several types of fixed-income
securities, including U.S. Treasury bonds and notes, three-month U.S. Treasury
bills and Eurodollars. Futures contracts are also available on a municipal bond
index, based on THE BOND BUYER Municipal Bond Index, an index of 40 actively
traded municipal bonds. The Series may also engage in transactions in other
futures contracts that become available, from time to time, in other
fixed-income securities or municipal bond indices and in other options on such
contracts if the investment adviser believes such contracts and options would be
appropriate for hedging the Series' portfolio.
 
  THERE CAN BE NO ASSURANCE THAT VIABLE MARKETS WILL CONTINUE OR THAT A LIQUID
SECONDARY MARKET WILL EXIST TO TERMINATE ANY PARTICULAR FUTURES CONTRACT AT ANY
SPECIFIC TIME. If it is not possible to close a futures position entered into by
the Series, the Series will continue to be required to make daily cash payments
of variation margin in the event of adverse price movements. In such a
situation, if the Series had insufficient cash, it might have to sell portfolio
securities to meet daily variation margin requirements at a time when it might
be disadvantageous to do so. The inability to close futures positions also could
have an adverse impact on the ability of the Series to hedge effectively. There
is also a risk of loss by the Series of margin deposits in the event of
bankruptcy of a broker with whom the Series has an open position in a futures
contract.
 
                                       12

  THE SUCCESSFUL USE OF FUTURES CONTRACTS AND OPTIONS THEREON BY THE SERIES IS
SUBJECT TO VARIOUS ADDITIONAL RISKS. Any use of futures transactions involves
the risk of imperfect correlation in movements in the price of futures contracts
and movements in interest rates and, in turn, the prices of the securities that
are the subject of the hedge. If the price of the futures contract moves more or
less than the price of the security that is the subject of the hedge, the Series
will experience a gain or loss that will not be completely offset by movements
in the price of the security. The risk of imperfect correlation is greater where
the securities underlying futures contracts are taxable securities (rather than
municipal securities), are issued by companies in different market sectors or
have different maturities, ratings or geographic mixes than the security being
hedged. In addition, the correlation may be affected by additions to or
deletions from the index which serves as the basis for a futures contract.
Finally, if the price of the security that is subject to the hedge were to move
in a favorable direction, the advantage to the Series would be partially offset
by the loss incurred on the futures contract.
 
  SPECIAL CONSIDERATIONS
 
   
  BECAUSE THE SERIES WILL INVEST AT LEAST 80% OF THE VALUE OF ITS TOTAL ASSETS
IN MARYLAND OBLIGATIONS AND BECAUSE IT SEEKS TO MAXIMIZE INCOME DERIVED FROM
MARYLAND OBLIGATIONS, IT IS MORE SUSCEPTIBLE TO FACTORS ADVERSELY AFFECTING
ISSUERS OF MARYLAND OBLIGATIONS THAN IS A COMPARABLE MUNICIPAL BOND MUTUAL FUND
THAT IS NOT CONCENTRATED IN SUCH OBLIGATIONS TO THIS DEGREE. During the three
fiscal years from 1991 through 1993, the State's finances were severely affected
by the national recession. Nevertheless, the State closed fiscal year 1993 with
a $10.5 million operating surplus on a budgetary basis and closed fiscal year
1994 with a $60 million operating surplus on a budgetary basis. On a GAAP basis,
the State's General Fund moved from a deficit of $121.7 million as of June 30,
1993 to a positive balance of $113.9 million on June 30, 1994. Financial
operations continued to improve in fiscal year 1995, with revenues exceeding
estimates by $217 million and expenditures at $184 million above budget.
Estimates for 1996 General Fund revenues were revised downward by $148 million,
compared to projections made in the enacted budget; nevertheless, the State
closed fiscal year 1996 with a General Fund balance on a budgetary basis of
$13.1 million and $461.2 million in the Revenue Stabilization Account of the
State Reserve Fund. The State had a General Fund balance for fiscal 1997 on a
budgetary basis of $144.5 million and $490.4 million in the Revenue
Stabilization Account of the State Reserve Fund. The enacted 1997 budget held
overall appropriations to slightly over 1996 levels, reflecting slowed revenue
growth and the absence of an appropriation to the now fully funded Revenue
Stabilization Account of the State Reserve Fund.
    
 
   
  In April 1997 the General Assembly approved a $15.4 billion 1998 fiscal year
budget. This budget (i) includes funds sufficient to meet all specific statutory
funding requirements; (ii) incorporates the first year of a five-year phase-in
of a 10% reduction in personal income taxes (estimated to reduce revenues by
$38.5 million in fiscal year 1998 and $450 million when fully phased in) and
certain reductions in sales taxes on certain manufacturing equipment (estimated
to reduce revenues by $38.6 million when the reductions are fully phased in
fiscal year 2001); and (iii) includes the first year's $30 million funding under
an agreement to provide additional funds totaling $230 million over a five-year
period to schools in the City of Baltimore and related grants to other
subdivisions totaling $32 million. As of July, 1998, the State projected ending
fiscal year 1998 with a General Fund balance on a budgetary basis of $317.2
million and $617 million in the Revenue Stabilization Account of the State
Reserve Fund.
    
 
  Other issuers of Maryland Obligations are subject to various risks and
uncertainties, and the credit quality of the securities issued by them may vary
considerably from the credit quality of obligations issued by the State. If
either the State or any of its local governmental entities is unable to meet its
financial obligations, the income derived by the Series, the ability to preserve
or realize appreciation of the Series' capital and the Series' liquidity could
be adversely affected. See "Investment Objectives and Policies--Special
Considerations Regarding Investments in Tax-Exempt Securities" in the Statement
of Additional Information.
 
                                       13

OTHER INVESTMENTS AND POLICIES
 
  REPURCHASE AGREEMENTS
 
   
  The Series may on occasion enter into repurchase agreements whereby the seller
of a security agrees to repurchase that security from the Series at a mutually
agreed-upon time and price. The period of maturity is usually quite short,
possibly overnight or a few days, although it may extend over a number of
months. The resale price is in excess of the purchase price, reflecting an
agreed-upon rate of return effective for the period of time the Series' money is
invested in the repurchase agreement. The Series' repurchase agreements will at
all times be fully collateralized in an amount at least equal to the resale
price. The instruments held as collateral are valued daily and if the value of
the instruments declines, the Series will require additional collateral. If the
seller defaults and the value of the collateral securing the repurchase
agreement declines, the Series may incur a loss. The Series participates in a
joint repurchase account with other investment companies managed by PIFM
pursuant to an order of the Commission.
    
 
  BORROWING
 
  The Series may borrow an amount equal to no more than 33 1/3% of the value of
its total assets (calculated when the loan is made) for temporary, extraordinary
or emergency purposes or for the clearance of transactions. The Series may
pledge up to 33 1/3% of the value of its total assets to secure these
borrowings. The Series will not purchase portfolio securities if its borrowings
exceed 5% of its total assets.
 
  PORTFOLIO TURNOVER
 
   
  The Series does not expect to trade in securities for short-term gain. It is
anticipated that the annual portfolio turnover rate will not exceed 150%. The
portfolio turnover rate is calculated by dividing the lesser of sales or
purchases of portfolio securities by the average monthly value of the portfolio
securities, excluding securities having a maturity at the date of purchase of
one year or less. High portfolio turnover of a Series may involve
correspondingly greater brokerage commissions and other transaction costs, which
will be borne directly by that Series. In addition, high portfolio turnover may
result in increased short-term capital gains, which, when distributed to
shareholders, are treated as ordinary income. See "Taxes, Dividends and
Distributions."
    
 
  ILLIQUID SECURITIES
 
   
  The Series may hold up to 15% of its net assets in illiquid securities
including repurchase agreements which have a maturity of longer than seven days,
securities with legal or contractual restrictions on resale (restricted
securities) and securities that are not readily marketable. Securities,
including restricted securities eligible for resale pursuant to Rule 144A under
the Securities Act of 1933, as amended (the Securities Act), privately placed
commercial paper and municipal lease obligations, that have a readily available
market are not considered illiquid for the purposes of this limitation. The
investment adviser will monitor the liquidity of such restricted securities
under the supervision of the Trustees. The Series' investment in Rule 144A
securities could have the effect of increasing illiquidity to the extent that
qualified institutional buyers become, for a limited time, uninterested in
purchasing Rule 144A securities. See "Investment Objectives and
Policies--Illiquid Securities" and "Investment Restrictions" in the Statement of
Additional Information. Repurchase agreements subject to demand are deemed to
have a maturity equal to the notice period.
    
 
INVESTMENT RESTRICTIONS
 
  The Series is subject to certain investment restrictions which, like its
investment objective, constitute fundamental policies. Fundamental policies
cannot be changed without the approval of the holders of a majority of the
Series' outstanding voting securities, as defined in the Investment Company Act.
See "Investment Restrictions" in the Statement of Additional Information.
 
                                       14

                            HOW THE FUND IS MANAGED
 
  THE FUND HAS TRUSTEES WHO, IN ADDITION TO OVERSEEING THE ACTIONS OF THE FUND'S
MANAGER, SUBADVISER AND DISTRIBUTOR, AS SET FORTH BELOW, DECIDE UPON MATTERS OF
GENERAL POLICY. THE FUND'S MANAGER CONDUCTS AND SUPERVISES THE DAILY BUSINESS
OPERATIONS OF THE FUND. THE FUND'S SUBADVISER FURNISHES DAILY INVESTMENT
ADVISORY SERVICES.
 
   
  For the fiscal year ended August 31, 1998, total expenses of the Series as a
percentage of average net assets were 1.19%, 1.58% and 1.83% for the Series'
Class A, Class B and Class C shares, respectively. See "Financial Highlights."
    
 
MANAGER
 
   
  PRUDENTIAL INVESTMENTS FUND MANAGEMENT LLC (PIFM OR THE MANAGER), GATEWAY
CENTER THREE, 100 MULBERRY STREET, NEWARK, NEW JERSEY 07102-4077, IS THE MANAGER
OF THE FUND AND IS COMPENSATED FOR ITS SERVICES AT AN ANNUAL RATE OF .50 OF 1%
OF THE AVERAGE DAILY NET ASSETS OF THE SERIES. PIFM is organized in New York as
a limited liability company. For the fiscal year ended August 31, 1998, the
Series paid PIFM a management fee of .50 of 1% of the Series' average net
assets. See "Fee Waivers and Subsidy" below and "Manager" in Statement of
Additional Information.
    
 
   
  As of September 30, 1998, PIFM served as the manager to 44 open-end investment
companies, constituting all of the Prudential Mutual Funds, and as manager or
administrator to 22 closed-end investment companies with aggregate assets of
approximately $67 billion.
    
 
  UNDER THE MANAGEMENT AGREEMENT WITH THE FUND, PIFM MANAGES THE INVESTMENT
OPERATIONS OF EACH SERIES OF THE FUND AND ALSO ADMINISTERS THE FUND'S BUSINESS
AFFAIRS. See "Manager" in the Statement of Additional Information.
 
   
  UNDER A SUBADVISORY AGREEMENT BETWEEN PIFM AND THE PRUDENTIAL INVESTMENT
CORPORATION (PIC, THE SUBADVISER OR THE INVESTMENT ADVISER), THE SUBADVISER
FURNISHES INVESTMENT ADVISORY SERVICES IN CONNECTION WITH THE MANAGEMENT OF THE
FUND AND IS REIMBURSED BY PIFM FOR ITS REASONABLE COSTS AND EXPENSES INCURRED IN
PROVIDING SUCH SERVICE. PIC's address is Prudential Plaza, Newark, New Jersey
07102-3777. Under the Management Agreement, PIFM continues to have
responsibility for all investment advisory services and supervises the
Subadviser's performance of such services.
    
 
  The current portfolio manager of the Series is James M. Murphy. Mr. Murphy has
responsibility for the day-to-day management of the portfolio. He has managed
the portfolio since January 1997 and has been employed by PIC in various
capacities since 1989.
 
  PIFM and PIC are indirect, wholly-owned subsidiaries of The Prudential
Insurance Company of America (Prudential), a major diversified insurance and
financial services company, and are part of Prudential Investments, a business
group of Prudential.
 
   
FEE WAIVERS AND SUBSIDY
    
 
   
  PIFM may from time to time agree to waive all or a portion of its management
fee and subsidize all or a portion of the operating expenses of the Series. Fee
waivers and expense subsidies will increase the Series' yield and total return.
The Series is not required to reimburse PIFM for such management fee waiver. See
"Performance Information" in the Statement of Additional Information and "Fund
Expenses."
    
 
DISTRIBUTOR
 
   
  PRUDENTIAL INVESTMENT MANAGEMENT SERVICES LLC (THE DISTRIBUTOR), GATEWAY
CENTER THREE, 100 MULBERRY STREET, NEWARK, NEW JERSEY 07102-4077, IS A LIMITED
LIABILITY COMPANY ORGANIZED UNDER THE LAWS OF THE STATE OF DELAWARE
    
 
                                       15

   
AND SERVES AS THE DISTRIBUTOR OF THE SHARES OF THE SERIES. IT IS A WHOLLY-OWNED
SUBSIDIARY OF PRUDENTIAL. Prudential Securities Incorporated (Prudential
Securities), One Seaport Plaza, New York, New York 10292, previously served as
distributor of the Series' shares. It is an indirect, wholly-owned subsidiary of
Prudential.
    
 
   
  UNDER SEPARATE DISTRIBUTION AND SERVICE PLANS (THE CLASS A PLAN, THE CLASS B
PLAN AND THE CLASS C PLAN, COLLECTIVELY, THE PLANS) ADOPTED BY THE FUND UNDER
RULE 12B-1 UNDER THE INVESTMENT COMPANY ACT AND A DISTRIBUTION AGREEMENT (THE
DISTRIBUTION AGREEMENT), THE DISTRIBUTOR INCURS THE EXPENSES OF DISTRIBUTING THE
CLASS A, CLASS B AND CLASS C SHARES OF THE SERIES. These expenses include
commissions and account servicing fees paid to, or on account of, Dealers or
financial institutions which have entered into agreements with the Distributor,
advertising expenses, the cost of printing and mailing prospectuses to potential
investors and indirect and overhead costs of the Distributor associated with the
sale of Series shares, including lease, utility, communications and sales
promotion expenses. Certain Dealers are paid higher fees than others with
respect to Class A shares pursuant to separate agreements with the Distributor.
    
 
  Under the Plans, the Series is obligated to pay distribution and/or service
fees to the Distributor as compensation for its distribution and service
activities, not as reimbursement for specific expenses incurred. If the
Distributor's expenses exceed its distribution and service fees, the Series will
not be obligated to pay any additional expenses. If the Distributor's expenses
are less than such distribution and service fees, it will retain its full fees
and realize a profit.
 
   
  The distribution and/or service fees may also be used by the Distributor to
compensate on a continuing basis Dealers in consideration for the distribution,
marketing, administrative and other services and activities provided by Dealers
with respect to the promotion of the sale of the Series' shares and the
maintenance of related shareholder accounts.
    
 
   
  UNDER THE CLASS A PLAN, THE SERIES MAY PAY THE DISTRIBUTOR FOR ITS
DISTRIBUTION-RELATED ACTIVITIES WITH RESPECT TO CLASS A SHARES AT AN ANNUAL RATE
OF UP TO .30 OF 1% OF THE AVERAGE DAILY NET ASSETS OF THE CLASS A SHARES OF THE
SERIES. The Class A Plan provides that (i) up to .25 of 1% of the average daily
net assets of the Class A shares may be used to pay for personal service and/or
the maintenance of shareholder accounts (service fee) and (ii) total
distribution fees (including the service fee of .25 of 1%) may not exceed .30 of
1% of the average daily net assets of the Class A shares. The Distributor has
voluntarily limited its distribution-related fees payable under the Class A Plan
to .10 of 1% of the average daily net assets of the Class A shares. This
voluntary limitation may be modified or terminated at any time without notice.
    
 
   
  UNDER THE CLASS B AND CLASS C PLANS, THE SERIES MAY PAY THE DISTRIBUTOR FOR
ITS DISTRIBUTION-RELATED ACTIVITIES WITH RESPECT TO CLASS B AND CLASS C SHARES
AT AN ANNUAL RATE OF UP TO .50 OF 1% AND UP TO 1% OF THE AVERAGE DAILY NET
ASSETS OF THE CLASS B AND CLASS C SHARES, RESPECTIVELY. The Class B Plan
provides for the payment to the Distributor of (i) an asset-based sales charge
of up to .50 of 1% of the average daily net assets of the Class B shares, and
(ii) a service fee of up to .25 of 1% of the average daily net assets of the
Class B shares; provided that the total distribution-related fee does not exceed
 .50 of 1%. The Class C Plan provides for the payment to Prudential Securities of
(i) an asset-based sales charge of up to .75 of 1% of the average daily net
assets of the Class B and Class C shares, respectively, and (ii) a service fee
of up to .25 of 1% of the average daily net assets of the Class C shares. The
service fee is used to pay for personal service and/or the maintenance of
shareholder accounts. The Distributor has voluntarily limited its
distribution-related fees payable under the Class B and Class C Plans to .10 of
1% and .25 of 1% of the average daily net assets of the Class B and Class C
shares, respectively. These voluntary limitations may be modified or terminated
at any time without notice. The Distributor also receives CDSC's from certain
redeeming shareholders. See "Shareholder Guide--How to Sell Your
Shares--Contingent Deferred Sales Charges."
    
 
   
  For the fiscal year ended August 31, 1998, the Series paid distribution
expenses of .10 of 1%, .50 of 1% and .75 of 1% of the average daily net assets
of the Class A, Class B and Class C shares, respectively. The Series records all
payments made under the Plans as expenses in the calculation of net investment
income. See "Distributor" in the Statement of Additional Information.
    
 
                                       16

   
  Distribution expenses attributable to the sale of Class A, Class B and Class C
shares of the Series will be allocated to each such class based upon the ratio
of sales of each such class to the sales of Class A, Class B or Class C shares
of the Series other than expenses allocable to a particular class. The
distribution fee and sales charge of one class will not be used to subsidize the
sale of another class.
    
 
   
  Each Plan provides that it shall continue in effect from year to year provided
that a majority of the Trustees of the Fund, including a majority of the
Trustees who are not interested persons of the Fund (as defined in the
Investment Company Act) and who have no direct or indirect financial interest in
the operation of the Plan or any agreement related to the Plan (the Rule 12b-1
Trustees), vote annually to continue the Plan. Each Plan may be terminated with
respect to the Series at any time by vote of a majority of the Rule 12b-1
Trustees or of a majority of the outstanding shares of the applicable class of
the Series. The Series will not be obligated to pay distribution and service
fees incurred under any Plan if it is terminated or not continued.
    
 
   
  In addition to distribution and service fees paid by the Series under the
Class A, Class B and Class C Plans, the Manager (or one of its affiliates) may
make payments out of its own resources to Dealers and other persons which
distribute shares of the Series. Such payments may be calculated by reference to
the NAV of shares sold by such persons or otherwise.
    
 
   
  The Distributor is subject to the rules of the National Association of
Securities Dealers, Inc. (the NASD) governing maximum sales charges. See
"Distributor" in the Statement of Additional Information.
    
 
   
PORTFOLIO TRANSACTIONS
    
 
   
  Affiliates of the Distributor may act as brokers or futures commission
merchants for the Fund, provided that the commissions, fees or other
remuneration they receive are fair and reasonable. See "Portfolio Transactions
and Brokerage" in the Statement of Additional Information.
    
 
CUSTODIAN AND TRANSFER AND DIVIDEND DISBURSING AGENT
 
  State Street Bank and Trust Company, One Heritage Drive, North Quincy,
Massachusetts 02171, serves as Custodian for the portfolio securities of the
Series and cash and, in that capacity, maintains certain financial and
accounting books and records pursuant to an agreement with the Fund. Its mailing
address is P.O. Box 1713, Boston, Massachusetts 02105.
 
   
  Prudential Mutual Fund Services LLC (PMFS or the Transfer Agent), Raritan
Plaza One, Edison, New Jersey 08837, serves as Transfer Agent and Dividend
Disbursing Agent and, in those capacities, maintains certain books and records
for the Fund. PMFS is a wholly-owned subsidiary of PIFM. Its mailing address is
P.O. Box 15005, New Brunswick, New Jersey 08906-5005.
    
 
   
YEAR 2000
    
 
   
  The services provided to the Fund and the shareholders by the Manager, the
Distributor, the Transfer Agent and the Custodian depend on the smooth
functioning of their computer systems and those of outside service providers.
Many computer software systems in use today cannot distinguish the year 2000
from the year 1900 because of the way dates are encoded and calculated. Such
event could have a negative impact on handling securities trades, payments of
interest and dividends, pricing and account services. Although, at this time,
there can be no assurance that there will be no adverse impact on the Fund, the
Manager, the Distributor, the Transfer Agent and the Custodian have advised the
Fund that they have been actively working on necessary changes to their computer
systems to prepare for the year 2000 and expect that their systems, and those of
outside service providers, will be adapted in time for the event.
    
 
   
  Additionally, issuers of securities generally as well as those purchased by
the Fund may confront year 2000 compliance issues which, if material and not
resolved, could have an adverse impact on securities markets and/or a specific
issuer's performance and result in a decline in the value of securities held by
the Fund.
    
 
                                       17

                         HOW THE FUND VALUES ITS SHARES
 
   
  THE SERIES' NET ASSET VALUE PER SHARE OR NAV IS DETERMINED BY SUBTRACTING ITS
LIABILITIES FROM THE VALUE OF ITS ASSETS AND DIVIDING THE REMAINDER BY THE
NUMBER OF OUTSTANDING SHARES. NAV IS CALCULATED SEPARATELY FOR EACH CLASS. THE
TRUSTEES HAVE FIXED THE SPECIFIC TIME OF DAY FOR THE COMPUTATION OF THE NAV OF
THE SERIES TO BE AS OF 4:15 P.M., NEW YORK TIME.
    
 
  Portfolio securities are valued based on market quotations or, if not readily
available, at fair value as determined in good faith under procedures
established by the Trustees. Securities may also be valued based on values
provided by a pricing service. See "Net Asset Value" in the Statement of
Additional Information.
 
  The Series will compute its NAV once daily on days that the New York Stock
Exchange is open for trading except on days on which no orders to purchase, sell
or redeem shares have been received by the Series or days on which changes in
the value of the Series' portfolio securities do not materially affect the NAV.
 
   
  Although the legal rights of each class of shares are substantially identical,
the different expenses borne by each class will result in different NAV's and
dividends. The NAV of Class B and Class C shares will generally be lower than
the NAV of Class A shares as a result of the larger distribution-related fee to
which Class B and Class C shares are subject. It is expected, however, that the
NAV of the three classes will tend to converge immediately after the recording
of dividends, if any, which will differ by approximately the amount of the
distribution and/or service fee expense accrual differential among the classes.
    
 
                      HOW THE FUND CALCULATES PERFORMANCE
 
  FROM TIME TO TIME THE FUND MAY ADVERTISE THE YIELD, TAX EQUIVALENT YIELD AND
AVERAGE ANNUAL TOTAL RETURN AND AGGREGATE TOTAL RETURN OF THE SERIES IN
ADVERTISEMENTS OR SALES LITERATURE. YIELD, TAX EQUIVALENT YIELD AND TOTAL RETURN
ARE CALCULATED SEPARATELY FOR CLASS A, CLASS B AND CLASS C SHARES. THESE FIGURES
ARE BASED ON HISTORICAL EARNINGS AND ARE NOT INTENDED TO INDICATE FUTURE
PERFORMANCE. The yield refers to the income generated by an investment in the
Series over a one-month or 30-day period. This income is then annualized; that
is, the amount of income generated by the investment during that 30-day period
is assumed to be generated each 30-day period for twelve periods and is shown as
a percentage of the investment. The income earned on the investment is also
assumed to be reinvested at the end of the sixth 30-day period. The tax
equivalent yield is calculated similarly to the yield, except that the yield is
increased using a stated income tax rate to demonstrate the taxable yield
necessary to produce an after-tax yield equivalent to the Series. The total
return shows how much an investment in the Series would have increased
(decreased) over a specified period of time (I.E., one, five or ten years or
since inception of the Series) assuming that all distributions and dividends by
the Series were reinvested on the reinvestment dates during the period and less
all recurring fees. The aggregate total return reflects actual performance over
a stated period of time. Average annual total return is a hypothetical rate of
return that, if achieved annually, would have produced the same aggregate total
return if performance had been constant over the entire period. Average annual
total return smooths out variations in performance and takes into account any
applicable initial or contingent deferred sales charges. Neither average annual
total return nor aggregate total return takes into account any federal or state
income taxes which may be payable upon redemption. The Fund also may include
comparative performance information in advertising or marketing the shares of
the Series. Such performance information may include data from Lipper Analytical
Services, Inc., Morningstar Publications, Inc., other industry publications,
business periodicals and market indices. See "Performance Information" in the
Statement of Additional Information. Further performance information is
contained in the Series' annual and semi-annual reports to shareholders, which
may be obtained without charge. See "Shareholder Guide--Shareholder
Services--Reports to Shareholders."
 
                                       18

                       TAXES, DIVIDENDS AND DISTRIBUTIONS
 
TAXATION OF THE FUND
 
   
  THE SERIES HAS QUALIFIED AND INTENDS TO REMAIN QUALIFIED AS A REGULATED
INVESTMENT COMPANY UNDER THE INTERNAL REVENUE CODE. ACCORDINGLY, THE SERIES WILL
NOT BE SUBJECT TO FEDERAL INCOME TAXES ON ITS NET INVESTMENT INCOME AND NET
CAPITAL GAINS, IF ANY, THAT IT DISTRIBUTES TO ITS SHAREHOLDERS. TO THE EXTENT
NOT DISTRIBUTED BY THE SERIES, NET TAXABLE INVESTMENT INCOME AND CAPITAL GAINS
AND LOSSES ARE TAXABLE TO THE SERIES. See "Taxes, Dividends and Distributions"
in the Statement of Additional Information.
    
 
   
  To the extent the Series invests in taxable obligations, it will earn taxable
investment income. Also, to the extent the Series sells securities or engages in
hedging transactions in futures contracts and options thereon, it may earn both
capital gain or loss. Capital gain or loss may also arise upon the sale of
municipal securities, as well as taxable obligations. Under the Internal Revenue
Code, special rules apply to the treatment of certain options and futures
contracts (Section 1256 contracts). At the end of each year, such investments
held by the Series will be required to be marked to market for federal income
tax purposes; that is, treated as having been sold at market value. Sixty
percent of any gain or loss recognized on these deemed sales and on actual
dispositions will be treated as long-term capital gain or loss, and the
remainder will be treated as short-term capital gain or loss. See "Taxes,
Dividends and Distributions" in the Statement of Additional Information.
    
 
   
  Gain or loss realized by the Series from the sale of securities generally will
be treated as capital gain or loss; however, gain from the sale of certain
securities (including municipal obligations) will be treated as taxable ordinary
income to the extent of any market discount. Market discount generally is the
difference, if any, between the price paid by the Series for the security and
the principal amount of the security (or, in the case of a security issued at an
original issue discount, the revised issue price of the security). The market
discount rule does not apply to any security that was acquired by the Series at
its original issue.
    
 
TAXATION OF SHAREHOLDERS
 
  In general, the character of tax-exempt interest distributed by the Series
will flow through as tax-exempt interest to its shareholders provided that 50%
or more of the value of its assets at the end of each quarter of its taxable
year is invested in state, municipal and other obligations, the interest on
which is excluded from gross income for federal income tax purposes. During
normal market conditions, at least 80% of the Series' total assets will be
invested in such obligations. See "How the Fund Invests--Investment Objective
and Policies."
 
   
  Any dividends out of net investment income, together with distributions of net
short-term gains (I.E., the excess of net short-term capital gains over net
long-term capital losses) distributed to shareholders, will be taxable as
ordinary income to the shareholder whether or not reinvested. Any net capital
gains (I.E., the excess of net capital gains from the sale of assets held for
more than 12 months over net short-term capital losses) distributed to
shareholders will be taxable as capital gains to the shareholders, whether or
not reinvested and regardless of the length of time a shareholder has owned his
or her shares. Recent legislation created various categories of capital gains
applicable to individuals. For capital gains recognized upon the sale of assets
by the Series after December 31, 1997. The maximum long-term capital gains tax
rate for individuals is 20%. The maximum capital gains tax rate for corporate
shareholders currently is the same as the maximum tax rate for ordinary income.
    
 
   
  Any gain or loss realized upon a sale or redemption of Series shares by a
shareholder who is not a dealer in securities will be treated as capital gain or
loss. Any such capital gain or loss will be treated as long-term capital gain or
loss if the shares were held for more than 12 months. In the case of an
individual, any such long-term capital gain will be taxable at the maximum rate
of 20%. The maximum capital gain tax rate for a corporation is the same as that
for ordinary income. Any loss with respect to shares that
    
 
                                       19

are held for six months or less, however, will be treated as long-term capital
loss to the extent of any capital gain distributions received by the
shareholder. In addition, any short-term capital loss will be disallowed to the
extent of any tax-exempt dividends received by the shareholder on shares that
are held for six months or less.
 
  The Fund has obtained opinions of counsel to the effect that neither (i) the
conversion of Class B shares into Class A shares nor (ii) the exchange of Class
B or Class C shares for Class A shares constitutes a taxable event for federal
income tax purposes. However, such opinions are not binding on the Internal
Revenue Service.
 
   
  CERTAIN INVESTORS MAY INCUR FEDERAL ALTERNATIVE MINIMUM TAX LIABILITY AS A
RESULT OF THEIR INVESTMENT IN THE FUND. Tax-exempt interest from certain
municipal obligations (I.E., certain private activity bonds issued after August
7, 1986) will be treated as an item of tax preference for purposes of the
alternative minimum tax. The Fund anticipates that, under regulations to be
promulgated, items of tax preference incurred by the Series will be attributed
to the Series' shareholders, although some portion of such items could be
allocated to the Series itself. Depending upon each shareholder's individual
circumstances, the attribution of items of tax preference incurred by the Series
could result in liability for the shareholder for the alternative minimum tax.
Similarly, the Series could be liable for the alternative minimum tax for items
of tax preference attributed to it. The Series is permitted to invest in
municipal obligations of the type that will produce items of tax preference.
    
 
   
  Distributions relating to interest on all municipal obligations will be
included in a corporate shareholder's current earnings for purposes of the
adjustment for current earnings for alternative minimum tax purposes. Corporate
shareholders should consult with their tax advisers with respect to this
potential adjustment.
    
 
  Under Maryland law, dividends paid by the Series are exempt from Maryland
personal income tax for individuals who reside in Maryland to the extent such
dividends are exempt from federal income tax and are derived from interest
payments on Maryland Obligations, provided, however, that up to 50% of dividends
attributable to interest received by the Series on certain private activity
bonds which are not issued by the State of Maryland or its political
subdivisions could be subject to Maryland individual income tax. In addition,
distributions attributable (i) to gain realized by the Series on the disposition
of those Maryland Obligations issued by the State of Maryland or its political
subdivisions and (ii) to interest received by the Series on U.S. Government
obligations are exempt from Maryland personal income tax.
 
  Distributions other than those described as exempt in the preceding paragraph
will be subject to Maryland personal income tax.
 
   
  Shareholders are advised to consult their own tax advisers regarding specific
questions as to federal, state or local taxes. See "Taxes, Dividends and
Distributions" in the Statement of Additional Information.
    
 
WITHHOLDING TAXES
 
  Under the Internal Revenue Code, the Series is required to withhold and remit
to the U.S. Treasury 31% of redemption proceeds on the accounts of certain
shareholders who fail to furnish their tax identification numbers on IRS Form
W-9 (or IRS Form W-8 in the case of certain foreign shareholders) with the
required certifications regarding the shareholder's status under the federal
income tax law. Such withholding also is required on taxable dividends and
capital gain distributions made by the Series unless it is reasonably expected
that at least 95% of the distributions of the Series are comprised of tax-exempt
dividends.
 
  Dividends of net taxable investment income and distributions of net short-term
capital gains paid to a shareholder (including a shareholder acting as a nominee
or fiduciary) who is a nonresident alien individual, a foreign corporation or a
foreign partnership (foreign shareholder) are subject to a 30% (or lower treaty
rate) withholding tax upon the gross amount of the dividends unless the
dividends are effectively connected with a U.S. trade or business conducted by
the foreign shareholder. Capital gain dividends paid to a foreign shareholder
are generally not subject to withholding tax. A foreign shareholder will,
however, be required to pay U.S. income tax on any dividends and capital gain
distributions which are effectively connected with a U.S. trade or business of
the foreign shareholder.
 
                                       20

DIVIDENDS AND DISTRIBUTIONS
 
  THE SERIES EXPECTS TO DECLARE DAILY AND PAY MONTHLY DIVIDENDS OF NET
INVESTMENT INCOME, IF ANY, AND MAKE DISTRIBUTIONS AT LEAST ANNUALLY OF ANY
CAPITAL GAINS IN EXCESS OF CAPITAL LOSSES. Dividends paid by the Series with
respect to each class of shares, to the extent any dividends are paid, will be
calculated in the same manner, at the same time, on the same day and will be in
the same amount except that each class will bear its own distribution charges,
generally resulting in lower dividends for Class B and Class C shares.
Distributions of net capital gains, if any, will be paid in the same amount for
each class of shares. See "How the Fund Values its Shares."
 
   
  DIVIDENDS AND DISTRIBUTIONS WILL BE PAID IN ADDITIONAL SHARES OF THE SERIES
BASED ON THE NAV OF EACH CLASS OF THE SERIES ON THE PAYMENT DATE AND RECORD
DATE, RESPECTIVELY, OR SUCH OTHER DATE AS THE TRUSTEES MAY DETERMINE, UNLESS THE
SHAREHOLDER ELECTS IN WRITING NOT LESS THAN FIVE BUSINESS DAYS PRIOR TO THE
RECORD DATE TO RECEIVE SUCH DIVIDENDS AND DISTRIBUTIONS IN CASH. Such election
should be submitted to Prudential Mutual Fund Services LLC, Attention: Account
Maintenance P.O. Box 15015, New Brunswick, New Jersey 08906-5015. The Fund will
notify each shareholder after the close of the Fund's taxable year of both the
dollar amount and the taxable status of that year's dividends and distributions
on a per share basis.
    
 
   
  IF YOU BUY SHARES ON OR IMMEDIATELY BEFORE THE RECORD DATE (THE DATE THAT
DETERMINES WHO RECEIVES THE DIVIDEND), YOU WILL RECEIVE A PORTION OF THE MONEY
YOU INVESTED AS A TAXABLE DIVIDEND. THEREFORE, YOU SHOULD CONSIDER THE TIMING OF
DIVIDENDS WHEN BUYING SHARES OF THE FUND.
    
 
                              GENERAL INFORMATION
 
DESCRIPTION OF SHARES
 
  THE FUND WAS ESTABLISHED AS A MASSACHUSETTS BUSINESS TRUST ON MAY 18, 1984, BY
A DECLARATION OF TRUST. The Fund's activities are supervised by its Trustees.
The Declaration of Trust permits the Trustees to issue an unlimited number of
full and fractional shares in separate series, currently designated as the
Connecticut Money Market Series, Florida Series, Maryland Series, Massachusetts
Series, Massachusetts Money Market Series, Michigan Series, New Jersey Series,
New Jersey Money Market Series, New York Series, New York Money Market Series,
North Carolina Series, Ohio Series and Pennsylvania Series. The Series is
authorized to issue an unlimited number of shares, divided into three classes,
designated Class A, Class B and Class C. Each class of shares represents an
interest in the same assets of the Series and are identical in all respects
except that (i) each class is subject to different sales charges and
distribution and/or service fees, which may affect performance, (ii) each class
has exclusive voting rights on any matter submitted to shareholders that relates
solely to its arrangement and has separate voting rights on any matter submitted
to shareholders in which the interests of one class differ from the interests of
any other class, (iii) each class has a different exchange privilege and (iv)
only Class B shares have a conversion feature. See "How the Fund is
Managed--Distributor." In accordance with the Fund's Declaration of Trust, the
Trustees may authorize the creation of additional series and classes within such
series, with such preferences, privileges, limitations and voting and dividend
rights as the Trustees may determine.
 
  Shares of the Fund, when issued, are fully paid, nonassessable, fully
transferable and redeemable at the option of the holder. Shares are also
redeemable at the option of the Fund under certain circumstances as described
under "Shareholder Guide--How to Sell Your Shares." Each share of each class of
the Series is equal as to earnings, assets and voting privileges, except as
noted above, and each class bears the expenses related to the distribution of
its shares. Except for the conversion feature applicable to the Class B shares,
there are no conversion, preemptive or other subscription rights. In the event
of liquidation, each share of beneficial interest of each series is entitled to
its portion of all of the Fund's assets after all debt and expenses of the Fund
have
 
                                       21

been paid. Since Class B and Class C shares generally bear higher distribution
expenses than Class A shares, the liquidation proceeds to shareholders of those
classes are likely to be lower than to Class A shareholders. The Fund's shares
do not have cumulative voting rights for the election of Trustees.
 
  THE FUND DOES NOT INTEND TO HOLD ANNUAL MEETINGS OF SHAREHOLDERS UNLESS
OTHERWISE REQUIRED BY LAW. THE FUND WILL NOT BE REQUIRED TO HOLD MEETINGS OF
SHAREHOLDERS UNLESS, FOR EXAMPLE, THE ELECTION OF TRUSTEES IS REQUIRED TO BE
ACTED UPON BY SHAREHOLDERS UNDER THE INVESTMENT COMPANY ACT. SHAREHOLDERS HAVE
CERTAIN RIGHTS, INCLUDING THE RIGHT TO CALL A MEETING UPON A VOTE OF 10% OF THE
FUND'S OUTSTANDING SHARES FOR THE PURPOSE OF VOTING ON THE REMOVAL OF ONE OR
MORE TRUSTEES OR TO TRANSACT ANY OTHER BUSINESS.
 
  The Declaration of Trust and the By-Laws of the Fund are designed to make the
Fund similar in certain respects to a Massachusetts business corporation. The
principal distinction between a Massachusetts business corporation and a
Massachusetts business trust relates to shareholder liability. Under
Massachusetts law, shareholders of a business trust may, under certain
circumstances, be held personally liable as partners for the obligations of the
fund, which is not the case with a corporation. The Declaration of Trust of the
Fund provides that shareholders shall not be subject to any personal liability
for the acts or obligations of the Fund and that every written obligation,
contract, instrument or undertaking made by the Fund shall contain a provision
to the effect that the shareholders are not individually bound thereunder.
 
ADDITIONAL INFORMATION
 
   
  This Prospectus, including the Statement of Additional Information which has
been incorporated by reference herein, does not contain all the information set
forth in the Registration Statement filed by the Fund with the Commission under
the Securities Act. Copies of the Registration Statement may be obtained at a
reasonable charge from the Commission or may be examined, without charge, at the
office of the Commission in Washington, D.C.
    
 
                               SHAREHOLDER GUIDE
 
HOW TO BUY SHARES OF THE FUND
 
   
  The Trustees of the Fund have recently approved a proposal to exchange the
assets and liabilities of the Series of the Fund for shares of Prudential
National Municipals Fund, Inc. (National Municipals Fund). Class A, Class B and
Class C shares of the Series would be exchanged at relative net asset value for
Class A shares of National Municipals Fund, the investment objective of which is
to seek a high level of current income exempt from federal income taxes. The
transfer has been approved by the Trustees of the Fund and by the Board of
Directors of National Municipals Fund and is subject to approval by the
shareholders of the Series. It is anticipated that a proxy statement/prospectus
relating to the transaction will be mailed to the Series' shareholders in late
October 1998.
    
 
   
  Under the terms of the proposal, shareholders of the Series would become
shareholders of National Municipals Fund. No sales charge would be imposed on
the proposed transfer. The Fund anticipates obtaining an opinion of its counsel
that the transaction would be a tax-free reorganization under the Internal
Revenue Code and therefore no gain or loss for Federal income tax purposes would
be recognized by shareholders of the Series.
    
 
   
  EFFECTIVE IMMEDIATELY, THE FUND WILL NO LONGER ACCEPT ORDERS TO PURCHASE OR
EXCHANGE FOR SHARES OF THE SERIES, EXCEPT FOR PURCHASES BY CERTAIN RETIREMENT
AND EMPLOYEE PLANS (EXCLUDING IRA ACCOUNTS). Existing shareholders may continue
to acquire shares through dividend reinvestment. The current redemption
privilege and the current exchange privilege of obtaining shares of other
Prudential Mutual Funds will remain in effect until the transaction is
consummated. If the transaction is not consummated, the Fund will resume
accepting orders to purchase or exchange for shares of the Series. See "How to
Sell Your Shares" and "How to Exchange Your Shares" below.
    
 
                                       22

   
  IF THE FUND RESUMES ACCEPTING ORDERS TO PURCHASE SHARES OF THE SERIES, YOU MAY
PURCHASE SHARES OF THE SERIES THROUGH THE DISTRIBUTOR, THROUGH DEALERS INCLUDING
PRUDENTIAL SECURITIES OR PRUSEC, OR DIRECTLY FROM THE FUND THROUGH ITS TRANSFER
AGENT, PRUDENTIAL MUTUAL FUND SERVICES LLC (PMFS OR THE TRANSFER AGENT),
ATTENTION: INVESTMENT SERVICES, P.O. BOX 15020, NEW BRUNSWICK, NEW JERSEY
08906-5020. The purchase price is the NAV next determined following receipt of
an order in proper form (in accordance with procedures established by the
Transfer Agent in connection with investors' accounts) by the Distributor, your
Dealer or the Transfer Agent plus a sales charge which, at your option, may be
imposed either at the time of purchase, on a deferred basis, or both. Class A
shares are sold with a front-end sales charge. Class B shares are subject to a
CDSC. Class C shares are sold with a low front-end sales charge, but are also
subject to a CDSC. Payments may be made by wire, check or through your brokerage
account. See also "Alternative Purchase Plan" below and "How the Fund Values its
Shares."
    
 
  An investment in the Series may not be appropriate for tax-exempt or
tax-deferred investors. Such investors should consult their own tax advisers.
 
   
  The minimum initial investment is $1,000 for Class A and Class B shares and
$2,500 for Class C shares. The minimum subsequent investment is $100 for all
classes. All minimum investment requirements are waived for certain employee
savings plans. For purchases made through the Automatic Investment Plan, the
minimum initial and subsequent investment is $50. See "Shareholder Services"
below.
    
 
  The Fund reserves the right to reject any purchase order (including an
exchange into the Series) or to suspend or modify the continuous offering of its
shares. See "How to Sell Your Shares" below.
 
   
  Application forms can be obtained from the Transfer Agent, your Dealer or the
Distributor. If a share certificate is desired, it must be requested in writing
for each transaction. Certificates are issued only for full shares. Shareholders
who hold their shares through Prudential Securities will not receive share
certificates.
    
 
   
  Your Dealer is responsible for forwarding payment promptly to the Fund. The
Distributor reserves the right to cancel any purchase order for which payment
has not been received by the third business day following the placement of the
order.
    
 
   
  Dealers may charge their customers a separate fee for processing purchases and
redemptions. In addition, transactions in shares of the Series may be subject to
postage and handling charges imposed by your Dealer. Any such charge is retained
by the Dealer and is not remitted to the Fund.
    
 
  PURCHASE BY WIRE. For an initial purchase of shares of the Series by wire, you
must first telephone PMFS at (800) 225-1852 (toll-free) to receive an account
number. The following information will be requested: your name, address, tax
identification number, class election, dividend distribution election, amount
being wired and wiring bank. Instructions should then be given by you to your
bank to transfer funds by wire to State Street Bank and Trust Company (State
Street), Boston, Massachusetts, Custody and Shareholder Services Division,
Attention: Prudential Municipal Series Fund (Maryland Series), specifying on the
wire the account number assigned by PMFS and your name and identifying the class
in which you are eligible to invest (Class A, Class B or Class C shares).
 
   
  If you arrange for receipt by State Street of federal funds prior to the
calculation of NAV (4:15 P.M., New York time), on a business day, you may
purchase shares of the Series as of that day. See "Net Asset Value" in the
Statement of Additional Information.
    
 
   
  In making a subsequent purchase order by wire, you should wire State Street
directly and should be sure that the wire specifies Prudential Municipal Series
Fund, the name of the Series, Class A, Class B or Class C shares and your name
and individual account number. It is not necessary to call PMFS to make
subsequent purchase orders utilizing federal funds. The minimum amount which may
be invested by wire is $1,000.
    
 
                                       23

ALTERNATIVE PURCHASE PLAN
 
   
  THE SERIES OFFERS THROUGH THIS PROSPECTUS THREE CLASSES OF SHARES (CLASS A,
CLASS B AND CLASS C SHARES) WHICH ALLOWS YOU TO CHOOSE THE MOST BENEFICIAL SALES
CHARGE STRUCTURE FOR YOUR INDIVIDUAL CIRCUMSTANCES, GIVEN THE AMOUNT OF THE
PURCHASE, THE LENGTH OF TIME YOU EXPECT TO HOLD THE SHARES AND OTHER RELEVANT
CIRCUMSTANCES (ALTERNATIVE PURCHASE PLAN).
    
 
   


                                                            ANNUAL 12b-1 FEES
                                                           (AS A % OF AVERAGE
                        SALES CHARGE                        DAILY NET ASSETS)                     OTHER INFORMATION
             -----------------------------------   -----------------------------------   -----------------------------------
                                                                                
CLASS A      Maximum initial sales charge of 3%    .30 of 1%                             Initial sales charge waived or
             of the public offering price                                                reduced for certain purchases
 
CLASS B      Maximum contingent deferred sales     .50 of 1%                             Shares convert to Class A shares
             charge or CDSC of 5% of the lesser                                          approximately seven years after
             of the amount invested or the                                               purchase
             redemption proceeds; declines to
             zero after six years
 
CLASS C      Maximum initial sales charge of 1%    1%                                    Shares do not convert to another
             of the public offering price and                                            class
             maximum CDSC of 1% of the lesser of
             the amount invested or the
             redemption proceeds on redemptions
             made within 18 months of purchase

    
 
   
  The three classes of shares represent an interest in the same portfolio of
investments of the Series and have the same rights, except that (i) each class
is subject to different sales charges and distribution and/or service fees which
may affect performance, (ii) each class has exclusive voting rights on any
matter submitted to shareholders that relates solely to its arrangement and has
separate voting rights on any matter submitted to shareholders in which the
interests of one class differ from the interests of any other class, (iii) each
class has a different exchange privilege, and (iv) only Class B shares have a
conversion feature. See "How to Exchange Your Shares" below. The income
attributable to each class and the dividends payable on the shares of each class
will be reduced by the amount of the distribution fee (if any) of each class.
Class B and Class C shares bear the expenses of a higher distribution fee which
will generally cause them to have higher expense ratios and to pay lower
dividends than the Class A shares.
    
 
   
  Dealers, financial advisers and other sales agents who sell shares of the
Series will receive different compensation for selling Class A, Class B and
Class C shares and will generally receive more compensation initially for
selling Class A and Class B shares than for selling Class C shares.
    
 
  IN SELECTING A PURCHASE ALTERNATIVE, YOU SHOULD CONSIDER, AMONG OTHER
THINGS,(1) the length of time you expect to hold your investment, (2) the amount
of any applicable sales charge (whether imposed at the time of purchase or
redemption) and distribution-related fees, as noted above, (3) whether you
qualify for any reduction or waiver of any applicable sales charge, (4) the
various exchange privileges among the different classes of shares (see "How to
Exchange Your Shares" below) and (5) the fact that Class B shares automatically
convert to Class A shares approximately seven years after purchase (see
"Conversion Feature--Class B Shares" below).
 
   
  The following is provided to assist you in determining which method of
purchase best suits your individual circumstances and is based on current fees
and expenses being charged to the Series:
    
 
   
  If you intend to hold your investment in a Fund for less than 3 years and do
not qualify for a reduced sales charge on Class A shares, since Class A shares
are subject to a maximum initial sales charge of 3% and Class B shares are
subject to a CDSC of 5% which declines to zero over a 6 year period, you should
consider purchasing Class C shares over either Class A or Class B shares.
    
 
                                       24

   
  If you intend to hold your investment for more than 3 years, but less than 4
years, or for more than 5 years, but less than 6 years, you should consider
purchasing Class A shares, because the maximum 3% initial sales charge plus the
cumulative annual distribution-related fee on Class A shares would be lower
than: (i) the CDSC plus the cumulative annual distribution-related fee on Class
B shares; and (ii) the 1% initial sales charge plus the cumulative annual
distribution-related fee on Class C shares.
    
 
   
  If you intend to hold your investment for more than 4 years, but less than 5
years, you may consider purchasing Class A or Class B shares because: (i) the
maximum 3% initial sales charge plus the cumulative annual distribution-related
fee on Class A shares and (ii) the CDSC plus the cumulative annual
distribution-related fee on Class B shares would be lower than the 1% initial
sales charge plus the cumulative annual distribution-related fee on Class C
shares.
    
 
   
  If you intend to hold your investment for more than 6 years and do not qualify
for a reduced sales charge on Class A shares, since Class B shares convert to
Class A shares approximately 7 years after purchase and because all of your
money would be invested initially in the case of Class B shares, you should
consider purchasing Class B shares over either Class A or Class C shares.
    
 
   
  If you qualify for a reduced sales charge on Class A shares, it may be more
advantageous for you to purchase Class A shares over either Class B or Class C
shares regardless of how long you intend to hold your investment. However,
unlike Class B shares, you would not have all of your money invested initially
because the sales charge on Class A shares is deducted at the time of purchase.
    
 
   
  If you do not qualify for a reduced sales charge on Class A shares and you
purchase Class C shares, you would have to hold your investment for more than 3
years for the 1% initial sales charge plus the higher cumulative annual
distribution-related fee on the Class C shares to exceed the initial sales
charge plus cumulative annual distribution-related fees on Class A shares. This
does not take into account the time value of money, which further reduces the
impact of the higher Class C distribution-related fee on the investment,
fluctuations in NAV, the effect of the return on the investment over this period
of time or redemptions when the CDSC is applicable.
    
 
  ALL PURCHASES OF $1 MILLION OR MORE, EITHER AS PART OF A SINGLE INVESTMENT OR
UNDER RIGHTS OF ACCUMULATION OR LETTERS OF INTENT, MUST BE FOR CLASS A SHARES.
See "Reduction and Waiver of Initial Sales Charges" below.
 
  CLASS A SHARES
 
  The offering price of Class A shares for investors choosing the initial sales
charge alternative is the next determined NAV plus a sales charge (expressed as
a percentage of the offering price and of the amount invested) as shown in the
following table:
 


                                    SALES CHARGE AS   SALES CHARGE AS   DEALER CONCESSION
                                     PERCENTAGE OF     PERCENTAGE OF    AS PERCENTAGE OF
             AMOUNT OF PURCHASE     OFFERING PRICE    AMOUNT INVESTED    OFFERING PRICE
          ------------------------  ---------------   ---------------   -----------------
                                                               
          Less than $99,999              3.00%             3.09%              3.00%
          $100,000 to $249,999           2.50              2.56               2.50
          $250,000 to $499,999           1.50              1.52               1.50
          $500,000 to $999,999           1.00              1.01               1.00
          $1,000,000 and above           None              None               None

 
                                       25

   
  The Distributor may reallow the entire initial sales charge to Dealers.
Dealers may be deemed to be underwriters, as that term is defined under federal
securities laws. The Distributor reserves the right, without prior notice to any
Dealer, to suspend or eliminate Dealer concessions or commissions.
    
 
   
  In connection with the sale of Class A shares at NAV (without payment of an
initial sales charge), the Manager, the Distributor or one of their affiliates
may pay Dealers, financial advisers and other persons which distribute shares a
finders' fee from their own resources based on a percentage of the NAV of shares
sold by such persons.
    
 
  REDUCTION AND WAIVER OF INITIAL SALES CHARGES. Reduced sales charges are
available through Rights of Accumulation and Letters of Intent. Shares of the
Fund and shares of other Prudential Mutual Funds (excluding money market funds
other than those acquired pursuant to the exchange privilege) may be aggregated
to determine the applicable reduction. See "Purchase and Redemption of Fund
Shares--Reduction and Waiver of Initial Sales Charges--Class A Shares" in the
Statement of Additional Information.
 
   
  OTHER WAIVERS. Class A shares may be purchased at NAV, through the Distributor
or the Transfer Agent, by the following persons: (a) officers of Prudential
Mutual Funds (including the Fund), (b) employees of the Distributor, Prudential
Securities, PIFM and their subsidiaries and members of the families of such
persons who maintain an employee related account at Prudential Securities or the
Transfer Agent, (c) employees of subadvisers of the Prudential Mutual Funds
provided that the purchases at NAV are permitted by such person's employer, (d)
Prudential, employees and special agents of Prudential and its subsidiaries and
all persons who have retired directly from active service with Prudential or one
of its subsidiaries, (e) registered representatives and employees of Dealers who
have entered into a selected dealer agreement with the Distributor, provided
that purchases at NAV are permitted by such person's employer and (f) investors
who have a business relationship with a financial adviser who joined Prudential
Securities from another investment firm, provided that (i) the purchase is made
within 180 days of the commencement of the financial adviser's employment at
Prudential Securities or within one year in the case of benefit plans, (ii) the
purchase is made with proceeds of a redemption of shares of any open-end
non-money market fund sponsored by the financial adviser's previous employer
(other than a fund which imposes a distribution or service fee of .25 of 1% or
less) and (iii) the financial adviser served as the client's broker on the
previous purchases.
    
 
   
  For an investor to obtain any reduction or waiver of the initial sales
charges, at the time of the sale either the Transfer Agent must be notified
directly by the investor or the Distributor must be notified by the Dealer
facilitating the transaction that the sale qualifies for the reduced or waived
sales charge. The reduction or waiver will be granted subject to confirmation of
your entitlement. No initial sales charges are imposed upon Class A shares
acquired upon the reinvestment of dividends and distributions. See "Purchase and
Redemption of Fund Shares--Reduction and Waiver of Initial Sales Charges--Class
A Shares" in the Statement of Additional Information.
    
 
   
  CLASS B AND CLASS C SHARES
    
 
   
  The offering price of Class B shares is the NAV next determined following
receipt of an order in proper form by the Transfer Agent, your Dealer or the
Distributor. The offering price of Class C shares is the NAV next determined
following receipt of an order in proper form by the Transfer Agent, your Dealer
or the Distributor plus a sales charge equal to 1% of the public offering price.
Redemption of Class B and Class C shares may be subject to a CDSC. See "How to
Sell Your Shares--Contingent Deferred Sales Charges."
    
 
   
  The Distributor will pay, from its own resources, sales commissions of up to
4% of the purchase price of Class B shares to Dealers, financial advisers and
other persons who sell Class B shares at the time of sale. This facilitates the
ability of the Trust to sell the Class B shares of the Funds without an initial
sales charge being deducted at the time of purchase. The Distributor anticipates
that it will recoup its advancement of sales commissions from the combination of
the CDSC and the distribution fee. In connection with the sale of Class C
shares, the Distributor will pay, partially from its own resources, Dealers,
financial advisers
    
 
                                       26

   
and other persons which distribute Class C shares a sales commission of up to 2%
of the purchase price at the time of the sale. The Distributor anticipates that
it would recoup its advancement of sales commissions from the combination of the
CDSC and the distribution fee. See "How the Fund is Managed--Distributor."
    
 
   
  WAIVER OF INITIAL SALES CHARGE--CLASS C SHARES
    
 
   
  INVESTMENTS OF REDEMPTION PROCEEDS FROM OTHER INVESTMENT COMPANIES. Investors
may purchase Class C shares at NAV, without the initial sales charge, with the
proceeds from the redemption of shares of any unaffiliated registered investment
company which were not held through an account with any Prudential affiliate.
Such purchases must be made within 60 days of the redemption. Investors eligible
for this waiver include: (i) investors purchasing shares through an account at
Prudential Securities Incorporated; (ii) investors purchasing shares through an
ADVANTAGE Account or an Investor Account with Pruco Securities Corporation; and
(iii) investors purchasing shares through other Dealers. This waiver is not
available to investors who purchase shares directly from the Transfer Agent. You
must notify the Transfer Agent directly or through your Dealer if you are
entitled to this waiver and provide the Transfer Agent with such supporting
documents as it may deem appropriate.
    
 
HOW TO SELL YOUR SHARES
 
   
  YOU CAN REDEEM YOUR SHARES OF THE SERIES AT ANY TIME FOR CASH AT THE NAV NEXT
DETERMINED AFTER THE REDEMPTION REQUEST IS RECEIVED IN PROPER FORM (IN
ACCORDANCE WITH PROCEDURES ESTABLISHED BY THE TRANSFER AGENT IN CONNECTION WITH
INVESTORS' ACCOUNTS) BY THE DISTRIBUTOR, YOUR DEALER OR THE TRANSFER AGENT. SEE
"HOW THE FUND VALUES ITS SHARES." In certain cases, however, redemption proceeds
will be reduced by the amount of any applicable CDSC, as described below. See
"Contingent Deferred Sales Charges" below. If you are redeeming your shares
through a Dealer, your Dealer must receive your sell order before the Fund
computes its NAV for that day (I.E., 4:15 p.m., New York time) in order to
receive that day's NAV. Your Dealer will be responsible for furnishing all
necessary documentation to the Distributor and may charge you for its services
in connection with redeeming shares of the Fund.
    
 
   
  IF YOU HOLD SHARES IN NON-CERTIFICATE FORM, A WRITTEN REQUEST FOR REDEMPTION
SIGNED BY YOU EXACTLY AS THE ACCOUNT IS REGISTERED IS REQUIRED. IF YOU HOLD
CERTIFICATES, THE CERTIFICATES, SIGNED IN THE NAME(S) SHOWN ON THE FACE OF THE
CERTIFICATES, MUST BE RECEIVED BY THE TRANSFER AGENT, THE DISTRIBUTOR OR YOUR
DEALER IN ORDER FOR THE REDEMPTION REQUEST TO BE PROCESSED. IF REDEMPTION IS
REQUESTED BY A CORPORATION, PARTNERSHIP, TRUST OR FIDUCIARY, WRITTEN EVIDENCE OF
AUTHORITY ACCEPTABLE TO THE TRANSFER AGENT MUST BE SUBMITTED BEFORE SUCH REQUEST
WILL BE ACCEPTED. All correspondence and documents concerning redemptions should
be sent to the Fund in care of its Transfer Agent, Prudential Mutual Fund
Services LLC, Attention: Redemption Services, P.O. Box 15010, New Brunswick, New
Jersey 08906-5010, the Distributor or your Dealer.
    
 
   
  If the proceeds of the redemption (a) exceed $50,000, (b) are to be paid to a
person other than the record owner, (c) are to be sent to an address other than
the address on the Transfer Agent's records, or (d) are to be paid to a
corporation, partnership, trust or fiduciary, the signature(s) on the redemption
request and on the certificates, if any, or stock power must be guaranteed by an
eligible guarantor institution. An eligible guarantor institution includes any
bank, broker, dealer or credit union. The Transfer Agent reserves the right to
request additional information from, and make reasonable inquiries of, any
eligible guarantor institution.
    
 
   
  PAYMENT FOR SHARES PRESENTED FOR REDEMPTION WILL BE MADE BY CHECK WITHIN SEVEN
DAYS AFTER RECEIPT BY THE TRANSFER AGENT, THE DISTRIBUTOR OR YOUR DEALER OF THE
CERTIFICATE AND/OR WRITTEN REQUEST EXCEPT AS INDICATED BELOW. IF YOU HOLD SHARES
THROUGH A DEALER, PAYMENT FOR SHARES PRESENTED FOR REDEMPTION WILL BE CREDITED
TO YOUR ACCOUNT AT YOUR DEALER, UNLESS YOU INDICATE OTHERWISE. Such payment may
be postponed or the right of redemption suspended at times (a) when the New York
Stock Exchange is closed for other than customary weekends and holidays, (b)
when trading on such Exchange is restricted, (c) when an emergency exists as a
result of which disposal by the Series of securities owned by it is not
reasonably practicable or it is not reasonably practicable for the Series fairly
to determine the value of its net assets, or (d) during any other period when
the Commission, by order, so permits: provided that applicable rules and
regulations of the Commission shall govern as to whether the conditions
prescribed in (b), (c) or (d) exist.
    
 
                                       27

   
  PAYMENT FOR REDEMPTION OF RECENTLY PURCHASED SHARES WILL BE DELAYED UNTIL THE
FUND OR ITS TRANSFER AGENT HAS BEEN ADVISED THAT THE PURCHASE CHECK HAS BEEN
HONORED, WHICH MAY TAKE UP TO 10 CALENDAR DAYS FROM THE TIME OF RECEIPT OF THE
PURCHASE CHECK BY THE TRANSFER AGENT. SUCH DELAY MAY BE AVOIDED BY PURCHASING
SHARES BY WIRE OR BY CERTIFIED OR CASHIER'S CHECK.
    
 
   
  REDEMPTION IN KIND. If the Trustees determine that it would be detrimental to
the best interests of the remaining shareholders of the Fund to make payment
wholly or partly in cash, the Fund may pay the redemption price in whole or in
part by a distribution in kind of securities from the investment portfolio of
the Series of the Fund, in lieu of cash, in conformity with applicable rules of
the Commission. Securities will be readily marketable and will be valued in the
same manner as in a regular redemption. See "How the Fund Values its Shares." If
your shares are redeemed in kind, you will incur transaction costs in converting
the assets into cash. The Fund, however, has elected to be governed by Rule
18f-1 under the Investment Company Act, under which the Fund is obligated to
redeem shares solely in cash up to the lesser of $250,000 or 1% of the NAV of
the Fund during any 90-day period for any one shareholder.
    
 
   
  INVOLUNTARY REDEMPTION. In order to reduce expenses of the Fund, the Trustees
may redeem all of the shares of any shareholder, other than a shareholder which
is an IRA or other tax-deferred retirement plan, whose account has a NAV of less
than $500 due to a redemption. The Fund will give such shareholders 60 days'
prior written notice in which to purchase sufficient additional shares to avoid
such redemption. No CDSC will be imposed on any such involuntary redemption.
    
 
   
  90-DAY REPURCHASE PRIVILEGE. If you redeem your shares and have not previously
exercised the repurchase privilege, you may reinvest any portion or all of the
proceeds of such redemption in shares of the Series at the NAV next determined
after the order is received, which must be within 90 days after the date of the
redemption. Any CDSC paid in connection with such redemption will be credited
(in shares) to your account. If less than a full repurchase is made, the credit
will be on a PRO RATA basis. You must notify the Transfer Agent, either directly
or through the Distributor or your Dealer, at the time the repurchase privilege
is exercised to adjust your account for the CDSC you previously paid.
Thereafter, any redemptions will be subject to the CDSC applicable at the time
of the redemption. See "Contingent Deferred Sales Charges" below. Exercise of
the repurchase privilege may affect the federal tax treatment of any gain
realized upon redemption.
    
 
  CONTINGENT DEFERRED SALES CHARGES
 
   
  Redemptions of Class B shares will be subject to a CDSC declining from 5% to
zero over a six-year period. Class C shares redeemed within 18 months of
purchase will be subject to a 1% CDSC. The CDSC will be deducted from the
redemption proceeds and reduce the amount paid to you. The CDSC will be imposed
on any redemption by you which reduces the current value of your Class B or
Class C shares to an amount which is lower than the amount of all payments by
you for shares during the preceding six years, in the case of Class B shares,
and one year, in the case of Class C shares. A CDSC will be applied on the
lesser of the original purchase price or the current value of the shares being
redeemed. Increases in the value of your shares or shares acquired through
reinvestment of dividends or distributions are not subject to a CDSC. The amount
of any CDSC will be paid to and retained by the Distributor. See "How the Fund
is Managed--Distributor" and "Waiver of Contingent Deferred Sales Charges--Class
B Shares" below.
    
 
  The amount of the CDSC, if any, will vary depending on the number of years
from the time of payment for the purchase of shares until the time of redemption
of such shares. Solely for purposes of determining the number of years from the
time of any payment for the purchase of shares, all payments during a month will
be aggregated and deemed to have been made on the last day of the month. The
CDSC will be calculated from the first day of the month after the initial
purchase, excluding the time shares were held in a money market fund. See "How
to Exchange Your Shares" below.
 
                                       28

  The following table sets forth the rates of the CDSC applicable to redemptions
of Class B shares:
 


                                             CONTINGENT DEFERRED SALES
                                              CHARGE AS A PERCENTAGE
          YEAR SINCE PURCHASE                 OF DOLLARS INVESTED OR
          PAYMENT MADE                          REDEMPTION PROCEEDS
          ------------------------------     -------------------------
                                          
          First.........................                5.0%
          Second........................                4.0
          Third.........................                3.0
          Fourth........................                2.0
          Fifth.........................                1.0
          Sixth.........................                1.0
          Seventh.......................               None

 
   
  In determining whether a CDSC is applicable to a redemption, the calculation
will be made in a manner that results in the lowest possible rate. It will be
assumed that the redemption is made first of amounts representing shares
acquired pursuant to the reinvestment of dividends and distributions; then of
amounts representing the increase in NAV above the total amount of payments for
the purchase of Series shares made during the preceding six years (five years
for Class B shares purchased prior to January 22, 1990); then of amounts
representing the cost of shares held beyond the applicable CDSC period; and
finally, of amounts representing the cost of shares held for the longest period
of time within the applicable CDSC period.
    
 
  For example, assume you purchased 100 Class B shares at $10 per share for a
cost of $1,000. Subsequently, you acquired 5 additional Class B shares through
dividend reinvestment. During the second year after the purchase you decided to
redeem $500 of your investment. Assuming at the time of the redemption the NAV
had appreciated to $12 per share, the value of your Class B shares would be
$1,260 (105 shares at $12 per share). The CDSC would not be applied to the value
of the reinvested dividend shares and the amount which represents appreciation
($260). Therefore, $240 of the $500 redemption proceeds ($500 minus $260) would
be charged at a rate of 4% (the applicable rate in the second year after
purchase) for a total CDSC of $9.60.
 
  For federal income tax purposes, the amount of the CDSC will reduce the gain
or increase the loss, as the case may be, on the amount recognized on the
redemption of shares.
 
   
  WAIVER OF CONTINGENT DEFERRED SALES CHARGES--CLASS B SHARES. The CDSC will be
waived in the case of a redemption following the death or disability of a
shareholder or, in the case of a trust account, following the death or
disability of the grantor. The waiver is available for total or partial
redemptions of shares owned by a person, either individually or in joint tenancy
(with rights of survivorship), at the time of death or initial determination of
disability, provided that the shares were purchased prior to death or
disability. In addition, the CDSC will be waived on redemptions of shares held
by a Trustee of the Fund.
    
 
  SYSTEMATIC WITHDRAWAL PLAN. The CDSC will be waived (or reduced) on certain
redemptions from a Systematic Withdrawal Plan. On an annual basis, up to 12% of
the total dollar amount subject to the CDSC may be redeemed without charge. The
Transfer Agent will calculate the total amount available for this waiver
annually on the anniversary of your purchase or, for shares purchased prior to
March 1, 1997, on March 1 of the current year. The CDSC will be waived (or
reduced) on redemptions until this threshold 12% amount is reached.
 
   
  You must notify the Transfer Agent either directly or through your Dealer, at
the time of redemption, that you are entitled to waiver of the CDSC and provide
the Transfer Agent with such supporting documentation as it may deem
appropriate. The waiver will be granted subject to confirmation of your
entitlement. See "Purchase and Redemption of Fund Shares--Waiver of the
Contingent Deferred Sales Charge--Class B Shares" in the Statement of Additional
Information.
    
 
   
  A quantity discount may apply to redemptions of Class B shares purchased prior
to August 1, 1994. See "Purchase and Redemption of Fund Shares--Quantity
Discount--Class B Shares Purchased Prior to August 1, 1994" in the Statement of
Additional Information.
    
 
                                       29

CONVERSION FEATURE--CLASS B SHARES
 
   
  Class B shares will automatically convert to Class A shares on a quarterly
basis approximately seven years after purchase. Conversions will be effected at
relative NAV without the imposition of any additional sales charge.
    
 
  Since the Fund tracks amounts paid rather than the number of shares bought on
each purchase of Class B shares, the number of Class B shares eligible to
convert to Class A shares (excluding shares acquired through the automatic
reinvestment of dividends and other distributions) (the Eligible Shares) will be
determined on each conversion date in accordance with the following formula: (i)
the ratio of (a) the amounts paid for Class B shares purchased at least seven
years prior to the conversion date to (b) the total amount paid for all Class B
shares purchased and then held in your account (ii) multiplied by the total
number of Class B shares purchased and then held in your account. Each time any
Eligible Shares in your account convert to Class A shares, all shares or amounts
representing Class B shares then in your account that were acquired through the
automatic reinvestment of dividends and other distributions will convert to
Class A shares.
 
   
  For purposes of determining the number of Eligible Shares, if the Class B
shares in your account on any conversion date are the result of multiple
purchases at different NAV's, the number of Eligible Shares calculated as
described above will generally be either more or less than the number of shares
actually purchased approximately seven years before such conversion date. For
example, if 100 shares were initially purchased at $10 per share (for a total of
$1,000) and a second purchase of 100 shares was subsequently made at $11 per
share (for a total of $1,100), 95.24 shares would convert approximately seven
years from the initial purchase (I.E., $1,000 divided by $2,100 (47.62%),
multiplied by 200 shares equals 95.24 shares). The Manager reserves the right to
modify the formula for determining the number of Eligible Shares in the future
as it deems appropriate on notice to shareholders.
    
 
   
  Since annual distribution-related fees are lower for Class A shares than Class
B shares, the NAV of the Class A shares may be higher than that of the Class B
shares at the time of conversion. Thus, although the aggregate dollar value will
be the same, you may receive fewer Class A shares than Class B shares converted.
See "How the Fund Values its Shares."
    
 
  For purposes of calculating the applicable holding period for conversions, all
payments for Class B shares during a month will be deemed to have been made on
the last day of the month, or for Class B shares acquired through exchange or a
series of exchanges, on the last day of the month in which the original payment
for purchases of such Class B shares was made. For Class B shares previously
exchanged for shares of a money market fund, the time period during which such
shares were held in the money market fund will be excluded. For example, Class B
shares held in a money market fund for one year will not convert to Class A
shares until approximately eight years from purchase. For purposes of measuring
the time period during which shares are held in a money market fund, exchanges
will be deemed to have been made on the last day of the month. Class B shares
acquired through exchange will convert to Class A shares after expiration of the
conversion period applicable to the original purchase of such shares.
 
   
  The conversion feature may be subject to the continuing availability of
opinions of counsel or rulings of the Internal Revenue Service (i) that the
dividends and other distributions paid on Class A, Class B and Class C shares
will not constitute preferential dividends under the Internal Revenue Code and
(ii) that the conversion of shares does not constitute a taxable event. The
conversion of Class B shares into Class A shares may be suspended if such
opinions or rulings are no longer available. If conversions are suspended, Class
B shares of the Series will continue to be subject, possibly indefinitely, to
their higher annual distribution and service fee.
    
 
HOW TO EXCHANGE YOUR SHARES
 
   
  AS A SHAREHOLDER OF THE SERIES, YOU HAVE AN EXCHANGE PRIVILEGE WITH THE OTHER
SERIES OF THE FUND AND CERTAIN OTHER PRUDENTIAL MUTUAL FUNDS, INCLUDING ONE OR
MORE SPECIFIED MONEY MARKET FUNDS, SUBJECT TO THE MINIMUM INVESTMENT
REQUIREMENTS OF SUCH FUNDS. CLASS A, CLASS B AND CLASS C SHARES OF THE SERIES
MAY BE EXCHANGED FOR CLASS A, CLASS B AND CLASS C SHARES, RESPECTIVELY, OF THE
OTHER SERIES OF THE FUND OR ANOTHER FUND ON THE BASIS OF THE RELATIVE NAV. No
    
 
                                       30

   
sales charge will be imposed at the time of the exchange. Any applicable CDSC
payable upon the redemption of shares exchanged will be calculated from the
first day of the month after the initial purchase, excluding the time shares
were held in a money market fund. Class B and Class C shares may not be
exchanged into money market funds other than Prudential Special Money Market
Fund, Inc. For purposes of calculating the holding period applicable to the
Class B conversion feature, the time period during which Class B shares were
held in a money market fund will be excluded. See "Conversion Feature--Class B
Shares" above. An exchange will be treated as a redemption and purchase for tax
purposes. See "Shareholder Investment Account--Exchange Privilege" in the
Statement of Additional Information.
    
 
   
  IN ORDER TO EXCHANGE SHARES BY TELEPHONE, YOU MUST AUTHORIZE TELEPHONE
EXCHANGES ON YOUR INITIAL APPLICATION FORM OR BY WRITTEN NOTICE TO THE TRANSFER
AGENT AND HOLD SHARES IN NON-CERTIFICATE FORM. Thereafter, you may call the Fund
at (800) 225-1852 to execute a telephone exchange of shares, weekdays, except
holidays, between the hours of 8:00 A.M. and 6:00 P.M., New York time. For your
protection and to prevent fraudulent exchanges, your telephone call will be
recorded and you will be asked to provide your personal identification number. A
written confirmation of the exchange transaction will be sent to you. NEITHER
THE FUND NOR ITS AGENTS WILL BE LIABLE FOR ANY LOSS, LIABILITY OR COST WHICH
RESULTS FROM ACTING UPON INSTRUCTIONS REASONABLY BELIEVED TO BE GENUINE UNDER
THE FOREGOING PROCEDURES. All exchanges will be made on the basis of the
relative NAV of the two funds (or series) next determined after the request is
received in good order.
    
 
  IF YOU HOLD SHARES THROUGH PRUDENTIAL SECURITIES, YOU MUST EXCHANGE YOUR
SHARES BY CONTACTING YOUR PRUDENTIAL SECURITIES FINANCIAL ADVISER.
 
  IF YOU HOLD CERTIFICATES, THE CERTIFICATES, SIGNED IN THE NAME(S) SHOWN ON THE
FACE OF THE CERTIFICATES, MUST BE RETURNED IN ORDER FOR THE SHARES TO BE
EXCHANGED. SEE "HOW TO SELL YOUR SHARES" ABOVE.
 
  You may also exchange shares by mail by writing to Prudential Mutual Fund
Services LLC, Attention: Exchange Processing, P.O. Box 15010, New Brunswick, New
Jersey 08906-5010.
 
   
  IN PERIODS OF SEVERE MARKET OR ECONOMIC CONDITIONS, THE TELEPHONE EXCHANGE OF
SHARES MAY BE DIFFICULT TO IMPLEMENT AND YOU SHOULD MAKE EXCHANGES BY MAIL BY
WRITING TO PRUDENTIAL MUTUAL FUND SERVICES LLC AT THE ADDRESS NOTED ABOVE.
    
 
   
  SPECIAL EXCHANGE PRIVILEGE. A special exchange privilege is available for
shareholders who qualify to purchase Class A shares at NAV (see "Alternative
Purchase Plan--Class A Shares--Reduction and Waiver of Initial Sales Charges"
above). Under this exchange privilege, amounts representing any Class B and
Class C shares (which are not subject to a CDSC) held in such a shareholder's
account will be automatically exchanged for Class A shares on a quarterly basis,
unless the shareholder elects otherwise. Eligibility for this exchange privilege
will be calculated on the business day prior to the date of the exchange.
Amounts representing Class B or Class C shares which are not subject to a CDSC
include the following: (1) amounts representing Class B or Class C shares
acquired pursuant to the automatic reinvestment of dividends and distributions,
(2) amounts representing the increase in the NAV above the total amount of
payments for the purchase of Class B or Class C shares and (3) amounts
representing Class B or Class C shares held beyond the applicable CDSC period.
Class B and Class C shareholders must notify the Transfer Agent either directly
or through their Dealer or the Distributor that they are eligible for this
special exchange privilege.
    
 
   
  The exchange privilege is not a right and may be suspended, terminated or
modified on 60 days' notice to shareholders.
    
 
   
  FREQUENT TRADING. The Fund and the other Prudential Mutual Funds are not
intended to serve as vehicles for frequent trading in response to short-term
fluctuations in the market. Due to the disruptive effect that market timing
investment strategies and excessive trading can have on efficient portfolio
management, each Prudential Mutual Fund, including the Fund, reserves the right
to refuse purchase orders and exchanges by any person, group or commonly
controlled accounts, if, in the Manager's sole judgment, such person, group or
accounts were following a market timing strategy or were otherwise engaging in
excessive trading (Market Timers).
    
 
                                       31

  To implement this authority to protect the Fund and its shareholders from
excessive trading, the Fund will reject all exchanges and purchases from a
Market Timer unless the Market Timer has entered into a written agreement with
the Fund or its affiliates pursuant to which the Market Timer has agreed to
abide by certain procedures, which include a daily dollar limit on trading. The
Fund may notify the Market Timer of rejection of an exchange or purchase order
subsequent to the day on which the order was placed.
 
SHAREHOLDER SERVICES
 
   
  In addition to the exchange privilege, as a shareholder in the Series, you can
take advantage of the following services and privileges:
    
 
   
  - AUTOMATIC REINVESTMENT OF DIVIDENDS AND/OR DISTRIBUTIONS WITHOUT A SALES
CHARGE. For your convenience, all dividends and distributions are automatically
reinvested in full and fractional shares of the Series at NAV without a sales
charge. You may direct the Transfer Agent in writing not less than 5 full
business days prior to the record date to have subsequent dividends and/or
distributions sent in cash rather than reinvested. If you hold shares through
your Dealer, you should contact your Dealer.
    
 
   
  - AUTOMATIC INVESTMENT PLAN (AIP). Under AIP you may make regular purchases of
the Series' shares in amounts as little as $50 via an automatic charge to a bank
account or brokerage account (including a Command Account). For additional
information about this service, you may contact the Distributor, your Dealer or
the Transfer Agent directly.
    
 
   
  - THE PRUTECTOR PROGRAM-OPTIONAL GROUP TERM LIFE INSURANCE. Prudential makes
available optional group term life insurance coverage to purchasers of shares of
certain Prudential Mutual Funds which are held in an eligible brokerage account.
This insurance protects the value of your mutual fund investment for your
beneficiaries against market downturns. The insurance benefit is based on the
difference at the time of the insured's death between the protected value and
the then current market value of the shares. This coverage is not available in
all states and is subject to various restrictions and limitations. For more
complete information about this program, including charges and expenses, please
contact your Prudential representative.
    
 
  - SYSTEMATIC WITHDRAWAL PLAN. A systematic withdrawal plan is available to
shareholders which provides for monthly or quarterly checks. Withdrawals of
Class B and Class C shares may be subject to a CDSC. See "How to Sell Your
Shares-- Contingent Deferred Sales Charges" above.
 
  - REPORTS TO SHAREHOLDERS. The Fund will send you annual and semi-annual
reports. The financial statements appearing in annual reports are audited by
independent accountants. In order to reduce duplicate mailing and printing
expenses, the Fund will provide one annual and semi-annual shareholder report
and annual prospectus per household. You may request additional copies of such
reports by calling (800) 225-1852 or by writing to the Fund at Gateway Center
Three, 100 Mulberry Street, Newark, New Jersey 07102-4077. In addition, monthly
unaudited financial data is available upon request from the Fund.
 
   
  - SHAREHOLDER INQUIRIES. Inquiries should be addressed to the Fund at Gateway
Center Three, 100 Mulberry Street, Newark, New Jersey 07102-4077, or by
telephone, at (800) 225-1852 (toll-free) or, from outside the U.S.A., at (732)
417-7555 (collect).
    
 
  For additional information regarding the services and privileges described
above, see "Shareholder Investment Account" in the Statement of Additional
Information.
 
                                       32

                        DESCRIPTION OF SECURITY RATINGS
 
MOODY'S INVESTORS SERVICE
 
BOND RATINGS
 
  Aaa: Bonds which are rated Aaa are judged to be of the best quality. They
carry the smallest degree of investment risk and are generally referred to as
"gilt edged." Interest payments are protected by a large or by an exceptionally
stable margin and principal is secure. While the various protective elements are
likely to change, such changes as can be visualized are most unlikely to impair
the fundamentally strong position of such issues.
 
   
  Aa: Bonds which are rated Aa are judged to be of high quality by all
standards. Together with the Aaa group, they comprise what are generally known
as high-grade bonds. They are rated lower than the best bonds because margins of
protection may not be as large as in Aaa securities or fluctuation of protective
elements may be of greater amplitude or there may be other elements present
which make the long-term risks appear somewhat larger than the Aaa securities.
    
 
  A: Bonds which are rated A possess many favorable investment attributes and
are to be considered as upper-medium-grade obligations. Factors giving security
to principal and interest are considered adequate but elements may be present
which suggest a susceptibility to impairment sometime in the future.
 
   
  Baa: Bonds which are rated Baa are considered as medium grade obligations,
(I.E., they are neither highly protected nor poorly secured). Interest payments
and principal security appear adequate for the present, but certain protective
elements may be lacking or may be characteristically unreliable over any great
length of time. Such bonds lack outstanding investment characteristics and in
fact have speculative characteristics as well.
    
 
  Ba: Bonds which are rated Ba are judged to have speculative elements; their
future cannot be considered as well assured. Often the protection of interest
and principal payments may be very moderate, and thereby not well safeguarded
during both good and bad times over the future. Uncertainty of position
characterizes bonds in this class.
 
  B: Bonds which are rated B generally lack characteristics of the desirable
investment. Assurance of interest and principal payments or of maintenance of
other terms of the contract over any long period of time may be small.
 
  Caa: Bonds which are rated Caa are of poor standing. Such issues may be in
default or there may be present elements of danger with respect to principal or
interest.
 
  Ca: Bonds which are rated Ca represent obligations which are speculative in a
high degree. Such issues are often in default or have other marked shortcomings.
 
  C: Bonds which are rated C are the lowest-rated class of bonds, and issues so
rated can be regarded as having extremely poor prospects of ever attaining any
real investment standing.
 
SHORT-TERM RATINGS
 
  Moody's ratings for tax-exempt notes and other short-term loans are designated
Moody's Investment Grade (MIG). This distinction is in recognition of the
differences between short-term and long-term credit risk.
 
  MIG 1: Loans bearing the designation MIG 1 are of the best quality, enjoying
strong protection by established cash flows, superior liquidity support or
demonstrated broad-based access to the market for refinancing.
 
  MIG 2: Loans bearing the designation MIG 2 are of high quality, with margins
of protection ample although not so large as in the preceding group.
 
                                      A-1

  MIG 3: Loans bearing the designation MIG 3 are of favorable quality, with all
security elements accounted for but lacking the strength of the preceding
grades.
 
   
  MIG 4: Loans bearing the designation MIG 4 are of adequate quality. Protection
commonly regarded and required of an investment security is present and although
not distinctly or predominantly speculative, there is specific risk.
    
 
   
  SG: This designation denotes speculative quality. Debt instruments in this
category lack margins of protection.
    
 
   
SHORT-TERM DEBT RATINGS
    
 
   
  Moody's short-term debt ratings are opinions of the ability of issuers to
repay punctually senior debt obligations. These obligations have an original
maturity not exceeding one year, unless explicitly noted.
    
 
   
  PRIME-1: Issuers rated "Prime-1" (or supporting institutions) have a superior
ability for repayment of senior short-term debt obligations. Prime-1 repayment
ability will often be evidenced by many of the following characteristics:
    
 
   
  - Leading market positions in well-established industries.
    
 
   
  - High rates of return on funds employed.
    
 
   
  - Conservative capitalization structure with moderate reliance on debt and
  ample asset protection.
    
 
   
  - Broad margins in earnings coverage of fixed financial charges and high
  internal cash generation.
    
 
   
  - Well-established access to a range of financial markets and assured
  sources of alternate liquidity.
    
 
   
  PRIME-2: Issuers rated "Prime-2" (or supporting institutions) have a strong
ability for repayment of senior short-term debt obligations. This normally will
be evidenced by many of the characteristics cited above but to a lesser degree.
Earnings trends and coverage ratios, while sound, may be more subject to
variation. Capitalization characteristics, while still appropriate, may be more
affected by external conditions. Ample alternate liquidity is maintained.
    
 
  PRIME-3: Issuers rated Prime-3 (or supporting institutions) have an acceptable
ability for repayment of senior short-term debt obligations.
 
   
  NOT PRIME: Issuers rated Not Prime do not fall within any of the Prime rating
categories.
    
 
   
STANDARD & POOR'S RATINGS GROUP
    
 
   
DEBT RATINGS
    
 
   
  AAA: An obligation rated AAA has the highest rating assigned by S&P. The
obligor's capacity to meet its financial commitment on the obligation is
extremely strong.
    
 
   
  AA: An obligation rated AA differs from the highest rated obligations only in
small degree. The obligor's capacity to meet its financial commitment on the
obligation is very strong.
    
 
   
  A: An obligation rated A is somewhat more susceptible to the adverse effects
of changes in circumstances and economic conditions than obligations in
higher-rated categories. However, the obligor's capacity to meet its financial
commitment on the obligation is still strong.
    
 
   
  BBB: An obligation rated BBB exhibits adequate protection parameters. However,
adverse economic conditions or changing circumstances are more likely to lead to
a weakened capacity of the obligor to meet its financial commitment on the
obligation.
    
 
   
  BB, B, CCC, CC AND C: Obligations rated BB, B, CCC, CC and C are regarded as
having significant speculative characteristics. BB indicates the least degree of
speculation and C the highest. While such obligations will likely have some
quality and protective characteristics, these may be outweighed by large
uncertainties or major exposures to adverse conditions.
    
 
                                      A-2

  D: Debt rated D is in payment default. This rating is used when interest
payments or principal payments are not made on the date due even if the
applicable grace period has not expired, unless S&P believes that such payments
will be made during such grace period.
 
COMMERCIAL PAPER RATINGS
 
  An S&P Commercial Paper rating is a current assessment of the likelihood of
timely payment of debt considered short-term in the relevant market.
 
   
  A-1: This designation indicates that the degree of safety regarding timely
payment is strong. Those issues determined to possess extremely strong safety
characteristics are denoted with a plus sign (+) designation.
    
 
   
  A-2: Capacity for timely payment on issues with this designation is
satisfactory. However, the relative degree of safety is not as high as for
issues designated A-1.
    
 
  A-3: Issues carrying this designation have adequate capacity for timely
payment. They are, however, more vulnerable to the adverse effects of changes in
circumstances than obligations carrying the higher designations.
 
MUNICIPAL NOTES
 
  A municipal note rating reflects the liquidity concerns and market access
risks unique to municipal notes. Municipal notes due in three years or less will
likely receive a municipal note rating, while notes maturing beyond three years
will most likely receive a long-term debt rating. Municipal notes are rated
SP-1, SP-2 or SP-3. The designation SP-1 indicates a very strong capacity to pay
principal and interest. Those issues determined to possess extremely strong
safety characteristics are denoted with a plus sign (+) designation. An SP-2
designation indicates a satisfactory capacity to pay principal and interest. An
SP-3 designation indicates speculative capacity to pay principal and interest.
 
                                      A-3

                       THE PRUDENTIAL MUTUAL FUND FAMILY
 
   
  Prudential offers a broad range of mutual funds designed to meet your
individual needs. We welcome you to review the investment options available
through our family of funds. For more information on the Prudential Mutual
Funds, including charges and expenses, contact your Prudential Securities
financial adviser or Prusec representative or telephone the Funds at (800)
225-1852 for a free prospectus. Read the prospectus carefully before you invest
or send money.
    
 
      TAXABLE BOND FUNDS
    --------------------------
 
   
Prudential Diversified Bond Fund, Inc.
Prudential Government Income Fund, Inc.
Prudential Government Securities Trust
    Short-Intermediate Term Series
Prudential High Yield Fund, Inc.
Prudential High Yield Total Return Fund, Inc.
Prudential Mortgage Income Fund, Inc.
Prudential Structured Maturity Fund, Inc.
    Income Portfolio
    
 
      TAX-EXEMPT BOND FUNDS
    -----------------------------
 
   
Prudential California Municipal Fund
    California Series
    California Income Series
Prudential Municipal Bond Fund
    High Income Series
    Insured Series
    Intermediate Series
Prudential Municipal Series Fund
    Florida Series
    Maryland Series
    Massachusetts Series
    Michigan Series
    New Jersey Series
    New York Series
    North Carolina Series
    Ohio Series
    Pennsylvania Series
Prudential National Municipals Fund, Inc.
    
 
      GLOBAL FUNDS
    --------------------
 
   
Prudential Developing Markets Fund
    Prudential Developing Markets Equity Fund
    Prudential Latin America Equity Fund
Prudential Europe Growth Fund, Inc.
Prudential Global Genesis Fund, Inc.
Prudential Global Limited Maturity Fund, Inc.
    Limited Maturity Portfolio
Prudential Intermediate Global Income Fund, Inc.
Prudential International Bond Fund, Inc.
Prudential Natural Resources Fund, Inc.
Prudential Pacific Growth Fund, Inc.
Prudential World Fund, Inc.
    Global Series
    International Stock Series
Global Utility Fund, Inc.
The Global Total Return Fund, Inc.
    
 
      EQUITY FUNDS
    --------------------
   
Prudential Balanced Fund
Prudential Distressed Securities Fund, Inc.
Prudential Emerging Growth Fund, Inc.
Prudential Equity Fund, Inc.
Prudential Equity Income Fund
Prudential Index Series Fund
    Prudential Bond Market Index Fund
    Prudential Europe Index Fund
    Prudential Pacific Index Fund
    Prudential Small-Cap Index Fund
    Prudential Stock Index Fund
The Prudential Investment Portfolios, Inc.
    Prudential Active Balanced Fund
    Prudential Jennison Growth Fund
    Prudential Jennison Growth & Income Fund
Prudential Mid-Cap Value Fund
Prudential Real Estate Securities Fund, Inc.
Prudential Small-Cap Quantum Fund, Inc.
Prudential Small Company Value Fund, Inc.
Prudential Utility Fund, Inc.
Prudential 20/20 Focus Fund
Nicholas-Applegate Fund, Inc.
    Nicholas-Applegate Growth Equity Fund
    
 
      MONEY MARKET FUNDS
    --------------------------
   
- - TAXABLE MONEY MARKET FUNDS
Cash Accumulation Trust
    Liquid Assets Fund
    National Money Market Fund
Prudential Government Securities Trust
    Money Market Series
    U.S. Treasury Money Market Series
Prudential Special Money Market Fund, Inc.
    Money Market Series
Prudential MoneyMart Assets, Inc.
    
 
- - TAX-FREE MONEY MARKET FUNDS
Prudential Tax-Free Money Fund, Inc.
Prudential California Municipal Fund
    California Money Market Series
Prudential Municipal Series Fund
    Connecticut Money Market Series
    Massachusetts Money Market Series
    New Jersey Money Market Series
    New York Money Market Series
 
- - COMMAND FUNDS
Command Money Fund
Command Government Fund
Command Tax-Free Fund
 
- - INSTITUTIONAL MONEY MARKET FUNDS
Prudential Institutional Liquidity Portfolio, Inc.
    Institutional Money Market Series
 
                                      B-1

   
No Dealer, sales representative or any other person has been authorized to give
any information or to make any representations, other than those contained in
this Prospectus, in connection with the offer contained herein, and, if given or
made, such other information or representations must not be relied upon as
having been authorized by the Fund or the Distributor. This Prospectus does not
constitute an offer by the Fund or by the Distributor to sell or a solicitation
of any offer to buy any of the securities offered hereby in any jurisdiction to
any person to whom it is unlawful to make such offer in such jurisdiction.
    
 
- -------------------------------------------
 
                               TABLE OF CONTENTS
 
   


                                                                              PAGE
                                                                              ----
                                                                           
FUND HIGHLIGHTS.............................................................    2
  What are the Series' Risk Factors and Special Characteristics?............    2
FUND EXPENSES...............................................................    4
FINANCIAL HIGHLIGHTS........................................................    5
HOW THE FUND INVESTS........................................................    8
  Investment Objective and Policies.........................................    8
  Other Investments and Policies............................................   14
  Investment Restrictions...................................................   14
HOW THE FUND IS MANAGED.....................................................   15
  Manager...................................................................   15
  Fee Waivers and Subsidy...................................................   15
  Distributor...............................................................   15
  Portfolio Transactions....................................................   17
  Custodian and Transfer and Dividend Disbursing Agent......................   17
  Year 2000.................................................................   17
HOW THE FUND VALUES ITS SHARES..............................................   18
HOW THE FUND CALCULATES PERFORMANCE.........................................   18
TAXES, DIVIDENDS AND DISTRIBUTIONS..........................................   19
GENERAL INFORMATION.........................................................   21
  Description of Shares.....................................................   21
  Additional Information....................................................   22
SHAREHOLDER GUIDE...........................................................   22
  How to Buy Shares of the Fund.............................................   22
  Alternative Purchase Plan.................................................   24
  How to Sell Your Shares...................................................   27
  Conversion Feature--Class B Shares........................................   30
  How to Exchange Your Shares...............................................   30
  Shareholder Services......................................................   32
DESCRIPTION OF SECURITY RATINGS.............................................  A-1
THE PRUDENTIAL MUTUAL FUND FAMILY...........................................  B-1

    
 
- -------------------------------------------
 
   
MF125A
    
 
                                       Class A:    74435M-70-5
                        CUSIP Nos.:    Class B:    74435M-80-4
                                       Class C:    74435M-57-2
 
PRUDENTIAL
MUNICIPAL
SERIES FUND
- -----------
 
MARYLAND SERIES
 
   
                         PROSPECTUS
 November 2, 1998
www.prudential.com
    
 
                --------------------------
 
         [LOGO]

Prudential Municipal Series Fund
(Michigan Series)
 
- ----------------------------------------------
   
PROSPECTUS DATED NOVEMBER 2, 1998
    
- ----------------------------------------------------------------
 
Prudential Municipal Series Fund (the Fund) (Michigan Series) (the Series) is
one of thirteen series of an open-end, management investment company, or mutual
fund. This Series is diversified and is designed to provide the maximum amount
of income that is exempt from Michigan State and federal income taxes consistent
with the preservation of capital and, in conjunction therewith, the Series may
invest in debt securities with the potential for capital gain. The net assets of
the Series are invested primarily in obligations within the four highest ratings
of Moody's Investors Service, Standard & Poor's Ratings Group or another
nationally recognized statistical rating organization or in unrated obligations
which, in the opinion of the Fund's investment adviser, are of comparable
quality. The Series may, however, also invest a portion of its assets in
lower-quality municipal obligations or in non-rated securities which, in the
opinion of the Fund's investment adviser, are of comparable quality. Subject to
the limitations described herein, the Series may utilize derivatives, including
buying and selling futures contracts and options thereon for the purpose of
hedging its portfolio securities. There can be no assurance that the Series'
investment objective will be achieved. See "How the Fund Invests--Investment
Objective and Policies." The Fund's address is Gateway Center Three, 100
Mulberry Street, Newark, New Jersey 07102-4077, and its telephone number is
(800) 225-1852.
 
   
The Trustees of the Fund have recently approved a proposal to exchange the
assets and liabilities of the Series of the Fund for shares of Prudential
National Municipals Fund, Inc. (National Municipals Fund). Class A, Class B and
Class C shares of the Series would be exchanged at relative net asset value for
Class A shares of National Municipals Fund. The transfer has been approved by
the Trustees of the Fund and by the Board of Directors of National Municipals
Fund and is subject to approval by the shareholders of the Series. It is
anticipated that a proxy statement/prospectus relating to the transaction will
have been mailed to the Series' shareholders in late October 1998. EFFECTIVE
IMMEDIATELY, THE FUND WILL NO LONGER ACCEPT ORDERS TO PURCHASE OR EXCHANGE FOR
SHARES OF THE SERIES, EXCEPT FOR PURCHASES BY CERTAIN RETIREMENT AND EMPLOYEE
PLANS (EXCLUDING IRA ACCOUNTS). Existing shareholders may continue to acquire
shares through dividend reinvestment. The current redemption privilege and the
current exchange privilege of obtaining shares of other Prudential Mutual Funds
will remain in effect until the transaction is consummated. If the transaction
is not consummated, the Fund will resume accepting orders to purchase or
exchange for shares of the Series. See "Shareholder Guide--How to Buy Shares of
the Fund."
    
 
   
This Prospectus sets forth concisely the information about the Fund and the
Michigan Series that a prospective investor should know before investing and is
available at the Web site of the Prudential Insurance Company of America
(http://www.prudential.com). Additional information about the Fund has been
filed with the Securities and Exchange Commission (the Commission) in a
Statement of Additional Information dated November 2, 1998, which information is
incorporated herein by reference (is legally considered a part of this
Prospectus) and is available without charge upon request to the Fund at the
address or telephone number noted above. The Commission maintains a Web site
(http://www.sec.gov) that contains the Statement of Additional Information,
material incorporated by reference and other information regarding the Fund.
    
 
- --------------------------------------------------------------------------------
 
INVESTORS ARE ADVISED TO READ THIS PROSPECTUS AND RETAIN IT FOR FUTURE
REFERENCE.
- --------------------------------------------------------------------------------
 
   
AN INVESTMENT IN THE FUND IS NOT A DEPOSIT OF ANY BANK AND IS NOT INSURED OR
GUARANTEED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION OR ANY OTHER GOVERNMENT
AGENCY.
    
 
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION NOR HAS THE SECURITIES AND EXCHANGE COMMISSION PASSED UPON
THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY
IS A CRIMINAL OFFENSE.

                                FUND HIGHLIGHTS
 
  The following summary is intended to highlight certain information contained
in this Prospectus and is qualified in its entirety by the more detailed
information appearing elsewhere herein.
 
  WHAT IS PRUDENTIAL MUNICIPAL SERIES FUND?
 
    Prudential Municipal Series Fund is a mutual fund whose shares are offered
  in thirteen series, each of which operates as a separate fund. A mutual fund
  pools the resources of investors by selling its shares to the public and
  investing the proceeds of such sale in a portfolio of securities designed to
  achieve its investment objective. Technically, the Fund is an open-end,
  management investment company. Only the Michigan Series is offered through
  this Prospectus.
 
  WHAT IS THE SERIES' INVESTMENT OBJECTIVE?
 
    The Series' investment objective is to maximize current income that is
  exempt from Michigan State and federal income taxes consistent with the
  preservation of capital. It seeks to achieve this objective by investing
  primarily in Michigan State, municipal and local government obligations and
  obligations of other qualifying issuers, such as issuers located in Puerto
  Rico, the Virgin Islands and Guam, which pay income exempt, in the opinion
  of counsel, from Michigan State and federal income taxes (Michigan
  Obligations). There can be no assurance that the Series' investment
  objective will be achieved. See "How the Fund Invests--Investment Objective
  and Policies" at page 8.
 
  WHAT ARE THE SERIES' RISK FACTORS AND SPECIAL CHARACTERISTICS?
 
   
    In seeking to achieve its investment objective, the Series will invest at
  least 80% of the value of its total assets in Michigan Obligations. This
  degree of investment concentration makes the Series particularly susceptible
  to factors adversely affecting issuers of Michigan Obligations. See "How the
  Fund Invests--Investment Objective and Policies-- Special Considerations" at
  page 13. The Series may invest up to 30% of its total assets in high yield
  securities, commonly known as junk bonds, which may be considered
  speculative and are subject to the risk of an issuer's inability to meet
  principal and interest payments on the obligations as well as price
  volatility. See "How the Fund Invests--Investment Objective and
  Policies--Risk Factors Relating to Investing in High Yield Municipal
  Obligations" at page 11. To hedge against changes in interest rates, the
  Series may also purchase put options and engage in transactions involving
  derivatives, including financial futures contracts and options thereon. See
  "How the Fund Invests--Investment Objective and Policies--Futures Contracts
  and Options Thereon" at page 12. As with an investment in any mutual fund,
  an investment in this Series can decrease in value and you can lose money.
    
 
  WHO MANAGES THE FUND?
 
   
    Prudential Investments Fund Management LLC (PIFM or the Manager) is the
  Manager of the Fund and is compensated for its services at an annual rate of
  .50 of 1% of the Series' average daily net assets. As of September 30, 1998,
  PIFM served as manager or administrator to 66 investment companies,
  including 44 mutual funds, with aggregate assets of approximately $67
  billion. The Prudential Investment Corporation (PIC, the Subadviser or the
  investment adviser), furnishes investment advisory services in connection
  with the management of the Fund under a Subadvisory Agreement with PIFM. See
  "How the Fund is Managed--Manager" at page 14.
    
 
  WHO DISTRIBUTES THE SERIES' SHARES?
 
   
    Prudential Investment Management Services LLC (the Distributor) acts as
  the Distributor of the Series' Class A, Class B and Class C shares and is
  paid a distribution and service fee with respect to Class A shares at the
  annual rate of .25 of 1% of the average daily net assets of the Class A
  shares and is paid a distribution and service fee with respect to Class B
  shares at the annual rate of .50 of 1% of the average daily net assets of
  the Class B shares and is paid an annual distribution and service fee with
  respect to Class C shares which is currently being charged at the rate of
  .75 of 1% of the average daily net assets of the Class C shares. See "How
  the Fund is Managed--Distributor" at page 15.
    
 
                                       2

  WHAT IS THE MINIMUM INVESTMENT?
 
   
    The minimum initial investment is $1,000 for Class A and Class B shares
  and $2,500 for Class C shares. The minimum subsequent investment is $100 for
  Class A, Class B and Class C shares. There is no minimum investment
  requirement for certain employee savings plans. For purchases made through
  the Automatic Investment Plan, the minimum initial and subsequent investment
  is $50. See "Shareholder Guide--How to Buy Shares of the Fund" at page 22
  and "Shareholder Guide--Shareholder Services" at page 31.
    
 
  HOW DO I PURCHASE SHARES?
 
   
    You may purchase shares of the Series through the Distributor or brokers
  or dealers that have entered into agreements to act as participating or
  introducing brokers for the Distributor (Dealers) or directly from the Fund
  through its transfer agent, Prudential Mutual Fund Services LLC. (PMFS or
  the Transfer Agent). In each case, sales are made at the net asset value per
  share (NAV) next determined after receipt of your purchase order by the
  Transfer Agent, a Dealer or the Distributor plus a sales charge, which may
  be imposed at the time of purchase, on a deferred basis, or both. Class A
  shares are sold with a front-end sales charge. Class B shares are subject to
  a contingent-deferred sales charge (CDSC). Class C shares are sold with a
  low front-end sales charge, but are also subject to a CDSC. Dealers may
  charge their customers a separate fee for handling purchase transactions.
  See "How the Fund Values its Shares" at page 17 and "Shareholder Guide--How
  to Buy Shares of the Fund" at page 22.
    
 
  WHAT ARE MY PURCHASE ALTERNATIVES?
 
    The Series offers three classes of shares:
 
     - Class A Shares:   Sold with an initial sales charge of up to 3% of
                         the offering price.
 
     - Class B Shares:   Sold without an initial sales charge but are
                         subject to a contingent deferred sales charge or
                         CDSC (declining from 5% to zero of the lower of the
                         amount invested or the redemption proceeds) which
                         will be imposed on certain redemptions made within
                         six years of purchase. Although Class B shares are
                         subject to higher ongoing distribution-related
                         expenses than Class A shares, Class B shares will
                         automatically convert to Class A shares (which are
                         subject to lower ongoing distribution-related
                         expenses) approximately seven years after purchase.
 
   
     - Class C Shares:   Sold with an initial sales charge of 1% of the
                         offering price and are also subject to a CDSC of 1%
                         on redemptions for a period of 18 months after
                         purchase. Class C shares are subject to higher
                         ongoing distribution-related expenses than Class A
                         shares but, unlike Class B shares, do not convert
                         to another class.
    
 
    See "Shareholder Guide--Alternative Purchase Plan" at page 23.
 
  HOW DO I SELL MY SHARES?
 
   
    You may redeem your shares at any time at the NAV next determined after
  your Dealer, the Distributor or the Transfer Agent receives your sell order.
  The proceeds of redemptions of Class B and Class C shares may be subject to
  a CDSC. Dealers may charge their customers a separate fee for handling sale
  transactions. See "Shareholder Guide--How to Sell Your Shares" at page 26.
    
 
  HOW ARE DIVIDENDS AND DISTRIBUTIONS PAID?
 
   
    The Series expects to declare daily and pay monthly dividends of net
  investment income, if any, and make distributions of any net capital gains
  at least annually. Dividends and distributions will be automatically
  reinvested in additional shares of the Series at NAV without a sales charge
  unless you request that they be paid to you in cash. See "Taxes, Dividends
  and Distributions" at page 18.
    
 
                                       3

                                 FUND EXPENSES
                               (MICHIGAN SERIES)
 
   


                                         CLASS A SHARES  CLASS B SHARES  CLASS C SHARES
                                         --------------  --------------  --------------
                                                                
SHAREHOLDER TRANSACTION EXPENSES+
    Maximum Sales Load Imposed on
     Purchases (as a percentage of
     offering price)...................        3%             None             1%
    Maximum Deferred Sales Load (as a
     percentage of original purchase
     price or redemption proceeds,
     whichever is lower)...............       None       5% during the       1% on
                                                          first year,     redemptions
                                                         decreasing by   made within 18
                                                         1% annually to    months of
                                                           1% in the        purchase
                                                           fifth and
                                                          sixth years
                                                           and 0% the
                                                         seventh year*
    Maximum Sales Load Imposed on
     Reinvested Dividends..............       None            None            None
    Redemption Fees....................       None            None            None
    Exchange Fee.......................       None            None            None

    
 
   


                                           CLASS A SHARES      CLASS B SHARES      CLASS C SHARES
                                           ---------------     ---------------     ---------------
                                                                          
ANNUAL FUND OPERATING EXPENSES
(as a percentage of average net assets)
    Management Fees....................               .50%                .50%                .50%
    12b-1 Fees (After Reduction).......               .25%++              .50%++              .75%++
    Other Expenses.....................               .32%                .32%                .32%
                                                  -------             -------             -------
    Total Fund Operating Expenses
     (After Reduction).................              1.07%               1.32%               1.57%
                                                  -------             -------             -------
                                                  -------             -------             -------

    
 
   


                                         1 YEAR  3 YEARS  5 YEARS  10 YEARS
                                         ------  -------  -------  --------
                                                       
EXAMPLE
You would pay the following expenses on
  a $1,000 investment, assuming (1) 5%
  annual return and (2) redemption at
  the end of each time period:
    Class A............................  $  41   $   63   $   87   $   157
    Class B............................  $  63   $   72   $   82   $   149
    Class C............................  $  36   $   59   $   95   $   195
You would pay the following expenses on
  the same investment, assuming no
  redemption:
    Class A............................  $  41   $   63   $   87   $   157
    Class B............................  $  13   $   42   $   72   $   149
    Class C............................  $  26   $   59   $   95   $   195

    
 
   
   THE EXAMPLES SHOULD NOT BE CONSIDERED A REPRESENTATION OF PAST OR FUTURE
   EXPENSES. ACTUAL EXPENSES MAY BE GREATER OR LESS THAN THOSE SHOWN.
    
 
   
   The purpose of this table is to assist investors in understanding the
   various costs and expenses that an investor in the Series will bear,
   whether directly or indirectly. For more complete descriptions of the
   various costs and expenses, see "How the Fund is Managed." The above
   examples are based on restated data for the Series' fiscal year ended
   August 31, 1998. "Other Expenses" includes Trustees' and professional
   fees, registration fees, reports to shareholders and transfer agency and
   custodian fees.
    
- ---------------
 
   
*  Class B shares will automatically convert to Class A shares approximately
       seven years after purchase. See "Shareholder Guide--Conversion Feature--
       Class B Shares."
    
 
   
+  Dealers independently may charge additional fees for shareholder transactions
       or advisory services. Pursuant to rules of the National Association of
       Securities Dealers, Inc., the aggregate initial sales charges, deferred
       sales charges and asset-based sales charges on shares of the Series may
       not exceed 6.25% of total gross sales, subject to certain exclusions.
       This 6.25% limitation is imposed on each class of the Series rather than
       on a per shareholder basis. Therefore, long-term shareholders of the
       Series may pay more in total sales charges than the economic equivalent
       of 6.25% of such shareholders' investment in such shares. See "How the
       Fund is Managed--Distributor."
    
 
   
++  Although the Class A, Class B and Class C Distribution and Service Plans
       provide that the Fund may pay a distribution fee of up to .30 of 1%, .50
       of 1% and 1% per annum of the average daily net assets of the Class A,
       Class B and Class C shares, respectively, the Distributor may voluntarily
       limit its distribution fees. Presently the Distributor limits its
       distribution fees with respect to the Class A, Class B and Class C shares
       of the Series to no more than .10 of 1%, .10 of 1% and .25 of 1% of the
       average daily net asset value of the Class A, Class B and Class C shares,
       respectively. This voluntary limitation may be modified or terminated at
       any time without notice. The Distributor anticipates modifying its
       present limitation for Class A and Class C shares so that, in the future,
       the Fund will pay distribution fees of .25% and .75%, respectively, and
       eliminating its present limitation for Class B shares so that, in the
       future, the Fund will pay distribution fees of .50%. Total Fund Operating
       Expenses of the Class A and Class C shares without any limitations would
       be 1.12% and 1.82%, respectively. See "How the Fund is
       Managed--Distributor."
    
 
                                       4

                              FINANCIAL HIGHLIGHTS
(FOR A SHARE OF BENEFICIAL INTEREST OUTSTANDING THROUGHOUT EACH OF THE INDICATED
                                    PERIODS)
                                (CLASS A SHARES)
 
   
  The following financial highlights, for the two years ended August 31, 1998,
have been audited by PricewaterhouseCoopers LLP, independent accountants, and
for the three years ended August 31, 1996 have been audited by other independent
auditors. All such audit reports were unqualified. This information should be
read in conjunction with the financial statements and the notes thereto, which
appear in the Statement of Additional Information. The following financial
highlights contain selected data for a Class A share of beneficial interest
outstanding, total return, ratios to average net assets and other supplemental
data for the periods indicated. This information is based on data contained in
the financial statements. Further performance information is contained in the
annual report, which may be obtained without charge. See "Shareholder
Guide--Shareholder Services--Reports to Shareholders."
    
 
   


                                                                          CLASS A
                             -------------------------------------------------------------------------------------------------
                                                                                                                   JANUARY 22,
                                                                                                                    1990 (a)
                                                            YEAR ENDED AUGUST 31,                                    THROUGH
                             -----------------------------------------------------------------------------------   AUGUST 31,
                              1998       1997       1996       1995       1994       1993       1992       1991       1990
                             ------     ------     ------     ------     ------     ------     ------     ------   -----------
                                                                                        
 
PER SHARE OPERATING
  PERFORMANCE:
Net asset value,
  beginning of period....    $12.01     $11.72     $11.89     $11.75     $12.51     $11.90     $11.30     $10.81      $11.02
                             ------     ------     ------     ------     ------     ------     ------     ------   -----------
INCOME FROM INVESTMENT
  OPERATIONS
Net investment income....       .60        .61(e)     .62(e)     .64(e)     .64        .67        .68        .67        .41
Net realized and
  unrealized gain (loss)
  on investment
  transactions...........       .43        .33       (.02)       .17       (.69)       .71        .60        .49       (.21)
                             ------     ------     ------     ------     ------     ------     ------     ------   -----------
Total from investment
  operations.............      1.03        .94        .60        .81       (.05)      1.38       1.28       1.16        .20
                             ------     ------     ------     ------     ------     ------     ------     ------   -----------
LESS DISTRIBUTIONS
Dividends from net
  investment income......      (.60)      (.61)      (.62)      (.64)      (.64)      (.67)      (.68)      (.67)      (.41)
Distributions in excess
  of net
  investment income......        --(f)      --(f)      --         --         --         --         --         --         --
Distributions from net
  realized gains.........      (.07)      (.04)      (.15)      (.03)      (.07)      (.10)        --         --         --
                             ------     ------     ------     ------     ------     ------     ------     ------   -----------
Total distributions......      (.67)      (.65)      (.77)      (.67)      (.71)      (.77)      (.68)      (.67)      (.41)
                             ------     ------     ------     ------     ------     ------     ------     ------   -----------
Net asset value, end of
  period.................    $12.37     $12.01     $11.72     $11.89     $11.75     $12.51     $11.90     $11.30      $10.81
                             ------     ------     ------     ------     ------     ------     ------     ------   -----------
                             ------     ------     ------     ------     ------     ------     ------     ------   -----------
TOTAL RETURN (c):........      8.81%      8.18%      5.07%      7.13%     (0.38)%    11.95%     11.63%     11.04%      1.82%
RATIOS/SUPPLEMENTAL DATA:
Net assets, end of period
  (000)..................    $30,248    $29,772    $28,730    $27,024    $4,706     $3,814     $1,618     $  835      $ 501
Average net assets
  (000)..................    $30,330    $29,737    $27,978    $16,932    $4,505     $2,285     $1,235     $  694      $ 365
Ratios to average net
  assets:
  Expenses, including
   distribution fee......       .92%       .91%(e)    .91%(e)   1.02%(e)    .91%       .96%(d)    .98%      1.09%      1.09%(b)
  Expenses, excluding
   distribution fee......       .82%       .81%(e)    .81%(e)    .92%(e)    .81%       .86%(d)    .88%       .99%       .99%(b)
  Net investment
   income................      4.90%      5.08%(e)   5.18%(e)   5.31%(e)   5.27%      5.51%(d)   5.82%      6.09%      6.25%(b)
Portfolio turnover
  rate...................        29%        20%        36%        33%        12%        14%        30%        62%        55%

    
 
- ---------------
   (a)  Commencement of offering of Class A shares.
 
   (b)  Annualized.
 
   (c)  Total return does not consider the effects of sales loads. Total
        return is calculated assuming a purchase of shares on the first day
        and a sale on the last day of each period reported and includes
        reinvestment of dividends and distributions. Total returns for
        periods of less than a full year are not annualized.
 
   (d)  Restated.
 
   
   (e)  Net of management fee waiver. Effective September 1, 1997, PIFM
        eliminated its management fee waiver (.05 of 1%).
    
 
   (f)  Less than $.005 per share.
 
                                       5

                              FINANCIAL HIGHLIGHTS
(FOR A SHARE OF BENEFICIAL INTEREST OUTSTANDING THROUGHOUT EACH OF THE INDICATED
                                    PERIODS)
                                (CLASS B SHARES)
 
   
  The following financial highlights, for the two years ended August 31, 1998,
have been audited by PricewaterhouseCoopers LLP, independent accountants, and
for the three years ended August 31, 1996 have been audited by other independent
auditors. All such audit reports were unqualified. This information should be
read in conjunction with the financial statements and the notes thereto, which
appear in the Statement of Additional Information. The following financial
highlights contain selected data for a Class B share of beneficial interest
outstanding, total return, ratios to average net assets and other supplemental
data for the periods indicated. This information is based on data contained in
the financial statements. Further performance information is contained in the
annual report, which may be obtained without charge. See "Shareholder
Guide--Shareholder Services--Reports to Shareholders."
    
 
   


                                                                       CLASS B
                     -----------------------------------------------------------------------------------------------------------
                                                                YEAR ENDED AUGUST 31,
                     -----------------------------------------------------------------------------------------------------------
                         1998       1997      1996        1995        1994      1993        1992      1991      1990     1989 (a)
                     ------------  -------   -------     -------     -------   -------     -------   -------   -------   -------
                                                                                           
 
PER SHARE OPERATING
  PERFORMANCE:
Net asset value,
  beginning of
  year.............      $  12.00  $ 11.71   $ 11.88     $ 11.75     $ 12.51   $ 11.90     $ 11.30   $ 10.81   $ 11.03   $10.57
                     ------------  -------   -------     -------     -------   -------     -------   -------   -------   -------
INCOME FROM
  INVESTMENT
  OPERATIONS
Net investment
  income...........           .55      .56(d)     .57(d)     .59(d)      .59       .62         .63       .63       .65      .68
Net realized and
  unrealized gain
  (loss) on
  investment
  transactions.....           .43      .33      (.02)        .16        (.69)      .71         .60       .49      (.22)     .46
                     ------------  -------   -------     -------     -------   -------     -------   -------   -------   -------
Total from
  investment
  operations.......           .98      .89       .55         .75        (.10)     1.33        1.23      1.12       .43     1.14
                     ------------  -------   -------     -------     -------   -------     -------   -------   -------   -------
LESS DISTRIBUTIONS
Dividends from net
  investment
  income...........          (.55)    (.56)     (.57)       (.59)       (.59)     (.62)       (.63)     (.63)     (.65)    (.68)
Distributions in
  excess of net
  investment
  income...........            --(e)      --(e)      --       --          --        --          --        --        --       --
Distributions from
  net realized
  gains............          (.07)    (.04)     (.15)       (.03)       (.07)     (.10)         --        --        --       --
                     ------------  -------   -------     -------     -------   -------     -------   -------   -------   -------
Total
  distributions....          (.62)    (.60)     (.72)       (.62)       (.66)     (.72)       (.63)     (.63)     (.65)    (.68)
                     ------------  -------   -------     -------     -------   -------     -------   -------   -------   -------
Net asset value,
  end of year......      $  12.36  $ 12.00   $ 11.71     $ 11.88     $ 11.75   $ 12.51     $ 11.90   $ 11.30   $ 10.81   $11.03
                     ------------  -------   -------     -------     -------   -------     -------   -------   -------   -------
                     ------------  -------   -------     -------     -------   -------     -------   -------   -------   -------
TOTAL RETURN
  (b):.............          8.38%    7.76%     4.66%       6.60%      (0.78)%   11.51%      11.18%    10.60%     4.02%   11.08%
RATIOS/SUPPLEMENTAL
  DATA:
Net assets, end of
  year (000).......      $ 23,085  $27,796   $34,971     $41,459     $70,112   $70,302     $56,095   $59,400   $49,923   $47,025
Average net assets
  (000)............      $ 25,412  $31,302   $39,052     $52,216     $72,095   $61,548     $52,137   $50,809   $48,694   $43,957
Ratios to average
  net assets:
  Expenses,
   including
   distribution
   fee.............          1.32%    1.31%(d)    1.31%(d)    1.37%(d)    1.31%    1.36%(c)    1.38%    1.49%     1.44%    1.35%
  Expenses,
   excluding
   distribution
   fee.............           .82%     .81%(d)     .81%(d)     .87%(d)     .81%     .86%(c)     .88%     .99%      .97%     .96%
  Net investment
   income..........          4.50%    4.68%(d)    4.77%(d)    5.04%(d)    4.87%    5.11%(c)    5.42%    5.66%     5.95%    6.20%
Portfolio turnover
  rate.............            29%      20%       36%         33%         12%       14%         30%       62%       55%      36%

    
 
- ---------------
   
   (a)  On December 31, 1988, Prudential Mutual Fund Management, Inc.
        succeeded The Prudential Insurance Company of America as manager of
        the Fund.
    
 
   
   (b)  Total return does not consider the effects of sales loads. Total
        return is calculated assuming a purchase of shares on the first day
        and a sale on the last day of each year reported and includes
        reinvestment of dividends and distributions.
    
 
   
   (c)  Restated.
    
 
   
   (d)  Net of management fee waiver. Effective September 1, 1997, PIFM
        eliminated its management fee waiver (.05 of 1%).
    
 
   
   (e)  Less than $.005 per share.
    
 
                                       6

                              FINANCIAL HIGHLIGHTS
(FOR A SHARE OF BENEFICIAL INTEREST OUTSTANDING THROUGHOUT EACH OF THE INDICATED
                                    PERIODS)
                                (CLASS C SHARES)
 
   
  The following financial highlights, for the two years ended August 31, 1998,
have been audited by PricewaterhouseCoopers LLP, independent accountants, and
for the two years ended August 31, 1996 and for the period from August 1, 1994
through August 31, 1994 have been audited by other independent auditors. All
such audit reports were unqualified. This information should be read in
conjunction with the financial statements and the notes thereto, which appear in
the Statement of Additional Information. The following financial highlights
contain selected data for a Class C share of beneficial interest outstanding,
total return, ratios to average net assets and other supplemental data for the
periods indicated. This information is based on data contained in the financial
statements. Further performance information is contained in the annual report,
which may be obtained without charge. See "Shareholder Guide--Shareholder
Services--Reports to Shareholders."
    
 
   


                                                                      CLASS C
                                             ----------------------------------------------------------
                                                                                             AUGUST 1,
                                                             YEAR ENDED                       1994 (a)
                                                             AUGUST 31,                       THROUGH
                                             ------------------------------------------      AUGUST 31,
                                              1998        1997        1996        1995          1994
                                             ------      ------      ------      ------      ----------
                                                                              
 
PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of period....     $12.00      $11.71      $11.88      $11.75        $11.78
                                             ------      ------      ------      ------      ----------
INCOME FROM INVESTMENT OPERATIONS
Net investment income...................        .52         .53(d)      .54(d)      .56(d)        .04
Net realized and unrealized gain (loss)
  on investment transactions............        .43         .33        (.02)        .16          (.03)
                                             ------      ------      ------      ------      ----------
Total from investment operations........        .95         .86         .52         .72           .01
                                             ------      ------      ------      ------      ----------
LESS DISTRIBUTIONS
Dividends from net investment income....       (.52)       (.53)       (.54)       (.56)         (.04)
Distributions in excess of net
  investment income.....................         --(f)       --(f)       --          --            --
Distributions from net realized gains...       (.07)       (.04)       (.15)       (.03)           --
                                             ------      ------      ------      ------      ----------
Total distributions.....................       (.59)       (.57)       (.69)       (.59)         (.04)
                                             ------      ------      ------      ------      ----------
Net asset value, end of period..........     $12.36      $12.00      $11.71      $11.88        $11.75
                                             ------      ------      ------      ------      ----------
                                             ------      ------      ------      ------      ----------
TOTAL RETURN (c):.......................       8.11%       7.49%       4.39%       6.29%         0.06%
RATIOS/SUPPLEMENTAL DATA:
Net assets, end of period (000).........     $  536      $  315      $  112      $  100        $  200(e)
Average net assets (000)................     $  424      $  161      $   95      $   61        $  199(e)
Ratios to average net assets:
  Expenses, including distribution
   fee..................................       1.57%       1.56%(d)    1.56%(d)    1.68%(d)      2.15%(b)
  Expenses, excluding distribution
   fee..................................        .82%        .81%(d)     .81%(d)     .93%(d)      1.39%(b)
  Net investment income.................       4.25%       4.43%(d)    4.53%(d)    4.66%(d)      4.56%(b)
Portfolio turnover rate.................         29%         20%         36%         33%           12%

    
 
- ---------------
   (a)  Commencement of offering of Class C shares.
 
   (b)  Annualized.
 
   (c)  Total return does not consider the effects of sales loads. Total
        return is calculated assuming a purchase of shares on the first day
        and a sale on the last day of each period reported and includes
        reinvestment of dividends and distributions. Total returns for
        periods of less than a full year are not annualized.
 
   
   (d)  Net of management fee waiver. Effective September 1, 1997, PIFM
        eliminated its management fee waiver (.05 of 1%).
    
 
   (e)  Figures are actual and not rounded to the nearest thousand.
 
   (f)  Less than $.005 per share.
 
                                       7

                              HOW THE FUND INVESTS
 
INVESTMENT OBJECTIVE AND POLICIES
 
  PRUDENTIAL MUNICIPAL SERIES FUND (THE FUND) IS AN OPEN-END, MANAGEMENT
INVESTMENT COMPANY, OR MUTUAL FUND, CONSISTING OF THIRTEEN SEPARATE SERIES. EACH
OF THESE SERIES IS MANAGED INDEPENDENTLY. THE MICHIGAN SERIES (THE SERIES) IS
DIVERSIFIED AND ITS INVESTMENT OBJECTIVE IS TO MAXIMIZE CURRENT INCOME THAT IS
EXEMPT FROM MICHIGAN STATE AND FEDERAL INCOME TAXES CONSISTENT WITH THE
PRESERVATION OF CAPITAL AND, IN CONJUNCTION THEREWITH, THE SERIES MAY INVEST IN
DEBT SECURITIES WITH THE POTENTIAL FOR CAPITAL GAIN. See "Investment Objectives
and Policies" in the Statement of Additional Information.
 
  THE SERIES' INVESTMENT OBJECTIVE IS A FUNDAMENTAL POLICY AND, THEREFORE, MAY
NOT BE CHANGED WITHOUT THE APPROVAL OF THE HOLDERS OF A MAJORITY OF THE SERIES'
OUTSTANDING VOTING SECURITIES AS DEFINED IN THE INVESTMENT COMPANY ACT OF 1940,
AS AMENDED (THE INVESTMENT COMPANY ACT). THE SERIES' POLICIES THAT ARE NOT
FUNDAMENTAL MAY BE MODIFIED BY THE TRUSTEES.
 
  THE SERIES WILL INVEST PRIMARILY IN MICHIGAN STATE, MUNICIPAL AND LOCAL
GOVERNMENT OBLIGATIONS AND OBLIGATIONS OF OTHER QUALIFYING ISSUERS, SUCH AS
ISSUERS LOCATED IN PUERTO RICO, THE VIRGIN ISLANDS AND GUAM, WHICH PAY INCOME
EXEMPT, IN THE OPINION OF COUNSEL, FROM MICHIGAN STATE AND FEDERAL INCOME TAXES
(MICHIGAN OBLIGATIONS). THERE CAN BE NO ASSURANCE THAT THE SERIES WILL BE ABLE
TO ACHIEVE ITS INVESTMENT OBJECTIVE.
 
  As with an investment in any mutual fund, an investment in this Series can
decrease and you can lose money.
 
   
  Interest on certain municipal obligations may be a preference item for
purposes of the federal alternative minimum tax. The Series may invest without
limit in municipal obligations that are private activity bonds (as defined in
the Internal Revenue Code) the interest on which would be a preference item for
purposes of the federal alternative minimum tax. See "Taxes, Dividends and
Distributions." Under Michigan law, dividends paid by the Series are exempt from
Michigan income tax and single business tax for resident individuals and
corporations to the extent they are derived from interest payments on Michigan
Obligations. Michigan Obligations could include general obligation bonds of the
State, counties, cities, towns, etc., revenue bonds of utility systems,
highways, bridges, port and airport facilities, colleges, hospitals, etc., and
industrial development and pollution control bonds. The Series will invest in
long-term obligations, and the dollar-weighted average maturity of the Series'
portfolio will generally range between 10-20 years. The Series also may invest
in certain short-term, tax-exempt notes such as Tax Anticipation Notes, Revenue
Anticipation Notes, Bond Anticipation Notes, Construction Loan Notes and
variable and floating rate demand notes.
    
 
   
  Generally, municipal obligations with longer maturities produce higher yields
and are subject to greater price fluctuations as a result of changes in interest
rates (market risk) than municipal obligations with shorter maturities. The
prices of municipal obligations vary inversely with interest rates. Interest
rates are currently much lower than in recent years. As a general matter, bond
prices and the Series' NAV will vary inversely with interest rate fluctuations.
If rates were to rise sharply, the prices of bonds in the Series' portfolio
might be adversely affected.
    
 
  THE SERIES MAY INVEST ITS ASSETS IN FLOATING RATE AND VARIABLE RATE
SECURITIES, INCLUDING PARTICIPATION INTERESTS THEREIN AND INVERSE FLOATERS.
There is no limit on the amount of such securities that the Series may purchase.
Floating rate securities normally have a rate of interest which is set as a
specific percentage of a designated base rate, such as the rate on Treasury
bonds or bills or the prime rate at a major commercial bank. The interest rate
on floating rate securities changes periodically when there is a change in the
designated base interest rate. Variable rate securities provide for a specified
periodic adjustment in the interest rate based on prevailing market rates and
generally would allow the Series to demand payment of the obligation on short
notice at par plus accrued interest, which amount may be more or less than the
amount the Series paid for them. An inverse floater is a debt instrument with a
floating or variable interest rate that moves in the opposite direction of the
 
                                       8

interest rate on another security or the value of an index. Changes in the
interest rate on the other security or index inversely affect the residual
interest rate paid on the inverse floater, with the result that the inverse
floater's price will be considerably more volatile than that of a fixed rate
bond. The market for the inverse floaters is relatively new.
 
  THE SERIES MAY ALSO INVEST IN MUNICIPAL LEASE OBLIGATIONS. A MUNICIPAL LEASE
OBLIGATION IS A MUNICIPAL SECURITY THE INTEREST ON AND PRINCIPAL OF WHICH IS
PAYABLE OUT OF LEASE PAYMENTS MADE BY THE PARTY LEASING THE FACILITIES FINANCED
BY THE ISSUE. Typically, municipal lease obligations are issued by a state or
municipal financing authority to provide funds for the construction of
facilities (E.G., schools, dormitories, office buildings or prisons) or the
acquisition of equipment. The facilities are typically used by the state or
municipality pursuant to a lease with a financing authority. Certain municipal
lease obligations may trade infrequently. Accordingly, the investment adviser
will monitor the liquidity of municipal lease obligations under the supervision
of the Trustees. Municipal lease obligations will not be considered illiquid for
purposes of the Series' 15% limitation on illiquid securities provided the
investment adviser determines that there is a readily available market for such
securities. See "Other Investments and Policies--Illiquid Securities" below.
 
   
  THE SERIES WILL INVEST AT LEAST 70% OF ITS TOTAL ASSETS IN MICHIGAN
OBLIGATIONS WHICH, AT THE TIME OF PURCHASE, ARE RATED WITHIN THE FOUR HIGHEST
QUALITY GRADES AS DETERMINED BY MOODY'S INVESTORS SERVICE (MOODY'S) (CURRENTLY
Aaa, Aa, A, Baa FOR BONDS, MIG 1, MIG 2, MIG 3, MIG 4 FOR NOTES AND PRIME-1 FOR
COMMERCIAL PAPER), STANDARD & POOR'S RATINGS GROUP (S&P) (CURRENTLY AAA, AA, A,
BBB FOR BONDS, SP-1, SP-2 FOR NOTES AND A-1 FOR COMMERCIAL PAPER) OR ANOTHER
NATIONALLY RECOGNIZED STATISTICAL RATING ORGANIZATION (NRSRO) OR, IF UNRATED,
WILL POSSESS CREDITWORTHINESS, IN THE OPINION OF THE INVESTMENT ADVISER,
COMPARABLE TO SUCH INVESTMENT GRADE RATED SECURITIES.
    
 
   
  THE SERIES MAY ALSO INVEST UP TO 30% OF ITS TOTAL ASSETS IN MICHIGAN
OBLIGATIONS RATED BELOW Baa BY MOODY'S OR BELOW BBB BY S&P, OR A COMPARABLE
RATING OF ANOTHER NRSRO OR, IF NON-RATED, OF COMPARABLE QUALITY, IN THE OPINION
OF THE FUND'S INVESTMENT ADVISER, BASED ON ITS CREDIT ANALYSIS. Securities rated
Baa by Moody's and BBB by S&P are described as being investment grade but are
also characterized as having speculative characteristics. Securities rated below
Baa by Moody's and below BBB by S&P are considered speculative. See "Description
of Security Ratings" in the Appendix. Such lower-rated high yield securities are
commonly referred to as junk bonds. Such securities generally offer a higher
current yield than those in the higher rating categories but may also involve
greater price volatility and risk of loss of principal and income. The
investment adviser will attempt to manage risk and enhance yield through credit
analysis and careful security selection. See "Risk Factors Relating to Investing
in High Yield Municipal Obligations" below. Subsequent to its purchase by the
Series, a municipal obligation may be assigned a lower rating or cease to be
rated. Such an event would not require the elimination of the issue from the
portfolio, but the investment adviser will consider such an event in determining
whether the Series should continue to hold the security in its portfolio. Many
issuers of lower-quality bonds choose not to have their obligations rated and
the Series may invest in such unrated securities. Investors should carefully
consider the relative risks associated with investments in securities which
carry lower ratings and in comparable non-rated securities.
    
 
   
  During the year ended August 31, 1998, the monthly dollar weighted average
ratings of the debt obligations held by the Series, expressed as a percentage of
the Series' total assets, were as follows:
    
   


                                                   PERCENTAGE OF
          RATINGS                                TOTAL INVESTMENTS
          ------------------------------     -------------------------
                                          
          AAA/Aaa.......................                      63.73   %
          AA/Aa.........................                       4.43   %
          A/A...........................                       8.18   %
          BBB/Baa.......................                      18.15   %
 

 
          UNRATED
          ------------------------------
                                          
            BBB/Baa.....................                       0.96   %
            BB/Ba.......................                       3.56   %
            B/B.........................                       0.99   %

    
 
                                       9

  From time to time, the Series may own the majority of a municipal issue. Such
majority-owned holdings may present market and credit risks.
 
  The Series may purchase Michigan Obligations which, in the opinion of the
investment adviser, offer the opportunity for capital appreciation. This may
occur, for example, when the investment adviser believes that the issuer of a
particular Michigan Obligation might receive an upgraded credit standing,
thereby increasing the market value of the bonds it has issued or when the
investment adviser believes that interest rates might decline.
 
  UNDER NORMAL MARKET CONDITIONS, THE SERIES WILL ATTEMPT TO INVEST
SUBSTANTIALLY ALL OF THE VALUE OF ITS ASSETS IN MICHIGAN OBLIGATIONS. As a
matter of fundamental policy, during normal market conditions the Series' assets
will be invested so that at least 80% of the income will be exempt from Michigan
State and federal income taxes or the Series will have at least 80% of its total
assets invested in Michigan Obligations. During abnormal market conditions or to
provide liquidity, the Series may hold cash or cash equivalents or investment
grade taxable obligations, including obligations that are exempt from federal,
but not state, taxation and the Series may invest in tax-free cash equivalents,
such as floating rate demand notes, tax-exempt commercial paper and general
obligation and revenue notes or in taxable cash equivalents, such as
certificates of deposit, bankers acceptances, time deposits or other short-term
taxable investments such as repurchase agreements. When, in the opinion of the
investment adviser, abnormal market conditions require a temporary defensive
position, the Series may invest more than 20% of the value of its assets in debt
securities other than Michigan Obligations or may invest its assets so that more
than 20% of the income is subject to Michigan State or federal income taxes. The
Series will treat an investment in a municipal bond refunded with escrowed U.S.
Government securities as U.S. Government securities for purposes of the
Investment Company Act's diversification requirements provided certain
conditions are met. See "Investment Objectives and Policies--In General" in the
Statement of Additional Information.
 
   
  THE SERIES MAY ACQUIRE PUT OPTIONS (PUTS) GIVING THE SERIES THE RIGHT TO SELL
SECURITIES HELD IN THE SERIES' PORTFOLIO AT A SPECIFIED EXERCISE PRICE ON A
SPECIFIED DATE. Such puts may be acquired for the purpose of protecting the
Series from a possible decline in the market value of the security to which the
put applies in the event of interest rate fluctuations or, in the case of
liquidity puts, for the purpose of shortening the effective maturity of the
underlying security. The aggregate value of premiums paid to acquire puts held
in the Series' portfolio (other than liquidity puts) may not exceed 10% of the
NAV of the Series. The acquisition of a put may involve an additional cost to
the Series by payment of a premium for the put, by payment of a higher purchase
price for securities to which the put is attached or through a lower effective
interest rate.
    
 
  In addition, there is a credit risk associated with the purchase of puts in
that the issuer of the put may be unable to meet its obligation to purchase the
underlying security. Accordingly, the Series will acquire puts only under the
following circumstances: (1) the put is written by the issuer of the underlying
security and such security is rated within the four highest quality grades as
determined by an NRSRO; or (2) the put is written by a person other than the
issuer of the underlying security and such person has securities outstanding
which are rated within such four highest quality grades; or (3) the put is
backed by a letter of credit or similar financial guarantee issued by a person
having securities outstanding which are rated within the two highest quality
grades of an NRSRO.
 
   
  THE SERIES MAY PURCHASE MUNICIPAL OBLIGATIONS ON A WHEN-ISSUED OR DELAYED
DELIVERY BASIS, IN EACH CASE WITHOUT LIMIT. When municipal obligations are
offered on a when-issued or delayed delivery basis, the price and coupon rate
are fixed at the time the commitment to purchase is made, but delivery and
payment for the securities take place at a later date. During the period between
purchase and settlement, no interest accrues to the economic benefit of the
purchaser. In the case of purchases by the Series, the price that the Series is
required to pay on the settlement date may be in excess of the market value of
the municipal obligations on that date. While securities may be sold prior to
the settlement date, the Series intends to purchase these securities with the
purpose of actually acquiring them unless a sale would be desirable for
investment reasons. At the time the Series makes the commitment to purchase a
municipal obligation on a when-issued or delayed delivery basis, it will record
the transaction and reflect the value of the obligation each day in determining
its NAV. This value may fluctuate from day to day in the same manner as
    
 
                                       10

   
values of municipal obligations otherwise held by the Series. If the seller
defaults in the sale, the Series could fail to realize the appreciation, if any,
that had occurred. The Series will establish a segregated account in which it
will maintain cash or other liquid assets, equal or greater in value to its
commitments for when-issued or delayed delivery securities.
    
 
  THE SERIES MAY ALSO PURCHASE MUNICIPAL FORWARD CONTRACTS. A municipal forward
contract is a municipal security which is purchased on a when-issued basis with
delivery taking place up to five years from the date of purchase. No interest
will accrue on the security prior to the delivery date. The investment adviser
will monitor the liquidity, value, credit quality and delivery of the security
under the supervision of the Trustees.
 
  THE SERIES MAY PURCHASE SECONDARY MARKET INSURANCE ON MICHIGAN OBLIGATIONS
WHICH IT HOLDS OR ACQUIRES. Secondary market insurance would be reflected in the
market value of the municipal obligation purchased and may enable the Series to
dispose of a defaulted obligation at a price similar to that of comparable
municipal obligations which are not in default.
 
   
  Insurance is not a substitute for the basic credit of an issuer, but
supplements the existing credit and provides additional security therefor. While
insurance coverage for the Michigan Obligations held by the Series reduces
credit risk by providing that the insurance company will make timely payment of
principal and interest if the issuer defaults on its obligation to make such
payment, it does not afford protection against fluctuation in the price, I.E.,
the market value, of the municipal obligations caused by changes in interest
rates and other factors, nor in turn against fluctuations in the NAV of the
shares of the Series.
    
 
   
  RISK FACTORS RELATING TO INVESTING IN HIGH YIELD MUNICIPAL OBLIGATIONS.
FIXED-INCOME SECURITIES ARE SUBJECT TO THE RISK OF AN ISSUER'S INABILITY TO MEET
PRINCIPAL AND INTEREST PAYMENTS ON THE OBLIGATIONS (CREDIT RISK) AND MAY ALSO BE
SUBJECT TO PRICE VOLATILITY DUE TO SUCH FACTORS AS INTEREST RATE SENSITIVITY,
MARKET PERCEPTION OF THE CREDITWORTHINESS OF THE ISSUER AND GENERAL MARKET
LIQUIDITY (MARKET RISK). Lower-rated or unrated (I.E., high yield) securities,
commonly known as junk bonds, are more likely to react to developments affecting
market and credit risk than are more highly rated securities, which react
primarily to movements in the general level of interest rates. The investment
adviser will perform its own investment analysis and will not rely principally
on the ratings assigned by the rating services, although such ratings will be
considered by the investment adviser. The investment adviser will consider,
among other things, credit risk and market risk, as well as the financial
history and condition, the prospects and the management of an issuer in
selecting securities for the Series' portfolio. The achievement of the Series'
investment objective may be more dependent on the investment adviser's credit
analysis than is the case when investing in only higher quality bonds. Investors
should carefully consider the relative risks of investing in high yield
municipal obligations and understand that such securities are not generally
meant for short-term investing and that yields on junk bonds will fluctuate over
time.
    
 
   
  The amount of high yield securities outstanding has proliferated recently in
conjunction with the decline in creditworthiness of many obligors on municipal
debt, particularly health care providers and certain governmental bodies. An
economic downturn could severely affect the ability of highly leveraged issuers
to service their debt obligations or to repay their obligations upon maturity.
Furthermore, changes in economic conditions and other circumstances are more
likely to lead to a weakened capacity to make principal and interest payments
than in the case of higher grade bonds. In addition, the secondary market for
high yield securities, which is concentrated in relatively few market makers,
may not be as liquid as the secondary market for more highly rated securities
and, from time to time, it may be more difficult to value high yield securities
than more highly rated securities, and the judgment of the Board of Trustees and
the investment adviser may play a greater role in valuation because there is
less reliable objective data available. Under adverse market or economic
conditions, the secondary market for high yield securities could contract
further, independent of any specific adverse changes in the condition of a
particular issuer. As a result, the investment adviser could find it more
difficult to sell these securities or may be able to sell the securities only at
prices lower than if such securities were widely traded. Prices realized upon
the sale of such lower rated or unrated securities, under these circumstances,
may be less than the prices used in calculating the Series' NAV. If the
investment adviser becomes involved in activities such as reorganizations of
obligors of troubled investments held by the Series, this may prevent the Series
from disposing of the securities, due to its possession of material, non-public
information concerning the obligor.
    
 
                                       11

   
  LOWER-RATED OR UNRATED DEBT OBLIGATIONS ALSO PRESENT RISKS BASED ON PAYMENT
EXPECTATIONS. If an issuer calls the obligation for redemption, the Series may
have to replace the security with a lower-yielding security, resulting in a
decreased return for investors. If the Series experiences unexpected net
redemptions, it may be forced to sell its higher rated securities, resulting in
a decline in the overall credit quality of the portfolio and increasing the
exposure of the Series to the risks of high yield securities.
    
 
  FUTURES CONTRACTS AND OPTIONS THEREON
 
   
  THE SERIES IS AUTHORIZED TO PURCHASE AND SELL CERTAIN DERIVATIVES, INCLUDING
FINANCIAL FUTURES CONTRACTS (FUTURES CONTRACTS) AND OPTIONS THEREON FOR THE
PURPOSE OF HEDGING ITS PORTFOLIO SECURITIES AGAINST FLUCTUATIONS IN VALUE CAUSED
BY CHANGES IN PREVAILING MARKET INTEREST RATES AND HEDGING AGAINST INCREASES IN
THE COST OF SECURITIES THE SERIES INTENDS TO PURCHASE. THE SUCCESSFUL USE OF
FUTURES CONTRACTS AND OPTIONS THEREON BY THE SERIES INVOLVES ADDITIONAL
TRANSACTION COSTS, IS SUBJECT TO VARIOUS RISKS AND DEPENDS UPON THE INVESTMENT
ADVISER'S ABILITY TO PREDICT THE DIRECTION OF THE MARKET (INCLUDING INTEREST
RATES). THE SERIES, AND THUS INVESTORS, MAY LOSE MONEY THROUGH ANY UNSUCCESSFUL
USE OF THESE STRATEGIES.
    
 
  A FUTURES CONTRACT OBLIGATES THE SELLER OF THE CONTRACT TO DELIVER TO THE
PURCHASER OF THE CONTRACT CASH EQUAL TO A SPECIFIC DOLLAR AMOUNT TIMES THE
DIFFERENCE BETWEEN THE VALUE OF A SPECIFIC FIXED-INCOME SECURITY OR INDEX AT THE
CLOSE OF THE LAST TRADING DAY OF THE CONTRACT AND THE PRICE AT WHICH THE
AGREEMENT IS MADE. No physical delivery of the underlying securities is made.
The Series will engage in transactions in only those futures contracts and
options thereon that are traded on a commodities exchange or a board of trade.
 
   
  THE SERIES INTENDS TO ENGAGE IN FUTURES CONTRACTS AND OPTIONS THEREON AS A
HEDGE AGAINST CHANGES, RESULTING FROM MARKET CONDITIONS, IN THE VALUE OF
SECURITIES WHICH ARE HELD IN THE SERIES' PORTFOLIO OR WHICH THE SERIES INTENDS
TO PURCHASE, IN ACCORDANCE WITH THE RULES AND REGULATIONS OF THE COMMODITY
FUTURES TRADING COMMISSION (CFTC). The Series also intends to engage in such
transactions when they are economically appropriate for the reduction of risks
inherent in the ongoing management of the Series.
    
 
   
  THE SERIES MAY NOT PURCHASE OR SELL FUTURES CONTRACTS OR OPTIONS THEREON IF,
IMMEDIATELY THEREAFTER, (I) THE SUM OF INITIAL AND NET CUMULATIVE VARIATION
MARGIN ON OUTSTANDING FUTURES CONTRACTS, TOGETHER WITH PREMIUMS PAID FOR OPTIONS
THEREON, WOULD EXCEED 20% OF THE TOTAL ASSETS OF THE SERIES, OR (II) IN THE CASE
OF RISK MANAGEMENT TRANSACTIONS, THE SUM OF THE AMOUNT OF INITIAL MARGIN
DEPOSITS ON THE SERIES' FUTURES POSITIONS AND PREMIUMS PAID FOR OPTIONS THEREON
WOULD EXCEED 5% OF THE LIQUIDATION VALUE OF THE SERIES' TOTAL ASSETS. There are
no limitations on the percentage of the portfolio which may be hedged and no
limitations on the use of the Series' assets to cover futures contracts and
options thereon, except that the aggregate value of the obligations underlying
put options will not exceed 50% of the Series' assets.
    
 
  Currently, futures contracts are available on several types of fixed-income
securities, including U.S. Treasury bonds and notes, three-month U.S. Treasury
bills and Eurodollars. Futures contracts are also available on a municipal bond
index, based on THE BOND BUYER Municipal Bond Index, an index of 40 actively
traded municipal bonds. The Series may also engage in transactions in other
futures contracts that become available, from time to time, in other
fixed-income securities or municipal bond indices and in other options on such
contracts if the investment adviser believes such contracts and options would be
appropriate for hedging the Series' portfolio.
 
  THERE CAN BE NO ASSURANCE THAT VIABLE MARKETS WILL CONTINUE OR THAT A LIQUID
SECONDARY MARKET WILL EXIST TO TERMINATE ANY PARTICULAR FUTURES CONTRACT AT ANY
SPECIFIC TIME. If it is not possible to close a futures position entered into by
the Series, the Series will continue to be required to make daily cash payments
of variation margin in the event of adverse price movements. In such a
situation, if the Series had insufficient cash, it might have to sell portfolio
securities to meet daily variation margin requirements at a time when it might
be disadvantageous to do so. The inability to close futures positions also could
have an adverse impact on the ability of the Series to hedge effectively. There
is also a risk of loss by the Series of margin deposits in the event of
bankruptcy of a broker with whom the Series has an open position in a futures
contract.
 
                                       12

  THE SUCCESSFUL USE OF FUTURES CONTRACTS AND OPTIONS THEREON BY THE SERIES IS
SUBJECT TO VARIOUS ADDITIONAL RISKS. Any use of futures transactions involves
the risk of imperfect correlation in movements in the price of futures contracts
and movements in interest rates and, in turn, the prices of the securities that
are the subject of the hedge. If the price of the futures contract moves more or
less than the price of the security that is the subject of the hedge, the Series
will experience a gain or loss that will not be completely offset by movements
in the price of the security. The risk of imperfect correlation is greater where
the securities underlying futures contracts are taxable securities (rather than
municipal securities), are issued by companies in different market sectors or
have different maturities, ratings or geographic mixes than the security being
hedged. In addition, the correlation may be affected by additions to or
deletions from the index which serves as the basis for a futures contract.
Finally, if the price of the security that is subject to the hedge were to move
in a favorable direction, the advantage to the Series would be partially offset
by the loss incurred on the futures contract.
 
  SPECIAL CONSIDERATIONS
 
   
  BECAUSE THE SERIES WILL INVEST AT LEAST 80% OF THE VALUE OF ITS TOTAL ASSETS
IN MICHIGAN OBLIGATIONS AND BECAUSE IT SEEKS TO MAXIMIZE INCOME DERIVED FROM
MICHIGAN OBLIGATIONS, IT IS MORE SUSCEPTIBLE TO FACTORS ADVERSELY AFFECTING
ISSUERS OF MICHIGAN OBLIGATIONS THAN IS A COMPARABLE MUNICIPAL BOND MUTUAL FUND
THAT IS NOT CONCENTRATED IN SUCH OBLIGATIONS TO THIS DEGREE. Michigan is a
highly industrialized state with an economy principally dependent upon three
sectors: manufacturing (particularly durable goods, automotive products and
office equipment), tourism and agriculture. Michigan's recovery from the effects
of a downturn in the automotive industry in the late 1980's has proved to be
robust. At the end of calendar 1997, the employment levels had reached an
all-time high, and total wage and salary employment is projected to grow 1.7% in
1998 and 0.8% in 1999. This growth reflects the ongoing diversification of the
Michigan economy. At the end of calendar 1997, the unemployment rate in Michigan
had fallen to 4.2%, and it is projected to average 4.1% in 1998 and 4.4% in
1999, continuing the recent trend of being below the national average.
Michigan's economy is among the most cyclical of all the states and remains
dependent on domestic vehicle production and durable goods consumption. For
fiscal 1995, 1996 and 1997, the State achieved budget surpluses of $82 million,
$197 million and $13 million, respectively. Fiscal 1998 General Fund revenues
and expenditures are expected to be $8,590 million and $8,602 million,
respectively. Current projections are that the unreserved balance of the State's
Budget Stabilization Fund was $646 million at the end of fiscal year 1997.
    
 
  The market value and the marketability of Michigan Obligations may be affected
adversely by the same factors that affect Michigan's economy generally. If
either Michigan or any of its local governmental entities is unable to meet its
financial obligations, the income derived by the Series, the ability to preserve
or realize appreciation of the Series' capital and the Series' liquidity could
be adversely affected. See "Investment Objectives and Policies--Special
Considerations Regarding Investments in Tax-Exempt Securities" in the Statement
of Additional Information.
 
OTHER INVESTMENTS AND POLICIES
 
  REPURCHASE AGREEMENTS
 
   
  The Series may on occasion enter into repurchase agreements whereby the seller
of a security agrees to repurchase that security from the Series at a mutually
agreed-upon time and price. The period of maturity is usually quite short,
possibly overnight or a few days, although it may extend over a number of
months. The resale price is in excess of the purchase price, reflecting an
agreed-upon rate of return effective for the period of time the Series' money is
invested in the repurchase agreement. The Series' repurchase agreements will at
all times be fully collateralized in an amount at least equal to the resale
price. The instruments held as collateral are valued daily and if the value of
the instruments declines, the Series will require additional collateral. If the
seller defaults and the value of the collateral securing the repurchase
agreement declines, the Series may incur a loss. The Series participates in a
joint repurchase account with other investment companies managed by PIFM
pursuant to an order of the Commission.
    
 
                                       13

  BORROWING
 
  The Series may borrow an amount equal to no more than 33 1/3% of the value of
its total assets (calculated when the loan is made) for temporary, extraordinary
or emergency purposes or for the clearance of transactions. The Series may
pledge up to 33 1/3% of the value of its total assets to secure these
borrowings. The Series will not purchase portfolio securities if its borrowings
exceed 5% of its total assets.
 
  PORTFOLIO TURNOVER
 
   
  The Series does not expect to trade in securities for short-term gain. It is
anticipated that the annual portfolio turnover rate will not exceed 150%. The
portfolio turnover rate is calculated by dividing the lesser of sales or
purchases of portfolio securities by the average monthly value of the portfolio
securities, excluding securities having a maturity at the date of purchase of
one year or less. High portfolio turnover of a Series may involve
correspondingly greater brokerage commissions and other transaction costs, which
will be borne directly by that Series. In addition, high portfolio turnover may
result in increased short-term capital gains, which, when distributed to
shareholders, are treated as ordinary income. See "Taxes, Dividends and
Distributions."
    
 
  ILLIQUID SECURITIES
 
   
  The Series may hold up to 15% of its net assets in illiquid securities
including repurchase agreements which have a maturity of longer than seven days,
securities with legal or contractual restrictions on resale (restricted
securities) and securities that are not readily marketable. Securities,
including restricted securities eligible for resale pursuant to Rule 144A under
the Securities Act of 1933, as amended (the Securities Act), privately placed
commercial paper and municipal lease obligations, that have a readily available
market are not considered illiquid for the purposes of this limitation. The
investment adviser will monitor the liquidity of such restricted securities
under the supervision of the Trustees. The Series' investment in Rule 144A
securities could have the effect of increasing illiquidity to the extent that
qualified institutional buyers become, for a limited time, uninterested in
purchasing Rule 144A securities. See "Investment Objectives and
Policies--Illiquid Securities" and "Investment Restrictions" in the Statement of
Additional Information. Repurchase agreements subject to demand are deemed to
have a maturity equal to the notice period.
    
 
INVESTMENT RESTRICTIONS
 
  The Series is subject to certain investment restrictions which, like its
investment objective, constitute fundamental policies. Fundamental policies
cannot be changed without the approval of the holders of a majority of the
Series' outstanding voting securities, as defined in the Investment Company Act.
See "Investment Restrictions" in the Statement of Additional Information.
 
                            HOW THE FUND IS MANAGED
 
  THE FUND HAS TRUSTEES WHO, IN ADDITION TO OVERSEEING THE ACTIONS OF THE FUND'S
MANAGER, SUBADVISER AND DISTRIBUTOR, AS SET FORTH BELOW, DECIDE UPON MATTERS OF
GENERAL POLICY. THE FUND'S MANAGER CONDUCTS AND SUPERVISES THE DAILY BUSINESS
OPERATIONS OF THE FUND. THE FUND'S SUBADVISER FURNISHES DAILY INVESTMENT
ADVISORY SERVICES.
 
   
  For the fiscal year ended August 31, 1998, total expenses of the Series as a
percentage of average net assets were .92%, 1.32% and 1.57% for the Series'
Class A, Class B and Class C shares, respectively. See "Financial Highlights."
    
 
MANAGER
 
  PRUDENTIAL INVESTMENTS FUND MANAGEMENT LLC (PIFM OR THE MANAGER), GATEWAY
CENTER THREE, 100 MULBERRY STREET, NEWARK, NEW JERSEY 07102-4077, IS THE MANAGER
OF THE FUND AND IS COMPENSATED FOR ITS SERVICES AT AN
 
                                       14

   
ANNUAL RATE OF .50 OF 1% OF THE AVERAGE DAILY NET ASSETS OF THE SERIES. PIFM is
organized in New York as a limited liability company. For the fiscal year ended
August 31, 1998, the Series paid PIFM a management fee of .50 of 1% of the
Series' average net assets. See "Fee Waivers and Subsidy" below and "Manager" in
the Statement of Additional Information.
    
 
   
  As of September 30, 1998, PIFM served as the manager to 44 open-end investment
companies, constituting all of the Prudential Mutual Funds, and as manager or
administrator to 22 closed-end investment companies with aggregate assets of
approximately $67 billion.
    
 
  UNDER THE MANAGEMENT AGREEMENT WITH THE FUND, PIFM MANAGES THE INVESTMENT
OPERATIONS OF EACH SERIES OF THE FUND AND ALSO ADMINISTERS THE FUND'S BUSINESS
AFFAIRS. See "Manager" in the Statement of Additional Information.
 
   
  UNDER A SUBADVISORY AGREEMENT BETWEEN PIFM AND THE PRUDENTIAL INVESTMENT
CORPORATION (PIC, THE SUBADVISER OR THE INVESTMENT ADVISER), THE SUBADVISER
FURNISHES INVESTMENT ADVISORY SERVICES IN CONNECTION WITH THE MANAGEMENT OF THE
FUND AND IS REIMBURSED BY PIFM FOR ITS REASONABLE COSTS AND EXPENSES INCURRED IN
PROVIDING SUCH SERVICES. PIC's address is Prudential Plaza, Newark, New Jersey
07102-3777. Under the Management Agreement, PIFM continues to have
responsibility for all investment advisory services and supervises the
Subadviser's performance of such services.
    
 
  The current portfolio manager of the Series is James M. Murphy, Mr. Murphy has
responsibility for the day-to-day management of the portfolio. He has managed
the portfolio since January 1997 and has been employed by PIC in various
capacities since 1989.
 
  PIFM and PIC are indirect, wholly-owned subsidiaries of The Prudential
Insurance Company of America (Prudential), a major diversified insurance and
financial services company, and are part of Prudential Investments, a business
group of Prudential.
 
   
FEE WAIVERS AND SUBSIDY
    
 
   
  PIFM may from time to time agree to waive all or a portion of its management
fee and subsidize all or a portion of the operating expenses of the Series. Fee
waivers and expense subsidies will increase the Series' yield and total return.
The Series is not required to reimburse PIFM for such management fee waiver. See
"Performance Information" in the Statement of Additional Information and "Fund
Expenses."
    
 
DISTRIBUTOR
 
   
  PRUDENTIAL INVESTMENT MANAGEMENT SERVICES LLC (THE DISTRIBUTOR), GATEWAY
CENTER THREE, 100 MULBERRY STREET, NEWARK, NEW JERSEY 07102-4077, IS A LIMITED
LIABILITY COMPANY ORGANIZED UNDER THE LAWS OF THE STATE OF DELAWARE AND SERVES
AS THE DISTRIBUTOR OF THE SHARES OF THE SERIES. IT IS A WHOLLY-OWNED SUBSIDIARY
OF PRUDENTIAL. Prudential Securities Incorporated (Prudential Securities), One
Seaport Plaza, New York, New York 10292, previously served as distributor of the
Series' shares. It is an indirect, wholly-owned subsidiary of Prudential.
    
 
   
  UNDER SEPARATE DISTRIBUTION AND SERVICE PLANS (THE CLASS A PLAN, THE CLASS B
PLAN AND THE CLASS C PLAN, COLLECTIVELY, THE PLANS) ADOPTED BY THE FUND UNDER
RULE 12b-1 UNDER THE INVESTMENT COMPANY ACT AND A DISTRIBUTION AGREEMENT (THE
DISTRIBUTION AGREEMENT), THE DISTRIBUTOR INCURS THE EXPENSES OF DISTRIBUTING THE
CLASS A, CLASS B AND CLASS C SHARES OF THE SERIES. These expenses include
commissions and account servicing fees paid to, or on account of Dealers or
financial institutions which have entered into agreements with the Distributor,
advertising expenses, the cost of printing and mailing prospectuses to potential
investors and indirect and overhead costs of the Distributor associated with the
sale of Series shares, including lease, utility, communications and sales
promotion expenses. Certain Dealers are paid higher fees than others with
respect to Class A shares pursuant to separate agreements with the Distributor.
    
 
                                       15

  Under the Plans, the Series is obligated to pay distribution and/or service
fees to the Distributor as compensation for its distribution and service
activities, not as reimbursement for specific expenses incurred. If the
Distributor's expenses exceed its distribution and service fees, the Series will
not be obligated to pay any additional expenses. If the Distributor's expenses
are less than such distribution and service fees, it will retain its full fees
and realize a profit.
 
   
  The distribution and/or service fees may also be used by the Distributor to
compensate on a continuing basis Dealers in consideration for the distribution,
marketing, administrative and other services and activities provided by Dealers
with respect to the promotion of the sale of the Series' shares and the
maintenance of related shareholder accounts.
    
 
   
  UNDER THE CLASS A PLAN, THE SERIES MAY PAY THE DISTRIBUTOR FOR ITS
DISTRIBUTION-RELATED ACTIVITIES WITH RESPECT TO CLASS A SHARES AT AN ANNUAL RATE
OF UP TO .30 OF 1% OF THE AVERAGE DAILY NET ASSETS OF THE CLASS A SHARES OF THE
SERIES. The Class A Plan provides that (i) up to .25 of 1% of the average daily
net assets of the Class A shares may be used to pay for personal service and/or
the maintenance of shareholder accounts (service fee) and (ii) total
distribution fees (including the service fee of .25 of 1%) may not exceed .30 of
1% of the average daily net assets of the Class A shares. The Distributor has
voluntarily limited its distribution-related fees payable under the Class A Plan
to .10 of 1% of the average daily net assets of the Class A shares. This
voluntary limitation may be modified or terminated at any time without notice.
    
 
   
  UNDER THE CLASS B AND CLASS C PLANS, THE SERIES MAY PAY THE DISTRIBUTOR FOR
ITS DISTRIBUTION-RELATED ACTIVITIES WITH RESPECT TO CLASS B AND CLASS C SHARES
AT AN ANNUAL RATE OF UP TO .50 OF 1% AND UP TO 1% OF THE AVERAGE DAILY NET
ASSETS OF THE CLASS B AND CLASS C SHARES, RESPECTIVELY. The Class B Plan
provides for the payment to the Distributor of (i) an asset-based sales charge
of up to .50 of 1% of the average daily net assets of the Class B shares, and
(ii) a service fee of up to .25 of 1% of the average daily net assets of the
Class B shares; provided that the total distribution-related fee does not exceed
 .50 of 1%. The Class C Plan provides for the payment to the Distributor of (i)
an asset-based sales charge of up to .75 of 1% of the average daily net assets
of the Class C shares, and (ii) a service fee of up to .25 of 1% of the average
daily net assets of the Class C shares. The service fee is used to pay for
personal service and/or the maintenance of shareholder accounts. The Distributor
has voluntarily limited its distribution-related fees payable under the Class B
and Class C Plans to .10 of 1% and .25 of 1% of the average daily net assets of
the Class B and Class C shares, respectively. These voluntary limitations may be
modified or terminated at any time without notice. The Distributor also receives
CDSC's from certain redeeming shareholders. See "Shareholder Guide--How to Sell
Your Shares--Contingent Deferred Sales Charges."
    
 
   
  For the fiscal year ended August 31, 1998, the Series paid distribution
expenses of .10 of 1%, .50 of 1% and .74 of 1% of the average daily net assets
of the Class A, Class B and Class C shares, respectively. The Series records all
payments made under the Plans as expenses in the calculation of net investment
income. See "Distributor" in the Statement of Additional Information.
    
 
   
  Distribution expenses attributable to the sale of Class A, Class B and Class C
shares of the Series will be allocated to each such class based upon the ratio
of sales of each such class to the sales of Class A, Class B or Class C shares
of the Series other than expenses allocable to a particular class. The
distribution fee and sales charge of one class will not be used to subsidize the
sale of another class.
    
 
   
  Each Plan provides that it shall continue in effect from year to year provided
that a majority of the Trustees of the Fund, including a majority of the
Trustees who are not interested persons of the Fund (as defined in the
Investment Company Act) and who have no direct or indirect financial interest in
the operation of the Plan or any agreement related to the Plan (the Rule 12b-1
Trustees), vote annually to continue the Plan. Each Plan may be terminated with
respect to the Series at any time by vote of a majority of the Rule 12b-1
Trustees or of a majority of the outstanding shares of the applicable class of
the Series. The Series will not be obligated to pay distribution and service
fees incurred under any Plan if it is terminated or not continued.
    
 
   
  In addition to distribution and service fees paid by the Series under the
Class A, Class B and Class C Plans, the Manager (or one of its affiliates) may
make payments out of its own resources to Dealers and other persons which
distribute shares of the Series. Such payments may be calculated by reference to
the NAV of shares sold by such persons or otherwise.
    
 
                                       16

   
  The Distributor is subject to the rules of the National Association of
Securities Dealers, Inc. (the NASD) governing maximum sales charges. See
"Distributor" in the Statement of Additional Information.
    
 
PORTFOLIO TRANSACTIONS
 
   
  Affiliates of the Distributor may act as brokers or futures commission
merchants for the Fund, provided that the commissions, fees or other
remuneration they receive are fair and reasonable. See "Portfolio Transactions
and Brokerage" in the Statement of Additional Information.
    
 
CUSTODIAN AND TRANSFER AND DIVIDEND DISBURSING AGENT
 
  State Street Bank and Trust Company, One Heritage Drive, North Quincy,
Massachusetts 02171, serves as Custodian for the portfolio securities of the
Series and cash and, in that capacity, maintains certain financial and
accounting books and records pursuant to an agreement with the Fund. Its mailing
address is P. O. Box 1713, Boston, Massachusetts 02105.
 
   
  Prudential Mutual Fund Services LLC (PMFS or the Transfer Agent), Raritan
Plaza One, Edison, New Jersey 08837, serves as Transfer Agent and Dividend
Disbursing Agent and, in those capacities, maintains certain books and records
for the Fund. PMFS is a wholly-owned subsidiary of PIFM. Its mailing address is
P. O. Box 15005, New Brunswick, New Jersey 08906-5005.
    
 
   
YEAR 2000
    
 
   
  The services provided to the Fund and the shareholders by the Manager, the
Distributor, the Transfer Agent and the Custodian depend on the smooth
functioning of their computer systems and those of outside service providers.
Many computer software systems in use today cannot distinguish the year 2000
from the year 1900 because of the way dates are encoded and calculated. Such
event could have a negative impact on handling securities trades, payments of
interest and dividends, pricing and account services. Although, at this time,
there can be no assurance that there will be no adverse impact on the Fund, the
Manager, the Distributor, the Transfer Agent and the Custodian have advised the
Fund that they have been actively working on necessary changes to their computer
systems to prepare for the year 2000 and expect that their systems, and those of
outside service providers, will be adapted in time for the event.
    
 
   
  Additionally, issuers of securities generally as well as those purchased by
the Fund may confront year 2000 compliance issues which, if material and not
resolved, could have an adverse impact on securities markets and/or a specific
issuer's performance and result in a decline in the value of securities held by
the Fund.
    
 
                         HOW THE FUND VALUES ITS SHARES
 
   
  THE SERIES' NET ASSET VALUE PER SHARE OR NAV IS DETERMINED BY SUBTRACTING ITS
LIABILITIES FROM THE VALUE OF ITS ASSETS AND DIVIDING THE REMAINDER BY THE
NUMBER OF OUTSTANDING SHARES. NAV IS CALCULATED SEPARATELY FOR EACH CLASS. THE
TRUSTEES HAVE FIXED THE SPECIFIC TIME OF DAY FOR THE COMPUTATION OF THE NAV OF
THE SERIES TO BE AS OF 4:15 P.M., NEW YORK TIME.
    
 
  Portfolio securities are valued based on market quotations or, if not readily
available, at fair value as determined in good faith under procedures
established by the Trustees. Securities may also be valued based on values
provided by a pricing service. See "Net Asset Value" in the Statement of
Additional Information.
 
  The Series will compute its NAV once daily on days that the New York Stock
Exchange is open for trading except on days on which no orders to purchase, sell
or redeem shares have been received by the Series or days on which changes in
the value of the Series' portfolio securities do not materially affect the NAV.
 
                                       17

   
  Although the legal rights of each class of shares are substantially identical,
the different expenses borne by each class will result in different NAV's and
dividends. The NAV of Class B and Class C shares will generally be lower than
the NAV of Class A shares as a result of the larger distribution-related fee to
which Class B and Class C shares are subject. It is expected, however, that the
NAV of the three classes will tend to converge immediately after the recording
of dividends, if any, which will differ by approximately the amount of the
distribution and/or service fee expense accrual differential among the classes.
    
 
                      HOW THE FUND CALCULATES PERFORMANCE
 
  FROM TIME TO TIME THE FUND MAY ADVERTISE THE YIELD, TAX EQUIVALENT YIELD AND
AVERAGE ANNUAL TOTAL RETURN AND AGGREGATE TOTAL RETURN OF THE SERIES IN
ADVERTISEMENTS OR SALES LITERATURE. YIELD, TAX EQUIVALENT YIELD AND TOTAL RETURN
ARE CALCULATED SEPARATELY FOR CLASS A, CLASS B AND CLASS C SHARES. THESE FIGURES
ARE BASED ON HISTORICAL EARNINGS AND ARE NOT INTENDED TO INDICATE FUTURE
PERFORMANCE. The yield refers to the income generated by an investment in the
Series over a one-month or 30-day period. This income is then annualized; that
is, the amount of income generated by the investment during that 30-day period
is assumed to be generated each 30-day period for twelve periods and is shown as
a percentage of the investment. The income earned on the investment is also
assumed to be reinvested at the end of the sixth 30-day period. The tax
equivalent yield is calculated similarly to the yield, except that the yield is
increased using a stated income tax rate to demonstrate the taxable yield
necessary to produce an after-tax yield equivalent to the Series. The total
return shows how much an investment in the Series would have increased
(decreased) over a specified period of time (I.E., one, five or ten years or
since inception of the Series) assuming that all distributions and dividends by
the Series were reinvested on the reinvestment dates during the period and less
all recurring fees. The aggregate total return reflects actual performance over
a stated period of time. Average annual total return is a hypothetical rate of
return that, if achieved annually, would have produced the same aggregate total
return if performance had been constant over the entire period. Average annual
total return smooths out variations in performance and takes into account any
applicable initial or contingent deferred sales charges. Neither average annual
total return nor aggregate total return takes into account any federal or state
income taxes which may be payable upon redemption. The Fund also may include
comparative performance information in advertising or marketing the shares of
the Series. Such performance information may include data from Lipper Analytical
Services, Inc., Morningstar Publications, Inc., other industry publications,
business periodicals and market indices. See "Performance Information" in the
Statement of Additional Information. Further performance information is
contained in the Series' annual and semi-annual reports to shareholders, which
may be obtained without charge. See "Shareholder Guide--Shareholder
Services--Reports to Shareholders."
 
                       TAXES, DIVIDENDS AND DISTRIBUTIONS
 
TAXATION OF THE FUND
 
   
  THE SERIES HAS QUALIFIED AND INTENDS TO REMAIN QUALIFIED AS A REGULATED
INVESTMENT COMPANY UNDER THE INTERNAL REVENUE CODE. ACCORDINGLY, THE SERIES WILL
NOT BE SUBJECT TO FEDERAL INCOME TAXES ON ITS NET INVESTMENT INCOME AND NET
CAPITAL GAINS, IF ANY, THAT IT DISTRIBUTES TO ITS SHAREHOLDERS. TO THE EXTENT
NOT DISTRIBUTED BY THE SERIES, NET TAXABLE INVESTMENT INCOME AND CAPITAL GAINS
AND LOSSES ARE TAXABLE TO THE SERIES. See "Taxes, Dividends and Distributions"
in the Statement of Additional Information.
    
 
   
  To the extent the Series invests in taxable obligations, it will earn taxable
investment income. Also, to the extent the Series sells securities or engages in
hedging transactions in futures contracts and options thereon, it may earn both
capital gain or loss. Capital gain or loss may also arise upon the sale of
municipal securities, as well as taxable obligations. Under the Internal Revenue
Code, special rules apply to the treatment of certain options and futures
contracts (Section 1256 contracts). At the end of each year, such investments
held by the Series will be required to be marked to market for federal income
tax purposes; that is,
    
 
                                       18

   
treated as having been sold at market value. Sixty percent of any gain or loss
recognized on these deemed sales and on actual dispositions will be treated as
long-term capital gain or loss, and the remainder will be treated as short-term
capital gain or loss. See "Taxes, Dividends and Distributions" in the Statement
of Additional Information.
    
 
   
  Gain or loss realized by the Series from the sale of securities generally will
be treated as capital gain or loss; however, gain from the sale of certain
securities (including municipal obligations) will be treated as taxable ordinary
income to the extent of any market discount. Market discount generally is the
difference, if any, between the price paid by the Series for the security and
the principal amount of the security (or, in the case of a security issued at an
original issue discount, the revised issue price of the security). The market
discount rule does not apply to any security that was acquired by the Series at
its original issue.
    
 
TAXATION OF SHAREHOLDERS
 
  In general, the character of tax-exempt interest distributed by the Series
will flow through as tax-exempt interest to its shareholders provided that 50%
or more of the value of its assets at the end of each quarter of its taxable
year is invested in state, municipal and other obligations, the interest on
which is excluded from gross income for federal income tax purposes. During
normal market conditions, at least 80% of the Series' total assets will be
invested in such obligations. See "How the Fund Invests--Investment Objective
and Policies."
 
   
  Any dividends out of net taxable investment income, together with
distributions of net short-term gains (I.E., the excess of net short-term
capital gains over net long-term capital losses) distributed to shareholders,
will be taxable as ordinary income to the shareholder whether or not reinvested.
Any net capital gains (I.E., the excess of net capital gains from the sale of
assets held for more than 12 months over net short-term capital losses)
distributed to shareholders will be taxable as capital gains to the
shareholders, whether or not reinvested and regardless of the length of time a
shareholder has owned his or her shares. Recent legislation created various
categories of capital gains applicable to individuals. For capital gains
recognized upon the sale of assets by this series after December 31, 1997, the
maximum long-term capital gains tax rate for individuals is 20%. The maximum
capital gains tax rate for corporate shareholders currently is the same as the
maximum tax rate for ordinary income.
    
 
   
  Any gain or loss realized upon a sale or redemption of Series shares by a
shareholder who is not a dealer in securities will be treated as capital gain or
loss. Any such capital gain or loss will be treated as long-term capital gain or
loss if the shares were held for more than 12 months. In the case of an
individual, any such long-term capital gain will be taxable at the maximum rate
of 20%. The maximum capital gain tax rate for a corporation is the same as that
for ordinary income. Any loss with respect to shares that are held for six
months or less, however, will be treated as long-term capital loss to the extent
of any capital gain distributions received by the shareholder. In addition, any
short-term capital loss will be disallowed to the extent of any tax-exempt
dividends received by the shareholder on shares that are held for six months or
less.
    
 
  The Fund has obtained opinions of counsel to the effect that neither (i) the
conversion of Class B shares into Class A shares nor (ii) the exchange of Class
B or Class C shares for Class A shares constitutes a taxable event for federal
income tax purposes. However, such opinions are not binding on the Internal
Revenue Service.
 
  CERTAIN INVESTORS MAY INCUR FEDERAL ALTERNATIVE MINIMUM TAX LIABILITY AS A
RESULT OF THEIR INVESTMENT IN THE FUND. Tax-exempt interest from certain
municipal obligations (I.E., certain private activity bonds issued after August
7, 1986) will be treated as an item of tax preference for purposes of the
alternative minimum tax. The Fund anticipates that, under regulations to be
promulgated, items of tax preference incurred by the Series will be attributed
to the Series' shareholders, although some portion of such items could be
allocated to the Series itself. Depending upon each shareholder's individual
circumstances, the attribution of items of tax preference incurred by the Series
could result in liability for the shareholder for the alternative minimum tax.
Similarly, the Series could be liable for the alternative minimum tax for items
of tax preference attributed to it. The Series is permitted to invest in
municipal obligations of the type that will produce items of tax preference.
 
                                       19

   
  Distributions relating to interest on all municipal obligations will be
included in a corporate shareholder's current earnings for purposes of the
adjustment for current earnings for alternative minimum tax purposes. Corporate
shareholders should consult with
their tax advisers with respect to this potential adjustment.
    
 
  Under Michigan law, dividends paid by the Series that are derived from
interest payments attributable to Michigan Obligations are exempt from Michigan
income tax and any income taxes imposed by cities in Michigan for individuals
who reside in Michigan and from the Michigan single business tax for
corporations that are subject to such tax to the extent such dividends are
exempt from federal income tax (except for possible application of the
alternative minimum tax). An investment in the Series, to the extent
attributable to interest on Michigan Obligations, will also be excluded from the
Michigan intangibles tax.
 
   
  Shareholders are advised to consult their own tax advisers regarding specific
questions as to federal, state or local taxes. See "Taxes, Dividends and
Distributions" in the Statement of Additional Information.
    
 
WITHHOLDING TAXES
 
  Under the Internal Revenue Code, the Series is required to withhold and remit
to the U.S. Treasury 31% of redemption proceeds on the accounts of certain
shareholders who fail to furnish their tax identification numbers on IRS Form
W-9 (or IRS Form W-8 in the case of certain foreign shareholders) with the
required certifications regarding the shareholder's status under the federal
income tax law. Such withholding is also required on taxable dividends and
capital gain distributions made by the Series unless it is reasonably expected
that at least 95% of the distributions of the Series are comprised of tax-exempt
dividends.
 
  Dividends of net taxable investment income and distributions of net short-term
capital gains paid to a shareholder (including a shareholder acting as a nominee
or fiduciary) who is a nonresident alien individual, a foreign corporation or a
foreign partnership (foreign shareholder) are subject to a 30% (or lower treaty
rate) withholding tax upon the gross amount of the dividends unless the
dividends are effectively connected with a U.S. trade or business conducted by
the foreign shareholder. Capital gain dividends paid to a foreign shareholder
are generally not subject to withholding tax. A foreign shareholder will,
however, be required to pay U.S. income tax on any dividends and capital gain
distributions which are effectively connected with a U.S. trade or business of
the foreign shareholder.
 
DIVIDENDS AND DISTRIBUTIONS
 
  THE SERIES EXPECTS TO DECLARE DAILY AND PAY MONTHLY DIVIDENDS OF NET
INVESTMENT INCOME, IF ANY, AND MAKE DISTRIBUTIONS AT LEAST ANNUALLY OF ANY
CAPITAL GAINS IN EXCESS OF CAPITAL LOSSES. Dividends paid by the Series with
respect to each class of shares, to the extent any dividends are paid, will be
calculated in the same manner, at the same time, on the same day and will be in
the same amount except that each class will bear its own distribution charges,
generally resulting in lower dividends for Class B and Class C shares.
Distributions of net capital gains, if any, will be paid in the same amount for
each class of shares. See "How the Fund Values its Shares."
 
   
  DIVIDENDS AND DISTRIBUTIONS WILL BE PAID IN ADDITIONAL SHARES OF THE SERIES
BASED ON THE NAV OF EACH CLASS OF THE SERIES ON THE PAYMENT DATE AND RECORD
DATE, RESPECTIVELY, OR SUCH OTHER DATE AS THE TRUSTEES MAY DETERMINE, UNLESS THE
SHAREHOLDER ELECTS IN WRITING NOT LESS THAN FIVE BUSINESS DAYS PRIOR TO THE
RECORD DATE TO RECEIVE SUCH DIVIDENDS AND DISTRIBUTIONS IN CASH. Such election
should be submitted to Prudential Mutual Fund Services LLC, Attention: Account
Maintenance, P.O. Box 15015, New Brunswick, New Jersey 08906-5015. The Fund will
notify each shareholder after the close of the Fund's taxable year of both the
dollar amount and the taxable status of that year's dividends and distributions
on a per share basis.
    
 
   
  IF YOU BUY SHARES ON OR IMMEDIATELY BEFORE THE RECORD DATE (THE DATE THAT
DETERMINES WHO RECEIVES THE DIVIDEND), YOU WILL RECEIVE A PORTION OF THE MONEY
YOU INVESTED AS A TAXABLE DIVIDEND. THEREFORE, YOU SHOULD CONSIDER THE TIMING OF
DIVIDENDS WHEN BUYING SHARES OF THE FUND.
    
 
                                       20

                              GENERAL INFORMATION
 
DESCRIPTION OF SHARES
 
  THE FUND WAS ESTABLISHED AS A MASSACHUSETTS BUSINESS TRUST ON MAY 18, 1984, BY
A DECLARATION OF TRUST. The Fund's activities are supervised by its Trustees.
The Declaration of Trust permits the Trustees to issue an unlimited number of
full and fractional shares in separate series, currently designated as the
Connecticut Money Market Series, Florida Series, Maryland Series, Massachusetts
Series, Massachusetts Money Market Series, Michigan Series, New Jersey Series,
New Jersey Money Market Series, New York Series, New York Money Market Series,
North Carolina Series, Ohio Series and Pennsylvania Series. The Series is
authorized to issue an unlimited number of shares, divided into three classes,
designated Class A, Class B and Class C. Each class of shares represents an
interest in the same assets of the Series and are identical in all respects
except that (i) each class is subject to different sales charges and
distribution and/or service fees, which may affect performance, (ii) each class
has exclusive voting rights on any matter submitted to shareholders that relates
solely to its arrangement and has separate voting rights on any matter submitted
to shareholders in which the interests of one class differ from the interests of
any other class, (iii) each class has a different exchange privilege and (iv)
only Class B shares have a conversion feature. See "How the Fund is
Managed--Distributor." In accordance with the Fund's Declaration of Trust, the
Trustees may authorize the creation of additional series and classes within such
series, with such preferences, privileges, limitations and voting and dividend
rights as the Trustees may determine.
 
  Shares of the Fund, when issued, are fully paid, nonassessable, fully
transferable and redeemable at the option of the holder. Shares are also
redeemable at the option of the Fund under certain circumstances as described
under "Shareholder Guide--How to Sell Your Shares." Each share of each class of
the Series is equal as to earnings, assets and voting privileges, except as
noted above, and each class bears the expenses related to the distribution of
its shares. Except for the conversion feature applicable to the Class B shares,
there are no conversion, preemptive or other subscription rights. In the event
of liquidation, each share of beneficial interest of each series is entitled to
its portion of all of the Fund's assets after all debt and expenses of the Fund
have been paid. Since Class B and Class C shares generally bear higher
distribution expenses than Class A shares, the liquidation proceeds to
shareholders of those classes are likely to be lower than to Class A
shareholders. The Fund's shares do not have cumulative voting rights for the
election of Trustees.
 
  THE FUND DOES NOT INTEND TO HOLD ANNUAL MEETINGS OF SHAREHOLDERS UNLESS
OTHERWISE REQUIRED BY LAW. THE FUND WILL NOT BE REQUIRED TO HOLD MEETINGS OF
SHAREHOLDERS UNLESS, FOR EXAMPLE, THE ELECTION OF TRUSTEES IS REQUIRED TO BE
ACTED UPON BY SHAREHOLDERS UNDER THE INVESTMENT COMPANY ACT. SHAREHOLDERS HAVE
CERTAIN RIGHTS, INCLUDING THE RIGHT TO CALL A MEETING UPON A VOTE OF 10% OF THE
FUND'S OUTSTANDING SHARES FOR THE PURPOSE OF VOTING ON THE REMOVAL OF ONE OR
MORE TRUSTEES OR TO TRANSACT ANY OTHER BUSINESS.
 
  The Declaration of Trust and the By-Laws of the Fund are designed to make the
Fund similar in certain respects to a Massachusetts business corporation. The
principal distinction between a Massachusetts business corporation and a
Massachusetts business trust relates to shareholder liability. Under
Massachusetts law, shareholders of a business trust may, under certain
circumstances, be held personally liable as partners for the obligations of the
fund, which is not the case with a corporation. The Declaration of Trust of the
Fund provides that shareholders shall not be subject to any personal liability
for the acts or obligations of the Fund and that every written obligation,
contract, instrument or undertaking made by the Fund shall contain a provision
to the effect that the shareholders are not individually bound thereunder.
 
ADDITIONAL INFORMATION
 
   
  This Prospectus, including the Statement of Additional Information which has
been incorporated by reference herein, does not contain all the information set
forth in the Registration Statement filed by the Fund with the Commission under
the Securities Act. Copies of the Registration Statement may be obtained at a
reasonable charge from the Commission or may be examined, without charge, at the
office of the Commission in Washington, D.C.
    
 
                                       21

                               SHAREHOLDER GUIDE
 
HOW TO BUY SHARES OF THE FUND
 
   
  The Trustees of the Fund have recently approved a proposal to exchange the
assets and liabilities of the Series of the Fund for shares of Prudential
National Municipals Fund, Inc. (National Municipals Fund). Class A, Class B and
Class C shares of the Series would be exchanged at relative net asset value for
Class A shares of National Municipals Fund, the investment objective of which is
to seek a high level of current income exempt from federal income taxes. The
transfer has been approved by the Trustees of the Fund and by the Board of
Directors of National Municipals Fund and is subject to approval by the
shareholders of the Series. It is anticipated that a proxy statement/prospectus
relating to the transaction will be mailed to the Series' shareholders in late
October 1998.
    
 
   
  Under the terms of the proposal, shareholders of the Series would become
shareholders of National Municipals Fund. No sales charge would be imposed on
the proposed transfer. The Fund anticipates obtaining an opinion of its counsel
that the transaction would be a tax-free reorganization under the Internal
Revenue Code and therefore no gain or loss for Federal income tax purposes would
be recognized by shareholders of the Series.
    
 
   
  EFFECTIVE IMMEDIATELY, THE FUND WILL NO LONGER ACCEPT ORDERS TO PURCHASE OR
EXCHANGE FOR SHARES OF THE SERIES, EXCEPT FOR PURCHASES BY CERTAIN RETIREMENT
AND EMPLOYEE PLANS (EXCLUDING IRA ACCOUNTS). Existing shareholders may continue
to acquire shares through dividend reinvestment. The current redemption
privilege and the current exchange privilege of obtaining shares of other
Prudential Mutual Funds will remain in effect until the transaction is
consummated. If the transaction is not consummated, the Fund will resume
accepting orders to purchase or exchange for shares of the Series. See "How to
Sell Your Shares" and "How to Exchange Your Shares" below.
    
 
   
  IF THE FUND RESUMES ACCEPTING ORDERS TO PURCHASE SHARES OF THE SERIES, YOU MAY
PURCHASE SHARES OF THE SERIES THROUGH THE DISTRIBUTOR, THROUGH DEALERS,
INCLUDING PRUDENTIAL SECURITIES OR PRUSEC, OR DIRECTLY FROM THE FUND THROUGH ITS
TRANSFER AGENT, PRUDENTIAL MUTUAL FUND SERVICES LLC (PMFS OR THE TRANSFER
AGENT), ATTENTION: INVESTMENT SERVICES, P.O. BOX 15020, NEW BRUNSWICK, NEW
JERSEY 08906-5020. The purchase price is the NAV next determined following
receipt of an order in proper form (in accordance with procedures established by
the Transfer Agent in connection with investors' accounts) by the Distributor,
your Dealer or the Transfer Agent plus a sales charge which, at your option, may
be imposed either at the time of purchase, on a deferred basis, or both. Class A
shares are sold with a front-end sales charge. Class B shares are subject to a
CDSC. Class C shares are sold with a low front-end sales charge, but are also
subject to a CDSC. Payments may be made by wire, check or through your brokerage
account. See "Alternative Purchase Plan" below and "How the Fund Values its
Shares."
    
 
  An investment in the Series may not be appropriate for tax-exempt or
tax-deferred investors. Such investors should consult their own tax advisers.
 
   
  The minimum initial investment is $1,000 for Class A and Class B shares and
$2,500 for Class C shares. The minimum subsequent investment is $100 for all
classes. All minimum investment requirements are waived for certain employee
savings plans. For purchases made through the Automatic Investment Plan, the
minimum initial and subsequent investment is $50. See "Shareholder Services"
below.
    
 
  The Fund reserves the right to reject any purchase order (including an
exchange into the Series) or to suspend or modify the continuous offering of its
shares. See "How to Sell Your Shares" below.
 
   
  Application forms can be obtained from the Transfer Agent, your Dealer or the
Distributor. If a share certificate is desired, it must be requested in writing
for each transaction. Certificates are issued only for full shares. Shareholders
who hold their shares through Prudential Securities will not receive share
certificates.
    
 
                                       22

   
  Your Dealer is responsible for forwarding payment promptly to the Fund. The
Distributor reserves the right to cancel any purchase order for which payment
has not been received by the third business day following the placement of the
order.
    
 
   
  Dealers may charge their customers a separate fee for processing purchases and
redemptions. In addition, transactions in shares of the Series may be subject to
postage and handling charges imposed by your Dealer. Any such charge is retained
by the Dealer and is not remitted to the Fund.
    
 
  PURCHASE BY WIRE. For an initial purchase of shares of the Series by wire, you
must first telephone PMFS at (800) 225-1852 (toll-free) to receive an account
number. The following information will be requested: your name, address, tax
identification number, class election, dividend distribution election, amount
being wired and wiring bank. Instructions should then be given by you to your
bank to transfer funds by wire to State Street Bank and Trust Company (State
Street), Boston, Massachusetts, Custody and Shareholder Services Division,
Attention: Prudential Municipal Series Fund (Michigan Series), specifying on the
wire the account number assigned by PMFS and your name and identifying the class
in which you are eligible to invest (Class A, Class B or Class C shares) and the
name of the Series.
 
   
  If you arrange for receipt by State Street of federal funds prior to the
calculation of NAV (4:15 P.M., New York time), on a business day, you may
purchase shares of the Series as of that day. See "Net Asset Value" in the
Statement of Additional Information.
    
 
   
  In making a subsequent purchase order by wire, you should wire State Street
directly and should be sure that the wire specifies Prudential Municipal Series
Fund, (Michigan Series), Class A, Class B or Class C shares and your name and
individual account number. It is not necessary to call PMFS to make subsequent
purchase orders utilizing federal funds. The minimum amount which may be
invested by wire is $1,000.
    
 
ALTERNATIVE PURCHASE PLAN
 
   
  THE FUND OFFERS THROUGH THIS PROSPECTUS THREE CLASSES OF SHARES (CLASS A,
CLASS B AND CLASS C SHARES) WHICH ALLOWS YOU TO CHOOSE THE MOST BENEFICIAL SALES
CHARGE STRUCTURE FOR YOUR INDIVIDUAL CIRCUMSTANCES, GIVEN THE AMOUNT OF THE
PURCHASE, THE LENGTH OF TIME YOU EXPECT TO HOLD THE SHARES AND OTHER RELEVANT
CIRCUMSTANCES (ALTERNATIVE PURCHASE PLAN).
    
 
   


                                                            ANNUAL 12b-1 FEES
                                                           (AS A % OF AVERAGE
                        SALES CHARGE                        DAILY NET ASSETS)                     OTHER INFORMATION
             -----------------------------------   -----------------------------------   -----------------------------------
                                                                                
CLASS A      Maximum initial sales charge of 3%    .30 of 1%                             Initial sales charge waived or
             of the public offering price                                                reduced for certain purchases
 
CLASS B      Maximum contingent deferred sales     .50 of 1%                             Shares convert to Class A shares
             charge or CDSC of 5% of the lesser                                          approximately seven years after
             of the amount invested or the                                               purchase
             redemption proceeds; declines to
             zero after six years
 
CLASS C      Maximum initial sales charge of 1%    1%                                    Shares do not convert to another
             of the public offering price and                                            class
             maximum CDSC of 1% of the lesser of
             the amount invested or the
             redemption proceeds on redemptions
             made within 18 months of purchase

    
 
   
  The three classes of shares represent an interest in the same portfolio of
investments of the Series and have the same rights, except that (i) each class
is subject to different sales charges and distribution and/or service fees which
may affect performance, (ii) each class has exclusive voting rights on any
matter submitted to shareholders that relates solely to its arrangement and has
separate voting rights on any matter submitted to shareholders in which the
interests of one class differ from the interests of any
    
 
                                       23

   
other class, (iii) each class has a different exchange privilege, and (iv) only
Class B shares have a conversion feature. See "How to Exchange Your Shares"
below. The income attributable to each class and the dividends payable on the
shares of each class will be reduced by the amount of the distribution fee (if
any) of each class. Class B and Class C shares bear the expenses of a higher
distribution fee which will generally cause them to have higher expense ratios
and to pay lower dividends than the Class A shares.
    
 
   
  Dealers, financial advisers and other sales agents who sell shares of the
Series will receive different compensation for selling Class A, Class B and
Class C shares and will generally receive more compensation initially for
selling Class A and Class B shares than for selling Class C shares.
    
 
  IN SELECTING A PURCHASE ALTERNATIVE, YOU SHOULD CONSIDER, AMONG OTHER THINGS,
(1) the length of time you expect to hold your investment, (2) the amount of any
applicable sales charge (whether imposed at the time of purchase or redemption)
and distribution-related fees, as noted above, (3) whether you qualify for any
reduction or waiver of any applicable sales charge, (4) the various exchange
privileges among the different classes of shares (see "How to Exchange Your
Shares" below) and (5) the fact that Class B shares automatically convert to
Class A shares approximately seven years after purchase (see "Conversion
Feature--Class B Shares" below).
 
   
  The following is provided to assist you in determining which method of
purchase best suits your individual circumstances and is based on current fees
and expenses being charged to the Series:
    
 
   
  If you intend to hold your investment in a Fund for less than 3 years and do
not qualify for a reduced sales charge on Class A shares, since Class A shares
are subject to a maximum initial sales charge of 3% and Class B shares are
subject to a CDSC of 5% which declines to zero over a 6 year period, you should
consider purchasing Class C shares over either Class A or Class B shares.
    
 
   
  If you intend to hold your investment for more than 3 years, but less than 4
years, or for more than 5 years, but less than 6 years, you should consider
purchasing Class A shares, because the maximum 3% initial sales charge plus the
cumulative annual distribution-related fee on Class A would be lower than: (i)
the CDSC plus the cumulative annual distribution-related fee on Class B shares;
and (ii) the 1% initial sales charge plus the cumulative annual
distribution-related fee on Class C shares.
    
 
   
  If you intend to hold your investment for more than 4 years, but less than 5
years, you may consider purchasing Class A or Class B shares because: (i) the
maximum 3% initial sales charge plus the cumulative annual distribution-related
fee on Class A shares and (ii) the CDSC plus the cumulative annual
distribution-related fee on Class B shares would be lower than 1% initial sales
charge plus the cumulative annual distribution-related fee on Class C shares.
    
 
   
  If you intend to hold your investment for more than 6 years and do not qualify
for a reduced sales charge on Class A shares, since Class B shares convert to
Class A shares approximately 7 years after purchase and because all of your
money would be invested initially in the case of Class B shares, you should
consider purchasing Class B shares over either Class A or Class C shares.
    
 
   
  If you qualify for a reduced sales charge on Class A shares, it may be more
advantageous for you to purchase Class A shares over either Class B or Class C
shares regardless of how long you intend to hold your investment. However,
unlike Class B shares, you would not have all of your money invested initially
because the sales charge on Class A shares is deducted at the time of purchase.
    
 
   
  If you do not qualify for a reduced sales charge on Class A shares and you
purchase Class C shares, you would have to hold your investment for more than 3
years for the 1% initial sales charge plus the higher cumulative annual
distribution-related fee on the Class C shares to exceed the initial sales
charge plus cumulative annual distribution-related fees on Class A shares. This
does not take into account the time value of money, which further reduces the
impact of the higher Class C distribution-related fee on the investment,
fluctuations in NAV, the effect of the return on the investment over this period
of time or redemptions when the CDSC is applicable.
    
 
                                       24

   
  ALL PURCHASES OF $1 MILLION OR MORE, EITHER AS PART OF A SINGLE INVESTMENT OR
UNDER RIGHTS OF ACCUMULATION OR LETTERS OF INTENT, MUST BE FOR CLASS A SHARES.
See "Reduction and Waiver of Initial Sales Charges" below.
    
 
  CLASS A SHARES
 
  The offering price of Class A shares for investors choosing the initial sales
charge alternative is the next determined NAV plus a sales charge (expressed as
a percentage of the offering price and of the amount invested) as shown in the
following table:
 


                                    SALES CHARGE AS   SALES CHARGE AS   DEALER CONCESSION
                                     PERCENTAGE OF     PERCENTAGE OF    AS PERCENTAGE OF
             AMOUNT OF PURCHASE     OFFERING PRICE    AMOUNT INVESTED    OFFERING PRICE
          ------------------------  ---------------   ---------------   -----------------
                                                               
          Less than $99,999              3.00%             3.09%              3.00%
          $100,000 to $249,999           2.50              2.56               2.50
          $250,000 to $499,999           1.50              1.52               1.50
          $500,000 to $999,999           1.00              1.01               1.00
          $1,000,000 and above           None              None               None

 
   
  The Distributor may reallow the entire initial sales charge to Dealers.
Dealers may be deemed to be underwriters, as that term is defined under federal
securities laws. The Distributor reserves the right, without prior notice to any
Dealer, to suspend or eliminate Dealer concessions or commissions.
    
 
   
  In connection with the sale of Class A shares at NAV (without payment of an
initial sales charge), the Manager, the Distributor or one of their affiliates
may pay Dealers, financial advisers and other persons which distribute shares a
finders' fee from their own resources based on a percentage of the NAV of shares
sold by such persons.
    
 
  REDUCTION AND WAIVER OF INITIAL SALES CHARGES. Reduced sales charges are
available through Rights of Accumulation and Letters of Intent. Shares of the
Fund and shares of other Prudential Mutual Funds (excluding money market funds
other than those acquired pursuant to the exchange privilege) may be aggregated
to determine the applicable reduction. See "Purchase and Redemption of Fund
Shares--Reduction and Waiver of Initial Sales Charges--Class A Shares" in the
Statement of Additional Information.
 
   
  OTHER WAIVERS. Class A shares may be purchased at NAV, through the Distributor
or the Transfer Agent, by the following persons: (a) officers of the Prudential
Mutual Funds (including the Fund), (b) employees of the Distributor, Prudential
Securities, PIFM and their subsidiaries and members of the families of such
persons who maintain an employee related account at Prudential Securities or the
Transfer Agent, (c) employees of subadvisers of the Prudential Mutual Funds
provided that the purchases at NAV are permitted by such person's employer, (d)
Prudential, employees and special agents of Prudential and its subsidiaries and
all persons who have retired directly from active service with Prudential or one
of its subsidiaries, (e) registered representatives and employees of Dealers who
have entered into a selected dealer agreement with the Distributor, provided
that purchases at NAV are permitted by such person's employer and (f) investors
who have a business relationship with a financial adviser who joined Prudential
Securities from another investment firm, provided that (i) the purchase is made
within 180 days of the commencement of the financial adviser's employment at
Prudential Securities or within one year in the case of benefit plans, (ii) the
purchase is made with proceeds of a redemption of shares of any open-end
non-money market fund sponsored by the financial adviser's previous employer
(other than a fund which imposes a distribution or service fee of .25 of 1% or
less) and (iii) the financial adviser served as the client's broker on the
previous purchases.
    
 
   
  For an investor to obtain any reduction or waiver of the initial sales
charges, at the time of the sale either the Transfer Agent must be notified
directly by the investor or the Distributor must be notified by the Dealer
facilitating the transaction that the sale qualifies for the reduced or waived
sales charge. The reduction or waiver will be granted subject to confirmation of
your
    
 
                                       25

entitlement. No initial sales charges are imposed upon Class A shares acquired
upon the reinvestment of dividends and distributions. See "Purchase and
Redemption of Fund Shares--Reduction and Waiver of Initial Sales Charges--Class
A Shares" in the Statement of Additional Information.
 
   
  CLASS B AND CLASS C SHARES
    
 
   
  The offering price of Class B shares is the NAV next determined following
receipt of an order in proper form by the Transfer Agent, your Dealer or the
Distributor. The offering price of Class C shares is the NAV next determined
following receipt of an order in proper form by the Transfer Agent, your Dealer
or the Distributor plus a sales charge equal to 1% of the public offering price.
Redemption of Class B and Class C shares may be subject to a CDSC. See "How to
Sell Your Shares--Contingent Deferred Sales Charges."
    
 
   
  The Distributor will pay, from its own resources, sales commissions of up to
4% of the purchase price of Class B shares to Dealers, financial advisers and
other persons who sell Class B shares at the time of sale. This facilitates the
ability of the Trust to sell the Class B shares of the Funds without an initial
sales charge being deducted at the time of purchase. The Distributor anticipates
that it will recoup its advancement of sales commissions from the combination of
the CDSC and the distribution fee. In connection with the sale of Class C
shares, the Distributor will pay, partially from its own resources, Dealers,
financial advisers and other persons which distribute Class C shares a sales
commission of up to 2% of the purchase price at the time of the sale. The
Distributor anticipates that it would recoup its advancement of sales
commissions from the combination of the CDSC and the distribution fee. See "How
the Fund is Managed--Distributor."
    
 
   
  WAIVER OF INITIAL SALES CHARGE--CLASS C SHARES
    
 
   
  INVESTMENTS OF REDEMPTION PROCEEDS FROM OTHER INVESTMENT COMPANIES. Investors
may purchase Class C shares at NAV, without the initial sales charge, with the
proceeds from the redemption of shares of any unaffiliated registered investment
company which were not held through an account with any Prudential affiliate.
Such purchases must be made within 60 days of the redemption. Investors eligible
for this waiver include: (i) investors purchasing shares through an account at
Prudential Securities Incorporated; (ii) investors purchasing shares through an
ADVANTAGE Account or an Investor Account with Pruco Securities Corporation; and
(iii) investors purchasing shares through other Dealers. This waiver is not
available to investors who purchase shares directly from the Transfer Agent. You
must notify the Transfer Agent directly or through your Dealer if you are
entitled to this waiver and provide the Transfer Agent with such supporting
documents as it may deem appropriate.
    
 
HOW TO SELL YOUR SHARES
 
   
  YOU CAN REDEEM YOUR SHARES OF THE SERIES AT ANY TIME FOR CASH AT THE NAV NEXT
DETERMINED AFTER THE REDEMPTION REQUEST IS RECEIVED IN PROPER FORM (IN
ACCORDANCE WITH PROCEDURES ESTABLISHED BY THE TRANSFER AGENT IN CONNECTION WITH
INVESTORS' ACCOUNTS) BY THE DISTRIBUTOR, YOUR DEALER OR THE TRANSFER AGENT. SEE
"HOW THE FUND VALUES ITS SHARES." In certain cases, however, redemption proceeds
will be reduced by the amount of any applicable CDSC, as described below. See
"Contingent Deferred Sales Charges" below. If you are redeeming your shares
through a Dealer, your Dealer must receive your sell order before the Fund
computes its NAV for that day (I.E., 4:15 p.m., New York time) in order to
receive that day's NAV. Your Dealer will be responsible for furnishing all
necessary documentation to the Distributor and may charge you for its services
in connection with redeeming shares of the Fund.
    
 
   
  IF YOU HOLD SHARES IN NON-CERTIFICATE FORM, A WRITTEN REQUEST FOR REDEMPTION
SIGNED BY YOU EXACTLY AS THE ACCOUNT IS REGISTERED IS REQUIRED. IF YOU HOLD
CERTIFICATES, THE CERTIFICATES, SIGNED IN THE NAME(S) SHOWN ON THE FACE OF THE
CERTIFICATES, MUST BE RECEIVED BY THE TRANSFER AGENT, THE DISTRIBUTOR OR YOUR
DEALER IN ORDER FOR THE REDEMPTION REQUEST TO BE PROCESSED. IF REDEMPTION IS
REQUESTED BY A CORPORATION, PARTNERSHIP, TRUST OR FIDUCIARY, WRITTEN EVIDENCE
    
 
                                       26

   
OF AUTHORITY ACCEPTABLE TO THE TRANSFER AGENT MUST BE SUBMITTED BEFORE SUCH
REQUEST WILL BE ACCEPTED. All correspondence and documents concerning
redemptions should be sent to the Fund in care of its Transfer Agent, Prudential
Mutual Fund Services LLC, Attention: Redemption Services, P.O. Box 15010, New
Brunswick, New Jersey 08906-5010, the Distributor or your Dealer.
    
 
   
  If the proceeds of the redemption (a) exceed $50,000, (b) are to be paid to a
person other than the record owner, (c) are to be sent to an address other than
the address on the Transfer Agent's records, or (d) are to be paid to a
corporation, partnership, trust or fiduciary, the signature(s) on the redemption
request and on the certificates, if any, or stock power must be guaranteed by an
eligible guarantor institution. An eligible guarantor institution includes any
bank, broker, dealer or credit union. The Transfer Agent reserves the right to
request additional information from, and make reasonable inquiries of, any
eligible guarantor institution.
    
 
   
  PAYMENT FOR SHARES PRESENTED FOR REDEMPTION WILL BE MADE BY CHECK WITHIN SEVEN
DAYS AFTER RECEIPT BY THE TRANSFER AGENT, THE DISTRIBUTOR OR YOUR DEALER OF THE
CERTIFICATE AND/OR WRITTEN REQUEST EXCEPT AS INDICATED BELOW. IF YOU HOLD SHARES
THROUGH A DEALER, PAYMENT FOR SHARES PRESENTED FOR REDEMPTION WILL BE CREDITED
TO YOUR ACCOUNT AT YOUR DEALER UNLESS YOU INDICATE OTHERWISE. Such payment may
be postponed or the right of redemption suspended at times (a) when the New York
Stock Exchange is closed for other than customary weekends and holidays, (b)
when trading on such Exchange is restricted, (c) when an emergency exists as a
result of which disposal by the Series of securities owned by it is not
reasonably practicable or it is not reasonably practicable for the Series fairly
to determine the value of its net assets, or (d) during any other period when
the Commission, by order, so permits; provided that applicable rules and
regulations of the Commission shall govern as to whether the conditions
prescribed in (b), (c) or (d) exist.
    
 
   
  PAYMENT FOR REDEMPTION OF RECENTLY PURCHASED SHARES WILL BE DELAYED UNTIL THE
FUND OR ITS TRANSFER AGENT HAS BEEN ADVISED THAT THE PURCHASE CHECK HAS BEEN
HONORED, WHICH MAY TAKE UP TO 10 CALENDAR DAYS FROM THE TIME OF RECEIPT OF THE
PURCHASE CHECK BY THE TRANSFER AGENT. SUCH DELAY MAY BE AVOIDED BY PURCHASING
SHARES BY WIRE OR BY CERTIFIED OR CASHIER'S CHECK.
    
 
   
  REDEMPTION IN KIND. If the Trustees determine that it would be detrimental to
the best interests of the remaining shareholders of the Fund to make payment
wholly or partly in cash, the Fund may pay the redemption price in whole or in
part by a distribution in kind of securities from the investment portfolio of
the Series of the Fund, in lieu of cash, in conformity with applicable rules of
the Commission. Securities will be readily marketable and will be valued in the
same manner as in a regular redemption. See "How the Fund Values its Shares." If
your shares are redeemed in kind, you will incur transaction costs in converting
the assets into cash. The Fund, however, has elected to be governed by Rule
18f-1 under the Investment Company Act, under which the Fund is obligated to
redeem shares solely in cash up to the lesser of $250,000 or 1% of the NAV of
the Fund during any 90-day period for any one shareholder.
    
 
   
  INVOLUNTARY REDEMPTION. In order to reduce expenses of the Fund, the Trustees
may redeem all of the shares of any shareholder, other than a shareholder which
is an IRA or other tax-deferred retirement plan, whose account has a NAV of less
than $500 due to a redemption. The Fund will give such shareholders 60 days'
prior written notice in which to purchase sufficient additional shares to avoid
such redemption. No CDSC will be imposed on any such involuntary redemption.
    
 
   
  90-DAY REPURCHASE PRIVILEGE. If you redeem your shares and have not previously
exercised the repurchase privilege, you may reinvest any portion or all of the
proceeds of such redemption in shares of the Series at the NAV next determined
after the order is received, which must be within 90 days after the date of the
redemption. Any CDSC paid in connection with such redemption will be credited
(in shares) to your account. (If less than a full repurchase is made, the credit
will be on a PRO RATA basis.) You must notify the Transfer Agent, either
directly or through the Distributor or your Dealer, at the time the repurchase
privilege is exercised to adjust your account for the CDSC you previously paid.
Thereafter, any redemptions will be subject to the CDSC applicable at the time
of the redemption. See "Contingent Deferred Sales Charges" below. Exercise of
the repurchase privilege may affect the federal tax treatment of any gain
realized upon redemption.
    
 
                                       27

  CONTINGENT DEFERRED SALES CHARGES
 
   
  Redemptions of Class B shares will be subject to a CDSC declining from 5% to
zero over a six-year period. Class C shares redeemed within 18 months of
purchase will be subject to a 1% CDSC. The CDSC will be deducted from the
redemption proceeds and reduce the amount paid to you. The CDSC will be imposed
on any redemption by you which reduces the current value of your Class B or
Class C shares to an amount which is lower than the amount of all payments by
you for shares during the preceding six years, in the case of Class B shares,
and 18 months, in the case of Class C shares. A CDSC will be applied on the
lesser of the original purchase price or the current value of the shares being
redeemed. Increases in the value of your shares or shares acquired through
reinvestment of dividends or distributions are not subject to a CDSC. The amount
of any CDSC will be paid to and retained by the Distributor. See "How the Fund
is Managed--Distributor" and "Waiver of Contingent Deferred Sales Charges--Class
B Shares" below.
    
 
  The amount of the CDSC, if any, will vary depending on the number of years
from the time of payment for the purchase of shares until the time of redemption
of such shares. Solely for purposes of determining the number of years from the
time of any payment for the purchase of shares, all payments during a month will
be aggregated and deemed to have been made on the last day of the month. The
CDSC will be calculated from the first day of the month after the initial
purchase, excluding the time shares were held in a money market fund. See "How
to Exchange Your Shares" below.
 
  The following table sets forth the rates of the CDSC applicable to redemptions
of Class B shares:
 


                                               CONTINGENT DEFERRED SALES
                                                 CHARGE AS A PERCENTAGE
          YEAR SINCE PURCHASE                  OF THE DOLLARS INVESTED OR
          PAYMENT MADE                            REDEMPTION PROCEEDS
          ------------------------------     ------------------------------
                                          
          First.........................                    5.0%
          Second........................                    4.0
          Third.........................                    3.0
          Fourth........................                    2.0
          Fifth.........................                    1.0
          Sixth.........................                    1.0
          Seventh.......................                   None

 
   
  In determining whether a CDSC is applicable to a redemption, the calculation
will be made in a manner that results in the lowest possible rate. It will be
assumed that the redemption is made first of amounts representing shares
acquired pursuant to the reinvestment of dividends and distributions; then of
amounts representing the increase in NAV above the total amount of payments for
the purchase of Series shares made during the preceding six years (five years
for Class B shares purchased prior to January 22, 1990); then of amounts
representing the cost of shares held beyond the applicable CDSC period; and
finally, of amounts representing the cost of shares held for the longest period
of time within the applicable CDSC period.
    
 
  For example, assume you purchased 100 Class B shares at $10 per share for a
cost of $1,000. Subsequently, you acquired 5 additional Class B shares through
dividend reinvestment. During the second year after the purchase you decided to
redeem $500 of your investment. Assuming at the time of the redemption the NAV
had appreciated to $12 per share, the value of your Class B shares would be
$1,260 (105 shares at $12 per share). The CDSC would not be applied to the value
of the reinvested dividend shares and the amount which represents appreciation
($260). Therefore, $240 of the $500 redemption proceeds ($500 minus $260) would
be charged at a rate of 4% (the applicable rate in the second year after
purchase) for a total CDSC of $9.60.
 
  For federal income tax purposes, the amount of the CDSC will reduce the gain
or increase the loss, as the case may be, on the amount recognized on the
redemption of shares.
 
   
  WAIVER OF CONTINGENT DEFERRED SALES CHARGES--CLASS B SHARES. The CDSC will be
waived in the case of a redemption following the death or disability of a
shareholder or, in the case of a trust account, following the death or
disability of the grantor.
    
 
                                       28

The waiver is available for total or partial redemptions of shares owned by a
person, either individually or in joint tenancy (with rights of survivorship),
at the time of death or initial determination of disability, provided that the
shares were purchased prior to death or disability. In addition, the CDSC will
be waived on redemptions of shares held by a Trustee of the Fund.
 
   
  SYSTEMATIC WITHDRAWAL PLAN. The CDSC will be waived (or reduced) on certain
redemptions from a Systematic Withdrawal Plan. On an annual basis, up to 12% of
the total dollar amount subject to the CDSC may be redeemed without charge. The
Transfer Agent will calculate the total amount available for this waiver
annually on the anniversary date of your purchase or, for shares purchased prior
to March 1, 1997, on March 1 of the current year. The CDSC will be waived (or
reduced) on redemptions until this threshold 12% amount is reached.
    
 
   
  You must notify the Transfer Agent either directly or through your Dealer, at
the time of redemption, that you are entitled to waiver of the CDSC and provide
the Transfer Agent with such supporting documentation as it may deem
appropriate. The waiver will be granted subject to confirmation of your
entitlement. See "Purchase and Redemption of Fund Shares--Waiver of the
Contingent Deferred Sales Charge--Class B Shares" in the Statement of Additional
Information.
    
 
  A quantity discount may apply to redemptions of Class B shares purchased prior
to August 1, 1994. See "Purchase and Redemption of Fund Shares--Quantity
Discount--Class B Shares Purchased Prior to August 1, 1994" in the Statement of
Additional Information.
 
CONVERSION FEATURE--CLASS B SHARES
 
   
  Class B shares will automatically convert to Class A shares on a quarterly
basis approximately seven years after purchase. Conversions will be effected at
relative NAV without the imposition of any additional sales charge.
    
 
  Since the Fund tracks amounts paid rather than the number of shares bought on
each purchase of Class B shares, the number of Class B shares eligible to
convert to Class A shares (excluding shares acquired through the automatic
reinvestment of dividends and other distributions) (the Eligible Shares) will be
determined on each conversion date in accordance with the following formula: (i)
the ratio of (a) the amounts paid for Class B shares purchased at least seven
years prior to the conversion date to (b) the total amount paid for all Class B
shares purchased and then held in your account (ii) multiplied by the total
number of Class B shares purchased and then held in your account. Each time any
Eligible Shares in your account convert to Class A shares, all shares or amounts
representing Class B shares then in your account that were acquired through the
automatic reinvestment of dividends and other distributions will convert to
Class A shares.
 
   
  For purposes of determining the number of Eligible Shares, if the Class B
shares in your account on any conversion date are the result of multiple
purchases at different NAV's, the number of Eligible Shares calculated as
described above will generally be either more or less than the number of shares
actually purchased approximately seven years before such conversion date. For
example, if 100 shares were initially purchased at $10 per share (for a total of
$1,000) and a second purchase of 100 shares was subsequently made at $11 per
share (for a total of $1,100), 95.24 shares would convert approximately seven
years from the initial purchase (i.e., $1,000 divided by $2,100 (47.62%)
multiplied by 200 shares equals 95.24 shares). The Manager reserves the right to
modify the formula for determining the number of Eligible Shares in the future
as it deems appropriate on notice to shareholders.
    
 
   
  Since annual distribution-related fees are lower for Class A shares than Class
B shares, the NAV of the Class A shares may be higher than that of the Class B
shares at the time of conversion. Thus, although the aggregate dollar value will
be the same, you may receive fewer Class A shares than Class B shares converted.
See "How the Fund Values its Shares."
    
 
  For purposes of calculating the applicable holding period for conversions, all
payments for Class B shares during a month will be deemed to have been made on
the last day of the month, or for Class B shares acquired through exchange or a
series of exchanges, on the last day of the month in which the original payment
for purchases of such Class B shares was made. For Class B shares previously
exchanged for shares of a money market fund, the time period during which such
shares were held in the money market fund will be excluded. For example, Class B
shares held in a money market fund for one year will not convert to
 
                                       29

Class A shares until approximately eight years from purchase. For purposes of
measuring the time period during which shares are held in a money market fund,
exchanges will be deemed to have been made on the last day of the month. Class B
shares acquired through exchange will convert to Class A shares after expiration
of the conversion period applicable to the original purchase of such shares.
 
   
  The conversion feature may be subject to the continuing availability of
opinions of counsel or rulings of the Internal Revenue Service (i) that the
dividends and other distributions paid on Class A, Class B and Class C shares
will not constitute preferential dividends under the Internal Revenue Code and
(ii) that the conversion of shares does not constitute a taxable event. The
conversion of Class B shares into Class A shares may be suspended if such
opinions or rulings are no longer available. If conversions are suspended, Class
B shares of the Series will continue to be subject, possibly indefinitely, to
their higher annual distribution and service fee.
    
 
HOW TO EXCHANGE YOUR SHARES
 
   
  AS A SHAREHOLDER OF THE SERIES, YOU HAVE AN EXCHANGE PRIVILEGE WITH THE OTHER
SERIES OF THE FUND AND CERTAIN OTHER PRUDENTIAL MUTUAL FUNDS, INCLUDING ONE OR
MORE SPECIFIED MONEY MARKET FUNDS, SUBJECT TO THE MINIMUM INVESTMENT
REQUIREMENTS OF SUCH FUNDS. CLASS A, CLASS B AND CLASS C SHARES OF THE SERIES
MAY BE EXCHANGED FOR CLASS A, CLASS B AND CLASS C SHARES, RESPECTIVELY, OF THE
OTHER SERIES OF THE FUND OR ANOTHER FUND ON THE BASIS OF THE RELATIVE NAV. No
sales charge will be imposed at the time of exchange. Any applicable CDSC
payable upon the redemption of shares exchanged will be calculated from the
first day of the month after the initial purchase, excluding the time shares
were held in a money market fund. Class B and Class C shares may not be
exchanged into money market funds other than Prudential Special Money Market
Fund, Inc. For purposes of calculating the holding period applicable to the
Class B conversion feature, the time period during which Class B shares were
held in a money market fund will be excluded. See "Conversion Feature--Class B
Shares" above. An exchange will be treated as a redemption and purchase for tax
purposes. See "Shareholder Investment Account--Exchange Privilege" in the
Statement of Additional Information.
    
 
   
  IN ORDER TO EXCHANGE SHARES BY TELEPHONE, YOU MUST AUTHORIZE TELEPHONE
EXCHANGES ON YOUR INITIAL APPLICATION FORM OR BY WRITTEN NOTICE TO THE TRANSFER
AGENT AND HOLD SHARES IN NON-CERTIFICATE FORM. Thereafter, you may call the Fund
at (800) 225-1852 to execute a telephone exchange of shares, weekdays, except
holidays, between the hours of 8:00 A.M. and 6:00 P.M., New York time. For your
protection and to prevent fraudulent exchanges, your telephone call will be
recorded and you will be asked to provide your personal identification number. A
written confirmation of the exchange transaction will be sent to you. NEITHER
THE FUND NOR ITS AGENTS WILL BE LIABLE FOR ANY LOSS, LIABILITY OR COST WHICH
RESULTS FROM ACTING UPON INSTRUCTIONS REASONABLY BELIEVED TO BE GENUINE UNDER
THE FOREGOING PROCEDURES. All exchanges will be made on the basis of the
relative NAV of the two funds (or series) next determined after the request is
received in good order.
    
 
  IF YOU HOLD SHARES THROUGH PRUDENTIAL SECURITIES, YOU MUST EXCHANGE YOUR
SHARES BY CONTACTING YOUR PRUDENTIAL SECURITIES FINANCIAL ADVISER.
 
  IF YOU HOLD CERTIFICATES, THE CERTIFICATES, SIGNED IN THE NAME(S) SHOWN ON THE
FACE OF THE CERTIFICATES, MUST BE RETURNED IN ORDER FOR THE SHARES TO BE
EXCHANGED. SEE "HOW TO SELL YOUR SHARES" ABOVE.
 
  You may also exchange shares by mail by writing to Prudential Mutual Fund
Services LLC, Attention: Exchange Processing, P. O. Box 15010, New Brunswick,
New Jersey 08906-5010.
 
   
  IN PERIODS OF SEVERE MARKET OR ECONOMIC CONDITIONS, THE TELEPHONE EXCHANGE OF
SHARES MAY BE DIFFICULT TO IMPLEMENT AND YOU SHOULD MAKE EXCHANGES BY MAIL BY
WRITING TO PRUDENTIAL MUTUAL FUND SERVICES LLC AT THE ADDRESS NOTED ABOVE.
    
 
  SPECIAL EXCHANGE PRIVILEGE. A special exchange privilege is available for
shareholders who qualify to purchase Class A shares at NAV (see "Alternative
Purchase Plan--Class A Shares--Reduction and Waiver of Initial Sales Charges"
above). Under this exchange privilege, amounts representing any Class B and
Class C shares (which are not subject to a CDSC) held in such a
 
                                       30

   
shareholder's account will be automatically exchanged for Class A shares on a
quarterly basis, unless the shareholder elects otherwise. Eligibility for this
exchange privilege will be calculated on the business day prior to the date of
the exchange. Amounts representing Class B or Class C shares which are not
subject to a CDSC include the following: (1) amounts representing Class B or
Class C shares acquired pursuant to the automatic reinvestment of dividends and
distributions, (2) amounts representing the increase in the NAV above the total
amount of payments for the purchase of Class B or Class C shares and (3) amounts
representing Class B or Class C shares held beyond the applicable CDSC period.
Class B and Class C shareholders must notify the Transfer Agent either directly
or through their Dealer or the Distributor that they are eligible for this
special exchange privilege.
    
 
   
  The exchange privilege is not a right and may be suspended, terminated or
modified on 60 days' notice to shareholders.
    
 
   
  FREQUENT TRADING. The Fund and the other Prudential Mutual Funds are not
intended to serve as vehicles for frequent trading in response to short-term
fluctuations in the market. Due to the disruptive effect that market timing
investment strategies and excessive trading can have on efficient portfolio
management, each Prudential Mutual Fund, including the Fund, reserves the right
to refuse purchase orders and exchanges by any person, group or commonly
controlled accounts, if, in the Manager's sole judgment, such person, group or
accounts were following a market timing strategy or were otherwise engaging in
excessive trading (Market Timers).
    
 
  To implement this authority to protect the Fund and its shareholders from
excessive trading, the Fund will reject all exchanges and purchases from a
Market Timer unless the Market Timer has entered into a written agreement with
the Fund or its affiliates pursuant to which the Market Timer has agreed to
abide by certain procedures, which include a daily dollar limit on trading. The
Fund may notify the Market Timer of rejection of an exchange or purchase order
subsequent to the day on which the order was placed.
 
SHAREHOLDER SERVICES
 
   
  In addition to the exchange privilege, as a shareholder in the Series, you can
take advantage of the following services and privileges:
    
 
   
  - AUTOMATIC REINVESTMENT OF DIVIDENDS AND/OR DISTRIBUTIONS WITHOUT A SALES
CHARGE. For your convenience, all dividends and distributions are automatically
reinvested in full and fractional shares of the Series at NAV without a sales
charge. You may direct the Transfer Agent in writing not less than 5 full
business days prior to the record date to have subsequent dividends and/or
distributions sent in cash rather than reinvested. If you hold shares through
your Dealer, you should contact your Dealer.
    
 
   
  - AUTOMATIC INVESTMENT PLAN (AIP). Under AIP you may make regular purchases of
the Series' shares in amounts as little as $50 via an automatic debit to a bank
account or brokerage account (including a Command Account). For additional
information about this service, you may contact the Distributor, your Dealer or
the Transfer Agent directly.
    
 
  - SYSTEMATIC WITHDRAWAL PLAN. A systematic withdrawal plan is available to
shareholders which provides for monthly or quarterly checks. Withdrawals of
Class B and Class C shares may be subject to a CDSC. See "How to Sell Your
Shares-- Contingent Deferred Sales Charges" above.
 
   
  - THE PRUTECTOR PROGRAM-OPTIONAL GROUP TERM LIFE INSURANCE. Prudential makes
available optional group term life insurance coverage to purchasers of shares of
certain Prudential Mutual Funds which are held in an eligible brokerage account.
This insurance protects the value of your mutual fund investment for your
beneficiaries against market downturns. The insurance benefit is based on the
difference at the time of the insured's death between the protected value and
the then current market value of the shares. This coverage is not available in
all states and is subject to various restrictions and limitations. For more
complete information about this program, including charges and expenses, please
contact your Prudential representative.
    
 
  - REPORTS TO SHAREHOLDERS. The Fund will send you annual and semi-annual
reports. The financial statements appearing in annual reports are audited by
independent accountants. In order to reduce duplicate mailing and printing
expenses, the Fund will
 
                                       31

provide one annual and semi-annual shareholder report and annual prospectus per
household. You may request additional copies of such reports by calling (800)
225-1852 or by writing to the Fund at Gateway Center Three, 100 Mulberry Street,
Newark, New Jersey 07102-4077. In addition, monthly unaudited financial data is
available upon request from the Fund.
 
   
  - SHAREHOLDER INQUIRIES. Inquiries should be addressed to the Fund at Gateway
Center Three, 100 Mulberry Street, Newark, New Jersey 07102-4077, or by
telephone, at (800) 225-1852 (toll-free) or, from outside the U.S.A., at (732)
417-7555 (collect).
    
 
  For additional information regarding the services and privileges described
above, see "Shareholder Investment Account" in the Statement of Additional
Information.
 
                                       32

                        DESCRIPTION OF SECURITY RATINGS
 
MOODY'S INVESTORS SERVICE
 
BOND RATINGS
 
  Aaa:  Bonds which are rated Aaa are judged to be of the best quality. They
carry the smallest degree of investment risk and are generally referred to as
"gilt edged." Interest payments are protected by a large or by an exceptionally
stable margin and principal is secure. While the various protective elements are
likely to change, such changes as can be visualized are most unlikely to impair
the fundamentally strong position of such issues.
 
   
  Aa:  Bonds which are rated Aa are judged to be of high quality by all
standards. Together with the Aaa group, they comprise what are generally known
as high-grade bonds. They are rated lower than the best bonds because margins of
protection may not be as large as in Aaa securities or fluctuation of protective
elements may be of greater amplitude or there may be other elements present
which make the long-term risks appear somewhat larger than the Aaa securities.
    
 
  A:  Bonds which are rated A possess many favorable investment attributes and
are to be considered as upper-medium-grade obligations. Factors giving security
to principal and interest are considered adequate but elements may be present
which suggest a susceptibility to impairment sometime in the future.
 
   
  Baa:  Bonds which are rated Baa are considered as medium grade obligations,
(I.E., they are neither highly protected nor poorly secured). Interest payments
and principal security appear adequate for the present, but certain protective
elements may be lacking or may be characteristically unreliable over any great
length of time. Such bonds lack outstanding investment characteristics and in
fact have speculative characteristics as well.
    
 
  Ba:  Bonds which are rated Ba are judged to have speculative elements; their
future cannot be considered as well assured. Often the protection of interest
and principal payments may be very moderate, and thereby not well safeguarded
during both good and bad times over the future. Uncertainty of position
characterizes bonds in this class.
 
   
  B:  Bonds which are rated B generally lack characteristics of the desirable
investment. Assurance of interest and principal payments or of maintenance of
other terms of the contract over any long period of time may be small.
    
 
  Caa:  Bonds which are rated Caa are of poor standing. Such issues may be in
default or there may be present elements of danger with respect to principal or
interest.
 
  Ca:  Bonds which are rated Ca represent obligations which are speculative in a
high degree. Such issues are often in default or have other marked shortcomings.
 
  C:  Bonds which are rated C are the lowest-rated class of bonds, and issues so
rated can be regarded as having extremely poor prospects of ever attaining any
real investment standing.
 
SHORT-TERM RATINGS
 
  Moody's ratings for tax-exempt notes and other short-term loans are designated
Moody's Investment Grade (MIG). This distinction is in recognition of the
differences between short-term and long-term credit risk.
 
  MIG 1:  Loans bearing the designation MIG 1 are of the best quality, enjoying
strong protection by established cash flows, superior liquidity support or
demonstrated broad-based access to the market for refinancing.
 
  MIG 2:  Loans bearing the designation MIG 2 are of high quality, with margins
of protection ample although not so large as in the preceding group.
 
                                      A-1

  MIG 3:  Loans bearing the designation MIG 3 are of favorable quality, with all
security elements accounted for but lacking the strength of the preceding
grades.
 
  MIG 4:  Loans bearing the designation MIG 4 are of adequate quality.
Protection commonly regarded and required of an investment security is present
and although not distinctly or predominantly speculative, there is specific
risk.
 
   
  SG:  This designation denotes speculative quality. Debt instruments in this
category lack margins of protection.
    
 
   
SHORT-TERM DEBT RATINGS
    
 
   
  Moody's short-term debt ratings are opinions of the ability of issuers to
repay punctually senior debt obligations. These obligations have an original
maturity not exceeding one year, unless explicitly noted.
    
 
   
  PRIME-1: Issuers rated "Prime-1" (or supporting institutions) have a superior
ability for repayment of senior short-term debt obligations. Prime-1 repayment
ability will often be evidenced by many of the following characteristics:
    
 
   
  - Leading market positions in well-established industries.
    
 
   
  - High rates of return on funds employed.
    
 
   
  - Conservative capitalization structure with moderate reliance on debt and
  ample asset protection.
    
 
   
  - Broad margins in earnings coverage of fixed financial charges and high
  internal cash generation.
    
 
   
  - Well-established access to a range of financial markets and assured
  sources of alternate liquidity.
    
 
   
  PRIME-2: Issuers rated "Prime-2" (or supporting institutions) have a strong
ability for repayment of senior short-term debt obligations. This normally will
be evidenced by many of the characteristics cited above but to a lesser degree.
Earnings trends and coverage ratios, while sound, may be more subject to
variation. Capitalization characteristics, while still appropriate, may be more
affected by external conditions. Ample alternate liquidity is maintained.
    
 
  PRIME-3:  Issuers rated Prime-3 (or supporting institutions) have an
acceptable ability for repayment of senior short-term debt obligations.
 
  NOT PRIME:  Issuers rated Not Prime do not fall within any of the Prime rating
categories.
 
   
STANDARD & POOR'S RATINGS GROUP
    
 
   
DEBT RATINGS
    
 
   
  AAA: An obligation rated AAA has the highest rating assigned by S&P. The
obligor's capacity to meet its financial commitment on the obligation is
extremely strong.
    
 
   
  AA: An obligation rated AA differs from the highest rated obligations only in
small degree. The obligor's capacity to meet its financial commitment on the
obligation is very strong.
    
 
   
  A: An obligation rated A is somewhat more susceptible to the adverse effects
of changes in circumstances and economic conditions than obligations in
higher-rated categories. However, the obligor's capacity to meet its financial
commitment on the obligation is still strong.
    
 
   
  BBB: An obligation rated BBB exhibits adequate protection parameters. However,
adverse economic conditions or changing circumstances are more likely to lead to
a weakened capacity of the obligor to meet its financial commitment on the
obligation.
    
 
   
  BB, B, CCC, CC AND C: Obligations rated BB, B, CCC, CC and C are regarded as
having significant speculative characteristics. BB indicates the least degree of
speculation and C the highest. While such obligations will likely have some
quality and protective characteristics, these may be outweighed by large
uncertainties or major exposures to adverse conditions.
    
 
                                      A-2

  D:  Debt rated D is in payment default. This rating is used when interest
payments or principal payments are not made on the date due even if the
applicable grace period has not expired, unless S&P believes that such payments
will be made during such grace period.
 
COMMERCIAL PAPER RATINGS
 
  An S&P Commercial Paper rating is a current assessment of the likelihood of
timely payment of debt considered short-term in the relevant market.
 
   
  A-1:  This designation indicates that the degree of safety regarding timely
payment is strong. Those issues determined to possess extremely strong safety
characteristics are denoted with a plus sign (+) designation.
    
 
   
  A-2:  Capacity for timely payment on issues with this designation is
satisfactory. However, the relative degree of safety is not as high as for
issues designated A-1.
    
 
  A-3:  Issues carrying this designation have adequate capacity for timely
payment. They are, however, more vulnerable to the adverse effects of changes in
circumstances than obligations carrying the higher designations.
 
MUNICIPAL NOTES
 
  A municipal note rating reflects the liquidity concerns and market access
risks unique to municipal notes. Municipal notes due in three years or less will
likely receive a municipal note rating, while notes maturing beyond three years
will most likely receive a long-term debt rating. Municipal notes are rated
SP-1, SP-2 or SP-3. The designation SP-1 indicates a very strong capacity to pay
principal and interest. Those issues determined to possess extremely strong
safety characteristics are denoted with a plus sign (+) designation. An SP-2
designation indicates a satisfactory capacity to pay principal and interest. An
SP-3 designation indicates speculative capacity to pay principal and interest.
 
                                      A-3

                       THE PRUDENTIAL MUTUAL FUND FAMILY
 
   
  Prudential offers a broad range of mutual funds designed to meet your
individual needs. We welcome you to review the investment options available
through our family of funds. For more information on the Prudential Mutual
Funds, including charges and expenses, contact your Prudential Securities
financial adviser or Prusec representative or telephone the Funds at (800)
225-1852 for a free prospectus. Read the prospectus carefully before you invest
or send money.
    
 
      TAXABLE BOND FUNDS
    --------------------------
   
Prudential Diversified Bond Fund, Inc.
Prudential Government Income Fund, Inc.
Prudential Government Securities Trust
    Short-Intermediate Term Series
Prudential High Yield Fund, Inc.
Prudential High Yield Total Return Fund, Inc.
Prudential Mortgage Income Fund, Inc.
Prudential Structured Maturity Fund, Inc.
    Income Portfolio
    
 
      TAX-EXEMPT BOND FUNDS
    -----------------------------
   
Prudential California Municipal Fund
    California Series
    California Income Series
Prudential Municipal Bond Fund
    High Income Series
    Insured Series
    Intermediate Series
Prudential Municipal Series Fund
    Florida Series
    Maryland Series
    Massachusetts Series
    Michigan Series
    New Jersey Series
    New York Series
    North Carolina Series
    Ohio Series
    Pennsylvania Series
Prudential National Municipals Fund, Inc.
    
 
      GLOBAL FUNDS
    --------------------
   
Prudential Developing Markets Fund
    Prudential Developing Markets Equity Fund
    Prudential Latin America Equity Fund
Prudential Europe Growth Fund, Inc.
Prudential Global Genesis Fund, Inc.
Prudential Global Limited Maturity Fund, Inc.
    Limited Maturity Portfolio
Prudential Intermediate Global Income Fund, Inc.
Prudential International Bond Fund, Inc.
Prudential Natural Resources Fund, Inc.
Prudential Pacific Growth Fund, Inc.
Prudential World Fund, Inc.
    Global Series
    International Stock Series
Global Utility Fund, Inc.
The Global Total Return Fund, Inc.
    
 
      EQUITY FUNDS
    --------------------
   
Prudential Balanced Fund
Prudential Distressed Securities Fund, Inc.
Prudential Emerging Growth Fund, Inc.
Prudential Equity Fund, Inc.
Prudential Equity Income Fund
Prudential Index Series Fund
    Prudential Bond Market Index Fund
    Prudential Europe Index Fund
    Prudential Pacific Index Fund
    Prudential Small-Cap Index Fund
    Prudential Stock Index Fund
The Prudential Investment Portfolios, Inc.
    Prudential Active Balanced Fund
    Prudential Jennison Growth Fund
    Prudential Jennison Growth & Income Fund
Prudential Mid-Cap Value Fund
Prudential Real Estate Securities Fund
Prudential Small-Cap Quantum Fund, Inc.
Prudential Small Company Value Fund, Inc.
Prudential Utility Fund, Inc.
Prudential 20/20 Focus Fund
Nicholas-Applegate Fund, Inc.
    Nicholas-Applegate Growth Equity Fund
    
 
      MONEY MARKET FUNDS
    --------------------------
   
- - TAXABLE MONEY MARKET FUNDS
Cash Accumulation Trust
    Liquid Assets Fund
    National Money Market Fund
Prudential Government Securities Trust
    Money Market Series
    U.S. Treasury Money Market Series
Prudential Special Money Market Fund, Inc.
    Money Market Series
Prudential MoneyMart Assets, Inc.
- - TAX-FREE MONEY MARKET FUNDS
Prudential Tax-Free Money Fund, Inc.
Prudential California Municipal Fund
    California Money Market Series
Prudential Municipal Series Fund
    Connecticut Money Market Series
    Massachusetts Money Market Series
    New Jersey Money Market Series
    New York Money Market Series
- - COMMAND FUNDS
Command Money Fund
Command Government Fund
Command Tax-Free Fund
- - INSTITUTIONAL MONEY MARKET FUNDS
Prudential Institutional Liquidity Portfolio, Inc.
    Institutional Money Market Series
    
 
                                      B-1

   
No Dealer, sales representative or any other person has been authorized to give
any information or to make any representations, other than those contained in
this Prospectus, in connection with the offer contained herein, and, if given or
made, such other information or representations must not be relied upon as
having been authorized by the Fund or the Distributor. This Prospectus does not
constitute an offer by the Fund or by the Distributor to sell or a solicitation
of any offer to buy any of the securities offered hereby in any jurisdiction to
any person to whom it is unlawful to make such offer in such jurisdiction.
    
 
- -------------------------------------------
 
                               TABLE OF CONTENTS
 
   


                                                                              PAGE
                                                                              ----
                                                                           
FUND HIGHLIGHTS.............................................................    2
  What are the Series' Risk Factors and Special Characteristics?............    2
FUND EXPENSES...............................................................    4
FINANCIAL HIGHLIGHTS........................................................    5
HOW THE FUND INVESTS........................................................    8
  Investment Objective and Policies.........................................    8
  Other Investments and Policies............................................   13
  Investment Restrictions...................................................   14
HOW THE FUND IS MANAGED.....................................................   14
  Manager...................................................................   14
  Fee Waivers and Subsidy...................................................   15
  Distributor...............................................................   15
  Portfolio Transactions....................................................   17
  Custodian and Transfer and Dividend Disbursing Agent......................   17
  Year 2000.................................................................   17
HOW THE FUND VALUES ITS SHARES..............................................   17
HOW THE FUND CALCULATES PERFORMANCE.........................................   18
TAXES, DIVIDENDS AND DISTRIBUTIONS..........................................   18
GENERAL INFORMATION.........................................................   21
  Description of Shares.....................................................   21
  Additional Information....................................................   21
SHAREHOLDER GUIDE...........................................................   22
  How to Buy Shares of the Fund.............................................   22
  Alternative Purchase Plan.................................................   23
  How to Sell Your Shares...................................................   26
  Conversion Feature--Class B Shares........................................   29
  How to Exchange Your Shares...............................................   30
  Shareholder Services......................................................   31
DESCRIPTION OF SECURITY RATINGS.............................................  A-1
THE PRUDENTIAL MUTUAL FUND FAMILY...........................................  B-1

    
 
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MF120A
    
 
                                       Class A:    74435M-67-1
                        CUSIP Nos.:    Class B:    74435M-68-9
                                       Class C:    74435M-55-6
 
PRUDENTIAL
MUNICIPAL
SERIES FUND
- -----------
 
MICHIGAN SERIES
 
   
                         PROSPECTUS
 November 2, 1998
www.prudential.com
    
 
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