CERTIFICATE OF DESIGNATION
      SETTING FORTH THE PREFERENCES, RIGHTS
AND LIMITATIONS OF SERIES C CONVERTIBLE PREFERRED
           STOCK OF IMMUNOMEDICS, INC.


          IMMUNOMEDICS, INC. , a Delaware corporation
(the "Company") certifies that pursuant to the authority contained
in Article IV of its Certificate of Incorporation, and in accordance
with the provisions of Section 151 of the General Corporation Law
of the State of Delaware, its Board of Directors has adopted the
following resolution creating a series of its preferred stock to be
designated Series C Convertible Preferred Stock:

          RESOLVED, that a series of the class of authorized
preferred stock of the Company be hereby created, and that the
designation and amount thereof and the voting powers,
preferences and relative, participating, optional and other special
rights of the shares of such series, and the qualifications, limitations
and restrictions thereof are as follows:

          Section 1. Designation, Amount, Ranking and Par
     Value. The designation of the series of Preferred Stock shall
     be "Series C Convertible Preferred Stock" (this "Series") and
     the number of shares constituting this Series shall be
     200,000.  The par value of each share of this Series shall be
     $0.01. Shares of this Series shall have a stated value of $50
     per share (the "Stated Value"). The shares of this Series shall
     rank prior to the Junior Stock (as defined below) as to
     distribution of assets (upon liquidation or otherwise) and
     payment of dividends.

          Section 2. Dividends.

               (a) The Holders shall not be entitled to receive
     dividends unless a dividend is declared on any Junior Stock.

               (b)  No dividend or distribution in cash or
     other property on the Junior Stock (other than a dividend or
     distribution described in Section 6) shall be declared or paid
     or set apart for payment unless, at the same time, the same
     dividend or distribution is declared or paid or set apart, as
     the case may be, on each share of this Series in the amount
     equal to the product of (i) the declared dividend on the
     Junior Stock and (ii) the Conversion Ratio (defined below) in
     effect on the Record Date (as defined below).

               (c) Any record date (the "Record Date") and
     the payment date for this Series shall be the same as the
     respective record date and payment date for dividends or
          distributions on any Junior Stock.
     
          Section 3. Redemption. Prior to the expiration of the
     Conversion Term (as defined below), the shares of this
     Series shall not be redeemable at the option of the
     Company, except by agreement between the Company and
     the Holder.  After expiration of the Conversion Term, the
     Company may redeem any shares of this Series at a price
     equal to the Stated Value.

          Section 4. Voting Rights. The holders shall not be
     entitled to vote on matters submitted to the vote of the
     holders of Common Stock. However, so long as any shares
     of this Series are outstanding, the Company shall not,
     without the affirmative vote of the Holders of two-thirds of
     the outstanding shares of this Series, (i) alter or change the
     powers, preferences or rights given to this Series adversely
     or (ii) authorize or create any series or class of capital stock
     or issue any shares of capital stock ranking as to dividends
     or distribution of assets (upon liquidation or otherwise) prior
     to or pari passu with this Series.

          Section 5. Liquidation. In the event of any complete
     liquidation, dissolution or winding-up of the Company,
     whether voluntary or involuntary, the Holders shall be
     entitled to receive out of the assets of the Company,
     whether such assets are capital or surplus, for each share of
     this Series an amount equal to $50.00 per share before any
     distribution shall be made to the holders of Junior Stock of
     the Company, and if the assets of the Company shall be
     insufficient to pay in full such amounts, then such assets
     shall be distributed among such Holders ratably in
     accordance with the respective amounts that would be
     payable on such shares if all amounts payable thereon were
     paid in full.

          Section 6. Conversion.

               (a)  Each share of this Series shall be
     convertible into shares of Common Stock at the Conversion
     Ratio, at the option of the Holder in whole or in part at any
     time prior to the expiration of the Conversion Term.  The
     Company shall give to each Holder 30 days prior written
     notice of the expiration of the Conversion Term.  The
     Holders shall effect conversions by delivering to the
     Company a written notice substantially in the form of
     conversion notice set forth on the reverse of the certificate
     evidencing shares of this Series (the "Conversion Notice"),
     which Conversion Notice, once given, shall be irrevocable.

               (b)  No later than five (5) Trading Days
     following the last day of the applicable Pricing Period, each
     Holder, who is converting shares, shall deliver to the
     Company the certificate or certificates representing the
     shares of the Series to be converted and within five (5)
     Trading days thereafter the Company will deliver to such
     Holder (i) a certificate or certificates which shall be free of
     restrictive legends and "stop transfer" restrictions
     representing the number of shares of Common Stock being
     acquired upon the conversion of shares of this Series and (ii)
     if the Holder is converting less than all shares of this Series,
     a certificate for such number of shares of this Series as have
     not been converted.

               (c)(i)  The Conversion Price (the "Conversion
     Price") in effect on any Conversion Date or Record Date
     shall equal 90 1/4% of the Pricing Period Average Price;
     provided, however, that if the Average Price during the last
     fifteen (15) Trading Days of a relevant Pricing Period
     
     exceeds the Average Price during the first fifteen (15)
     Trading Days of such Pricing Period by at least 30% but less
     than 40%, then the Conversion Price shall equal 95 1/2% of
     the Pricing Period Average Price; and provided, further, that
     if the Average Price during the last fifteen (15) Trading Days
     of a Pricing Period exceeds the Average Price during the
     first fifteen (15) Trading Days of such Pricing Period by at
     least 40%, then the Conversion Price shall equal the Pricing
     Period Average Price.

                    (ii)  If the Company, during any Pricing
     Period, shall (A) pay a stock dividend or otherwise make a
     distribution or distributions on shares of its Junior Stock
     payable in shares of its capital stock (whether payable in
     shares of its Common Stock or of capital stock of any class),
     (B) subdivide outstanding shares of Common Stock into a
     larger number of shares, (C) combine outstanding shares of
     Common Stock into a smaller number of shares, (D) issue
     by reclassification of shares of Common Stock any shares of
     capital stock of the Company, (E) issue rights or warrants to
     all holders of Common Stock (but not to the Holders)
     entitling them (for a period expiring within 45 days after the
     record date mentioned below) to subscribe for or purchase
     shares  of Common Stock at a price per share less than the
     Per Share Market Value of Common Stock at the record date
     for determining holders entitled to receive such rights, (F)
     distribute to all holders of Common Stock (and not to the
     Holders) rights or warrants to subscribe for or purchase any
     security (excluding those referred to in subsection 6(c)(ii)(E)
     above), or (G) take any other action similar to the above
     which materially and adversely affects the rights of the
     Holders different than or distinguished from the effects
     generally on the rights of the holders of any other class of
     the Company's capital stock), the Company shall make an
     appropriate adjustment to the Average Price for each
     Trading Day in the Pricing Period prior to the record date or
     effective date of such event so as to continue to give to each
     Holder, the economic value of the Conversion Price
     formula set forth in Section 6(c)(i), as determined by the
     Board of Directors of the Company in good faith; provided,
     however that if the Holders of a majority in interest of the
     shares of this Series ("Majority in Interest") disagree with the
     determination of the Board of Directors, then the Holders of
     a Majority in Interest and the Company shall each in good
     faith select a national or regional investment banking firm or
     firm of independent certified public accountants of
     recognized standing (which may be the firm that regularly
     examines the financial statements of the Company) (an
     "Appraiser") who shall mutually agree on the amount, if any
     of the adjustment required by this section and provided,
     further that if the Appraisers are unable to agree, the amount
     of the adjustment be equal to the average of the
     determinations by each such Appraiser.  

                   (iii)  Whenever an adjustment is
     required pursuant to Section 6(c)(ii), the Company shall
     promptly mail to each Holder a notice setting forth the
     Average Prices after such adjustment and setting forth a
     brief statement of the facts requiring such adjustment. 

                    (iv)  In case of any reclassification of
     the Common Stock, any consolidation or merger of the
     Company with or into another person, sale or transfer of all
     or substantially all of the assets of the Company or any
     compulsory share exchange pursuant to which share
     exchange the Common Stock is converted into other
     securities, cash or property, then the Holders shall have the
     right thereafter to convert such shares only into the kind and
     amount of shares of stock and other securities and property
     receivable upon or deemed be held following such
     reclassification, consolidation, merger, sale, transfer or share
     exchange by a Holder of a number of shares of the
     Common Stock of the Company into which such shares this
     Series could have been converted immediately prior to such
     reclassification, consolidation, merger, sale, transfer or share
     exchange.  The terms of any such consolidation, merger,
     sale, transfer or share exchange shall include such terms so
     as to continue to give to each Holder, the economic value
     of the Conversion Price formula set forth in Section 6(c)(i)
     following such consolidation, merger, sale, transfer or share
     exchange.  This provision shall similarly apply to successive
     reclassifications, consolidation, mergers, sales, transfers or
     share exchanges. 

                    (v)  All calculations under this Section
     6 shall be made to the nearest cent or the nearest 1/l00th of
     a share, as the case may be. 

               (d)  The Company shall at all times reserve
     and keep available, out of its authorized and unissued
     Common Stock solely for the purpose of issuance upon
     conversion of this Series as herein provided, free from
     preemptive rights or any other actual or contingent purchase
     rights of Persons other than the Holders, such number of
     shares of Common Stock as shall be issuable upon the
     conversion of all outstanding shares of this Series.  All
     shares of Common Stock that shall be so issued upon
     conversion of shares of this Series shall be duly and validly
     issued and fully paid and nonassessable.
     
               (e)  The Company shall not be required to
     issue stock certificates representing fractions of shares of
     Common Stock, but may if otherwise permitted, make a
     cash payment in respect of any final fraction of a share
     based on the Per Share Market Value at such time.  If the
     Company elects not, or is unable, to make such a cash
     payment, each Holder shall be entitled to receive, in lieu of
     the final fraction of a share, one whole share of Common
     Stock.

               (f)  The issuance of certificates for shares of
     Common Stock on conversion of this Series shall be made
     without charge to the Holders for any documentary stamp
     or similar taxes that may be payable in respect of the issue
     or delivery of such certificate, provided, that the Company
     shall not be required to pay any tax that may be payable in
     respect of any transfer involved in the issuance and delivery
     of any such certificate in a name other than that of the
     Holder converted and the Company shall not be required to
     
     issue or deliver such certificates unless or until the person
     or persons requesting the issuance thereof shall have paid to
     the Company the amount of such tax or shall have
     established to the satisfaction of the Company that such tax
     has been paid.

               (g)  The Company shall have no right to
     require any Holder to convert any or all of this Series into
     Common Stock.

               (h)  Shares of this Series converted into
     Common Stock shall be canceled and shall have the status
     of authorized but unissued shares of Preferred Stock but
     may not be reissued as shares of this Series.
     
               (i)  If the Company should make an
     authorization or declaration of any event pursuant to this
     Section 6 during a Pricing Period, the Holders of a Majority
     in Interest may in their sole discretion, elect by written
     notice to the Company to reduce the term of the Pricing
     Period to the Trading Day immediately preceding the date
     of such authorization or declaration and to accelerate the
     delivery of the shares to a date which is five (5) business
     days after the date of the notice given by such Holders. 
     
               (k)  If Company intends to initiate a public
     offering of its securities during the Conversion Term, in an
     amount exceeding $12 million in the aggregate and the
     Company reasonably believes that the conversion of any
     shares of this Series may have an adverse effect on the
     ability of the Company to complete such offering or the
     price at which such securities could be sold therein, the
     Company, upon at least 30 days' prior written notice to all
     Holders, may suspend the right of all Holders to convert
     such shares pursuant to Section 6 for the period
     commencing on the date the Company files with the
     Securities and Exchange Commission a registration
     statement under the Securities Act of 1933 and terminating
     30 days after the closing of the public offering relating
     thereto; provided, however, that such period shall not
     exceed four months and provided, further, that the last day
     of the Conversion Term shall be extended for 120% of such
     number of days as the conversion right was suspended.

          Section 7.  Definitions.  For the purposes hereof, the
     following terms shall have the following meanings:

               "Average Price" means, with respect to any
     Trading Day, (a) if the Common Stock is then listed or
     quoted on a principal stock exchange or The Nasdaq Stock
     Market, the average (rounded to the nearest thousandth of a
     dollar) of the high and low sales price on such day of the
     Pricing Period or (b) if the Common Stock is not listed or
     quoted on a principal stock exchange or The Nasdaq Stock
     Market but is quoted in the over-the-counter market, the
     average (rounded to the nearest thousandth of a dollar) of
     the average of the daily closing bid and ask price on such
     day.


               "Common Stock" means shares now or
     hereafter authorized of the class of Common Stock, $0.01
     par value, of the Company presently authorized and stock
     of any other class into which such shares may hereafter
     have been reclassified or changed.

               "Conversion Date" means the last day of the
     relevant Pricing Period.

               "Conversion Ratio" means a fraction, of which
     the numerator is Stated Value, and of which the
     denominator is the Conversion Price. 

               "Conversion Term" means the period
     commencing on the date that the shares of this Series are
     issued and ending on the date that is 180 calendar days
     after the date of initial issuance of shares of this Series, or
     such later date as the Company and the Holder may agree,
     and provided that (a) if the Average Price during the 60
     Trading Day period ending on the expiration date of such
     initial 180-day period is greater than $7.00 but less than
     $10.00 the Conversion Term shall be extended to the date
     that is 300 calendar days after the date of initial issuance of
     shares of this Series, (b) if the Average Price during the 60
     Trading Day period ending on the expiration date of such
     initial 180-day period is greater than $5.00 but less than
     $7.00, then the Conversion Term shall be extended to the
     date that is 360 calendar days after the date of the initial
     issuance of shares of this Series, and (c) if the Average Price
     during the 60 Trading Day period ending on the expiration
     date of such initial 180-day period is less than $5.00, then
     the Conversion Term shall be extended to the date that is
     600 calendar days after the date of initial issuance of shares
     of this Series.  If there occurs an event of the type listed in
     Section 6(c)(ii), the Company shall make appropriate
     adjustment to the dollar amount set forth in this paragraph.
 
               "Junior Stock" means the Common Stock of
     the Company and any other capital stock of the Company,
     except as to shares of capital stock of any series or class
     which, by its terms, is prior in right of distribution to the
     shares of this Series.

               "Holder" means a holder of record of
     outstanding shares of this Series. Any notice required or
     permitted to be given to a Holder shall be given to such
     Holder at its last address as it shall appear upon the stock
     books of the Company.

               "Per Share Market Value" means on any
     particular date (a) the last sale price per share of the
     Common Stock on such date on the principal stock
     exchange or The Nasdaq Stock Market, as the case may be,
     on which the Common Stock is then traded or, if there is no
     such price on such date, then the last price on such
     exchange on the date nearest preceding such date, or (b) if
     the Common Stock is not listed on any stock exchange or
     The Nasdaq Stock Market, the average of the bid and asked
     price for a share of Common Stock in the over-the-counter
     
     market as reported by the National Quotation Bureau
     Incorporated (or similar organization or agency succeeding
     to its functions of reporting prices), or (c) if the Common
     Stock is no longer publicly traded the fair market value of a
     share of Common Stock as determined by an Appraiser
     selected in good faith by the Holders of a Majority in
     Interest; provided, however, that if the Company, after
     receipt of the determination by such Appraiser shall have
     the right to select an additional Appraiser, in which case,
     the fair market value shall be equal to the average of the
     determinations by each such Appraiser; provided further
     that none of the transactions related to the foregoing
     determination shall include purchases by any "affiliate" (as
     such term is defined in the General Rules and Regulations
     under the Securities Act of 1933) of the Company.

               "Person" means a corporation, an association,
     a partnership, organization, a business, an individual, a
     government or political subdivision thereof or a governmental agency.

               "Pricing Period" means the fifteen (15)
     Trading Days immediately preceding the date of the related
     Conversion Notice (or Record Date for distributions) and the
     fifteen (15) Trading Days commencing on the date of the
     related Conversion Notice (or Record Date for distributions).

               "Pricing Period Average Price" means the
     average of the Average Price during each day of the relevant
     Pricing Period.

               "Trading Day" means (a) a day on which the
     Common Stock is traded on the principal stock exchange or
     The Nasdaq Stock Market, as the case may be,  as reported
     by such stock exchange or The Nasdaq Stock Market, or (b)
     if the Common Stock is not traded on a principal stock
     exchange or The Nasdaq Stock Market, a day on which the
     Common Stock is quoted in the over-the-counter market as
     reported by the National Quotation Bureau Incorporated (or
     any similar organization or agency succeeding to its
     functions of reporting prices).


          
          IN WITNESS WHEREOF, IMMUNOMEDICS, INC.
has caused this Certificate of Designation to be executed by its
Chairman of the Board and Chief Executive Officer and attested to
by its Secretary this 25th day of September, 1995.


                                   IMMUNOMEDICS, INC.


                                   By /s/ David M. Goldenberg
                                       David M. Goldenberg
                                       Chairman of the Board and
                                       Chief Executive Officer


ATTEST:


/s/ Amy Factor
Amy Factor
Secretary