CERTIFICATE OF DESIGNATION
        SETTING FORTH THE PREFERENCES, RIGHTS
  AND LIMITATIONS OF SERIES D 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 D 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 D 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 be entitled to receive,
     when and as declared by the Board of Directors out of funds
     legally available for the purpose, dividends at the rate of
     $2.50 per share per annum, payable at the option of the
     Company, either in cash or shares of Common Stock (valued
     at the average of the Per Share Market Value for the ten
     Trading Days preceding the record date for determination of
     Holders entitled to receive such dividend).  The Company
     shall give the Holders at least 30 days prior notice in the
     event it elects to pay a dividend in shares of Common
     Stock.  Dividends on shares of this Series will accumulate
     and be payable annually on June 30 of each year, commencing
     June 30, 1997.   Dividends on shares of this Series will be
     cumulative whether or not earned or declared and whether or
     not there shall be funds of the Company legally available
     for the payment of such dividends.  Accruals and
     accumulations of dividends shall not bear interest. 
     Notwithstanding the foregoing, no dividends shall be
     payable in respect of shares of this Series which are
     converted prior to the June 30 payment date for the
     respective year.

               (b)  So long as any shares of this Series are
     outstanding, 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).  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 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 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 89% of 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 Sales 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 Sales 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 reclassification, 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 shall authorize or declare
     the taking of any event set forth in Section 6(c)(ii) or
     (iv) 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 business
     days after the date of the notice given by such Holders. 
     
               (j)  If Company intends to initiate a public
     offering of its securities during the Conversion Term, in
     an amount exceeding $12 million in the aggregate (excluding
     any shares sold by selling shareholders or pursuant to the
     exercise of an overallotment option) 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:

               "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 second anniversary of the date of such
     issuance, or such later date as the Company and the Holder
     may agree in writing
 
               "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 10 Trading Days
     immediately preceding the date of the related Conversion
     Notice (or Record Date for distributions) and the 10
     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 Sales Price during each day of the relevant
     Pricing Period.

               "Sales 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 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 closing
     bid price on such day.

               "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 26th day of June, 1996.


                                   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