COMMONWEALTH BIOVENTURES III LP
SC 13G/A, 1996-06-06
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<PAGE>   1
                                UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
 
                                  SCHEDULE 13G
 
                   UNDER THE SECURITIES EXCHANGE ACT OF 1934
                               (AMENDMENT NO. 3)*
 
                         Polymedica Industries, Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)
 
                                 Common Stock
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)
 
                                 731738-10-0
- --------------------------------------------------------------------------------
                                 (CUSIP Number)
 
Check the following box if a fee is being paid with this statement / /. (A fee
is not required only if the filing person: (1) has a previous statement on file
reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class.)
(See Rule 13d-7.)
 
*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.
 
The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).
 
 
                               Page 1 of 5 Pages
 
SEC 1745 (2-95)
<PAGE>   2
 
CUSIP NO. 731738-10-0                    13G                  PAGE 2 OF 5 PAGES
 
<TABLE>
<S>   <C>
- --------------------------------------------------------------------------------------------------------------
  1   NAME OF REPORTING PERSON
      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      Commonwealth BioVentures III Limited Partnership
      04-3083977
- --------------------------------------------------------------------------------------------------------------
  2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 
      (a)  / /       (b)  / /
- --------------------------------------------------------------------------------------------------------------
  3   SEC USE ONLY
- --------------------------------------------------------------------------------------------------------------
  4   CITIZENSHIP OR PLACE OF ORGANIZATION
 
      Delaware
- --------------------------------------------------------------------------------------------------------------
      NUMBER OF      5     SOLE VOTING POWER
       SHARES                35,000
    BENEFICIALLY     ------------------------------------------------------------------------------------------
      OWNED BY       6     SHARED VOTING POWER                                                                 
        EACH                 0                                                                                  
      REPORTING      ------------------------------------------------------------------------------------------
       PERSON        7     SOLE DISPOSITIVE POWER                                                              
        WITH                 35,000
                     ------------------------------------------------------------------------------------------
                     8     SHARED DISPOSITIVE POWER 
                             0
- ---------------------------------------------------------------------------------------------------------------
  9   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      35,000
- --------------------------------------------------------------------------------------------------------------
 10   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
- --------------------------------------------------------------------------------------------------------------
 11   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
      .46%
- --------------------------------------------------------------------------------------------------------------
 12   TYPE OF REPORTING PERSON*
      PN
- --------------------------------------------------------------------------------------------------------------
 
</TABLE>
 
                     *SEE INSTRUCTION BEFORE FILLING OUT!

                               Page 2 of 5 pages
<PAGE>   3
                                                                     Page 3 of 5
                                                                     -----------

                                  SCHEDULE 13G
                                  ------------

ITEM 1.
- ------

(a)  Name of Issuer:

     PolyMedica Industries, Inc.

(b)  Address of Issuer's Principal Executive Offices:

     11 State Street
     Woburn, MA  01801

ITEM 2.
- ------

(a)  Name of Person Filing:

     Commonwealth BioVentures III Limited Partnership

(b)  Address of Principal Business Office or, if none, Residence:

     4 Milk Street
     Portland, ME 04101

(c)  Citizenship:

     Delaware

(d)  Title of Class of Securities:

     Common

(e)  CUSIP Number:

     731738-10-0

ITEM 3. Persons filing pursuant to Rule 13d-1(b) or 13d-2(b):
- ------

     N/A


<PAGE>   4

                                                                     Page 4 of 5
                                                                     -----------
ITEM 4.  Ownership:
- ------

     (a)  Amount beneficially owned:  35,000
     (b)  Percent of Class:  .46%
     (c)  Number of shares as to which such person has:
          (i)   Sole power to vote or to direct the vote: 35,000
          (ii)  Shared power to vote or to direct the vote: 0
          (iii) Sole power to dispose or to direct the disposition of: 35,000
          (iv)  Shares power to dispose or to direct the disposition of: 0

ITEM 5.  Ownership of Five Percent or Less of a Class:
- ------

     If this statement is being filed to report the fact that as of the date
hereof the reporting person has ceased to be the beneficial owner of more than
five percent of the class of securities, check the following [X]

ITEM 6.  Ownership of More than Five Percent on Behalf of Another Person:
- ------

     N/A

ITEM 7.  Identification and Classification of the Subsidiary Which
- ------   Acquired the Security Being Reported on By the Parent Holding Company:

     N/A

ITEM 8.  Identification and Classification of Members of the Group:
- ------

     N/A

ITEM 9.  Notice of Dissolution of Group:
- ------

     N/A


<PAGE>   5

                                                                     Page 5 of 5
                                                                     -----------

ITEM 10. Certification:
- -------

     N/A

                                    SIGNATURE

     After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.

                              COMMONWEALTH BIOVENTURES III LIMITED
                               PARTNERSHIP


                              By BioVenture Partners Limited
                               Partnership, its General Partner

                              By Commonwealth BioVentures Inc., its
                               General Partner



Date:  May ___, 1996          By: _____________________________________
                                    Robert G. Foster, President


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