MEMORIAL DRIVE TRUST
SC 13G/A, 1998-02-13
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                               UNITED STATES
                     SECURITIES AND EXCHANGE COMMISSION
                          Washington, D.C. 20549

                               SCHEDULE 13G/A

                 Under the Securities Exchange Act of 1934
                          (Amendment No.   4   )(1)
                                         ------

                       ARCH COMMUNICATIONS GROUP INC.
                     ----------------------------------
                              (Name of Issuer)

                  Common Stock, $0.01 par value per share
                     ----------------------------------
                       (Title of Class of Securities)

                               039381-10-8
                     ----------------------------------
                              (CUSIP Number)

(1) 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
                                       
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CUSIP No. 039381-10-8                13G/A               Page   2  of  5  Pages
          -----------                                          ---    --- 

- -------------------------------------------------------------------------------
 (1) Names of Reporting Persons
     S.S. or I.R.S. Identification Nos. of Above Persons
     Memorial Drive Trust #04-2272266 Plan #001
- -------------------------------------------------------------------------------
 (2) Check the Appropriate Box if a Member of a Group*
     (See Instructions)
                                  (a)  / /
                                  (b)  / /
     N/A
- -------------------------------------------------------------------------------
 (3) SEC Use Only

- -------------------------------------------------------------------------------
 (4) Citizenship or Place of Organization 
     Massachusetts
- -------------------------------------------------------------------------------
Number of Shares              (5) Sole Voting Power
 Beneficially                     1,947,990
 Owned by                    --------------------------------------------------
 Each Reporting               (6) Shared Voting Power
 Person With                      0
                             --------------------------------------------------
                              (7) Sole Dispositive Power
                                  1,947,990
                             --------------------------------------------------
                              (8) Shared Dispositive Power
                                  0
- -------------------------------------------------------------------------------
 (9) Aggregate Amount Beneficially Owned by Each Reporting Person
     1,947,990
- -------------------------------------------------------------------------------
(10) Check Box if the Aggregate Amount in Row (9) Excludes Certain Shares*
     (See Instructions)                                      
     N/A                          /  /
- -------------------------------------------------------------------------------
(11) Percent of Class Represented by Amount in Row (9)
     9.4%
- -------------------------------------------------------------------------------
(12) Type of Reporting Person (See Instructions)
     EP
- -------------------------------------------------------------------------------


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CUSIP No. 039381-10-8                13G/A               Page   3  of  5  Pages
          -----------                                          ---    --- 

ITEM 1(A).  NAME OF ISSUER:
            Arch Communications Group Inc.
- -------------------------------------------------------------------------------


ITEM 1(B).  ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:
            110 Turnpike Road, Suite 210
            Westborough, MA 01581
- -------------------------------------------------------------------------------


ITEM 2(A).  NAME OF PERSON FILING:
            Memorial Drive Trust ("MDT")
- -------------------------------------------------------------------------------


ITEM 2(B).  ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE:
            125 CambridgePark Drive
            6th Floor
            Cambridge, MA 02140
- -------------------------------------------------------------------------------


ITEM 2(C).  PLACE OF ORGANIZATION:
            Massachusetts
- -------------------------------------------------------------------------------


ITEM 2(D).  TITLE OF CLASS OF SECURITIES:
            Common Stock, $0.01 par value
- -------------------------------------------------------------------------------


ITEM 2(E).  CUSIP NUMBER
            039381-10-8
- -------------------------------------------------------------------------------


<PAGE>

CUSIP No. 039381-10-8                13G/A               Page   4  of  5  Pages
          -----------                                          ---    --- 


ITEM 3.     IF THIS STATEMENT IS FILED PURSUANT TO RULES 13D-1(B), OR 13D-2(B),
            CHECK WHETHER THE PERSON FILING IS A

    (a) / / Broker or Dealer registered under Section 15 of the Act

    (b) / / Bank as defined in section 3(a)(6) of the Act

    (c) / / Insurance Company as defined in section 3(a)(19) of the Act

    (d) / / Investment Company registered under section 8 of the Investment
            Company Act

    (e) / / Investment Adviser registered under section 203 of the Investment
            Advisers Act of 1940

    (f) /X/ Employee Benefit Plan, Pension Fund which is subject to the
            provisions of the Employee Retirement Income Security Act of 1974
            or Endowment Fund; see Rule 13d-1(b)(1)(ii)(F)

    (g) / / Parent Holding Company, in accordance with Rule 13d-1(b)(ii)(G);
            see Item 7)

    (h) / / Group, in accordance with Rule 13d-1(b)(1)(ii)(H)
- -------------------------------------------------------------------------------


ITEM 4.  OWNERSHIP:

    (a) Amount Beneficially Owned:  1,947,990 shares
    ---------------------------------------------------------------------------
    (b) Percent of Class:  9.4%
    ---------------------------------------------------------------------------
    (c) Number of shares as to which such person has:

          (i) Sole power to vote or to direct the vote: 1,947,990 shares
              -----------------------------------------------------------------
         (ii) Shared power to vote or to direct the vote: None
              -----------------------------------------------------------------
        (iii) Sole power to dispose or to direct the disposition of:
              1,947,990 shares
              -----------------------------------------------------------------
         (iv) Shared power to dispose or to direct the disposition of: None
              -----------------------------------------------------------------

- -------------------------------------------------------------------------------


ITEM 5.  OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS:

         Not applicable

- -------------------------------------------------------------------------------


ITEM 6.  OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON:

         Not applicable

- -------------------------------------------------------------------------------


ITEM 7.  IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED
         THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY:

         Not applicable
- -------------------------------------------------------------------------------


ITEM 8.  IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP:

         Not applicable
- -------------------------------------------------------------------------------

<PAGE>

CUSIP No. 039381-10-8                13G/A               Page   5  of  5  Pages
          -----------                                          ---    --- 

ITEM 9.  NOTICE OF DISSOLUTION OF GROUP:

         Not applicable
- -------------------------------------------------------------------------------


ITEM 10. CERTIFICATION:

    By signing below I certify that, to the best of my knowledge and belief,
    the securities referred to above were acquired in the ordinary course of
    business and were not acquired for the purpose of and do not have the effect
    of changing or influencing the control of the issuer of such securities and
    were not acquired in connection with or as a participant in any transaction
    having such purposes or effect.


                                  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.
                                   February 12, 1998
                               ------------------------
                                       (Date)

                               MEMORIAL DRIVE TRUST


                               By: /s/ R. Schorr Berman
                                  -----------------------
                                  R. Schorr Berman
                                  Administrator and
                                  Chief Executive Officer




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