POLYCOM INC
SC 13G/A, 1999-02-16
TELEPHONE & TELEGRAPH APPARATUS
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  Schedule 13G
                                 (Rule 13d-102)

        INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES
    13d-1 (b), (c) AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2 (b)
                               (Amendment No. 1)*



                                  Polycom, Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)


                                  Common Stock
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                   73172K 10 4
- --------------------------------------------------------------------------------
                                 (CUSIP Number)


                                December 31, 1998
- --------------------------------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)

Check the  appropriate box to designate the rule pursuant to which this Schedule
is filed:

             [ ]     Rule 13d-1(b)

             [ ]     Rule 13d-(c)

             [X]     Rule 13d-1(d)

*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
disclosures provided in a prior cover page.

The information required on 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).

                         (Continued on following pages)
                               Page 1 of 13 Pages

<PAGE>

<TABLE>
<CAPTION>
- ----------------------------------------------------------                    ---------------------------------------
CUSIP NO. 73172K 10 4                                            13 G                   Page 2 of 13 Pages
- ----------------------------------------------------------                    ---------------------------------------
<S>          <C>                                                                    <C>              <C>  
- ------------ ---------------------------------------------------------------------------------------------------------
1            NAME OF REPORTING PERSONS
             SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
                      Accel III L.P. ("A3")

- ------------ ---------------------------------------------------------------------------------------------------------
2
             CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                    (a) [ ]          (b) [X]
- ------------ ---------------------------------------------------------------------------------------------------------

3            SEC USE ONLY
- ------------ ---------------------------------------------------------------------------------------------------------

4            CITIZENSHIP OR PLACE OF ORGANIZATION
                      Delaware
- ------------ ---------------------------------------------------------------------------------------------------------

             NUMBER OF               5        SOLE VOTING POWER
              SHARES                          1,158,695  shares,  except  that A3A,  the  general  partner  of A3, and
           BENEFICIALLY                       Breyer, Klingenstein,  Patterson,  Sednaoui, Swartz and SFP, the general
          OWNED BY EACH                       partners of A3A, may share voting power with respect to such shares.    
             REPORTING                                                                                                
              PERSON                          
               WITH
                                     -------- ------------------------------------------------------------------------

                                     6        SHARED VOTING POWER
                                              See response to row 5.
                                     -------- ------------------------------------------------------------------------

                                     7        SOLE DISPOSITIVE POWER
                                              1,158,695,  except  that A3A,  the  general  partner of A3, and  Breyer,
                                              Klingenstein,  Patterson, Sednaoui, Swartz and SFP, the general partners
                                              of A3A, may share dispositive power with respect to such shares.
                                     -------- ------------------------------------------------------------------------

                                     8        SHARED DISPOSITIVE POWER
                                              See response to row 7.
- ------------ ---------------------------------------------------------------------------------------------------------

9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       1,158,695
- ------------ ---------------------------------------------------------------------------------------------------------

10           CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
             EXCLUDES CERTAIN SHARES*
                                                                                                        [ ]
- ------------ ---------------------------------------------------------------------------------------------------------

11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                    3.9%
- ------------ ---------------------------------------------------------------------------------------------------------

12           TYPE OF REPORTING PERSON*                                                              PN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                                        o SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>

<TABLE>
<CAPTION>
- ----------------------------------------------------------                    ---------------------------------------
CUSIP NO. 73172K 10 4                                            13 G                   Page 3 of 13 Pages
- ----------------------------------------------------------                    ---------------------------------------
<S>          <C>                                                                    <C>              <C>  
- ------------ ---------------------------------------------------------------------------------------------------------
1            NAME OF REPORTING PERSONS
             SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
                      Accel Japan L.P. ("AJ")
- ------------ ---------------------------------------------------------------------------------------------------------

2            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                    (a) [ ]          (b) [X]
- ------------ ---------------------------------------------------------------------------------------------------------

3            SEC USE ONLY
- ------------ ---------------------------------------------------------------------------------------------------------

4            CITIZENSHIP OR PLACE OF ORGANIZATION
                      Delaware
- ------------ ---------------------------------------------------------------------------------------------------------

             NUMBER OF               5        SOLE VOTING POWER
              SHARES                          210,671 shares, except that Breyer,  Klingenstein,  Patterson,  Sednaoui
           BENEFICIALLY                       and  Swartz,  the  general  partners of AJ, may be deemed to have shared
          OWNED BY EACH                       voting power with respect to such shares.                               
             REPORTING                                                                                                
              PERSON                          
               WITH
                                     -------- ------------------------------------------------------------------------

                                     6        SHARED VOTING POWER
                                              See response to row 5.
                                     -------- ------------------------------------------------------------------------

                                     7        SOLE DISPOSITIVE POWER
                                              210,671 shares, except that Breyer,  Klingenstein,  Patterson,  Sednaoui
                                              and  Swartz,  the  general  partners of AJ, may be deemed to have shared
                                              dispositive power with respect to such shares.
                                     -------- ------------------------------------------------------------------------

                                     8        SHARED DISPOSITIVE POWER
                                              See response to row 7.
- ------------ ---------------------------------------------------------------------------------------------------------

9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       210,671
- ------------ ---------------------------------------------------------------------------------------------------------

10           CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
             EXCLUDES CERTAIN SHARES*
                                                                                                        [ ]
- ------------ ---------------------------------------------------------------------------------------------------------

11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                    0.7%
- ------------ ---------------------------------------------------------------------------------------------------------

12           TYPE OF REPORTING PERSON*
                                                                                                    PN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                                         *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>

<TABLE>
<CAPTION>
- ----------------------------------------------------------                    ---------------------------------------
CUSIP NO. 73172K 10 4                                            13 G                   Page 4 of 13 Pages
- ----------------------------------------------------------                    ---------------------------------------
<S>          <C>                                                                    <C>              <C>  
- ------------ ---------------------------------------------------------------------------------------------------------
1            NAME OF REPORTING PERSONS
             SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
                      Accel Investors '91 L.P. ("A91")

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

2            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                    (a) [ ]          (b) [X]
- ------------ ---------------------------------------------------------------------------------------------------------

3            SEC USE ONLY
- ------------ ---------------------------------------------------------------------------------------------------------

4            CITIZENSHIP OR PLACE OF ORGANIZATION
                      Delaware
- ------------ ---------------------------------------------------------------------------------------------------------

             NUMBER OF               5        SOLE VOTING POWER
              SHARES                          52,668  shares,  except that  Klingenstein,  Patterson  and Swartz,  the
           BENEFICIALLY                       general  partners of A91, may be deemed to have shared voting power with
          OWNED BY EACH                       respect to such shares.                                                 
             REPORTING                                                                                                
              PERSON                          
               WITH
                                     -------- ------------------------------------------------------------------------

                                     6        SHARED VOTING POWER
                                              See response to row 5.
                                     -------- ------------------------------------------------------------------------

                                     7        SOLE DISPOSITIVE POWER
                                              52,668  shares,  except that  Klingenstein,  Patterson  and Swartz,  the
                                              general partners of A91, may be deemed to have shared  dispositive power
                                              with respect to such shares.
                                     -------- ------------------------------------------------------------------------

                                     8        SHARED DISPOSITIVE POWER
                                              See response to row 5.
- ------------ ---------------------------------------------------------------------------------------------------------

9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       52,668
- ------------ ---------------------------------------------------------------------------------------------------------

10           CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
             EXCLUDES CERTAIN SHARES*
                                                                                                        [ ]
- ------------ ---------------------------------------------------------------------------------------------------------

11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                    0.2%
- ------------ ---------------------------------------------------------------------------------------------------------

12           TYPE OF REPORTING PERSON*
                                                                                                    PN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                                         *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>

<TABLE>
<CAPTION>
- ----------------------------------------------------------                    ---------------------------------------
CUSIP NO. 73172K 10 4                                            13 G                   Page 5 of 13 Pages
- ----------------------------------------------------------                    ---------------------------------------
<S>          <C>                                                                    <C>              <C>  
- ------------ ---------------------------------------------------------------------------------------------------------
1            NAME OF REPORTING PERSONS
             SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
                      Accel III Associates L.P. ("A3A")

- ------------ ---------------------------------------------------------------------------------------------------------
2
             CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                    (a) [ ]          (b) [X]
- ------------ ---------------------------------------------------------------------------------------------------------

3            SEC USE ONLY
- ------------ ---------------------------------------------------------------------------------------------------------

4            CITIZENSHIP OR PLACE OF ORGANIZATION
                      Delaware
- ------------ ---------------------------------------------------------------------------------------------------------

             NUMBER OF               5        SOLE VOTING POWER
              SHARES                          0 shares
           BENEFICIALLY
           OWNED BY EACH 
             REPORTING
              PERSON
               WITH
                                     -------- ------------------------------------------------------------------------

                                     6        SHARED VOTING POWER
                                              1,158,695  shares,  all of which are shares directly owned by A3. A3A is
                                              the general partner of A3, and may be deemed to have shared voting power
                                              with respect to such shares.
                                     -------- ------------------------------------------------------------------------

                                     7        SOLE DISPOSITIVE POWER
                                              0 shares
                                     -------- ------------------------------------------------------------------------

                                     8        SHARED DISPOSITIVE POWER
                                              1,158,695  shares,  all of which are shares directly owned by A3. A3A is
                                              the general partner of A3, and may be deemed to have shared  dispositive
                                              power with respect to such shares.
- ------------------------------------ -------- ------------------------------------------------------------------------

9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       1,158,695
- ------------ ---------------------------------------------------------------------------------------------------------

10           CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
             EXCLUDES CERTAIN SHARES*
                                                                                                        [ ]
- ------------ ---------------------------------------------------------------------------------------------------------

11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                    3.9%
- ------------ ---------------------------------------------------------------------------------------------------------

12           TYPE OF REPORTING PERSON*
                                                                                                    PN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                                         *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>

<TABLE>
<CAPTION>
- ----------------------------------------------------------                    ---------------------------------------
CUSIP NO. 73172K 10 4                                            13 G                   Page 6 of 13 Pages
- ----------------------------------------------------------                    ---------------------------------------
<S>          <C>                                                                    <C>              <C>  
- ------------ ---------------------------------------------------------------------------------------------------------
1            NAME OF REPORTING PERSONS
             SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
                      Swartz Family Partnership L.P. ("SFP")

- ------------ ---------------------------------------------------------------------------------------------------------
2
             CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                    (a) [ ]          (b) [X]
- ------------ ---------------------------------------------------------------------------------------------------------

3            SEC USE ONLY
- ------------ ---------------------------------------------------------------------------------------------------------

4            CITIZENSHIP OR PLACE OF ORGANIZATION
                      Delaware
- ------------ ---------------------------------------------------------------------------------------------------------

             NUMBER OF               5        SOLE VOTING POWER
              SHARES                          0 shares
           BENEFICIALLY
           OWNED BY EACH
             REPORTING
              PERSON
               WITH
                                     -------- ------------------------------------------------------------------------

                                     6        SHARED VOTING POWER
                                              1,158,695  shares,  of which  1,158,695 are shares directly owned by A3.
                                              SFP is a general  partner of A3A, the general  partner of A3, and may be
                                              deemed to have shared voting power with respect to such shares.
                                     -------- ------------------------------------------------------------------------

                                     7        SOLE DISPOSITIVE POWER
                                              0 shares
                                     -------- ------------------------------------------------------------------------

                                     8        SHARED DISPOSITIVE POWER
                                              1,158,695  shares,  of which  1,158,695 are shares directly owned by A3.
                                              SFP is a general  partner of A3A, the general  partner of A3, and may be
                                              deemed to have shared dispositive power with respect to such shares.
- ------------------------------------ -------- ------------------------------------------------------------------------

9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       1,158,695
- ------------ ---------------------------------------------------------------------------------------------------------

10           CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
             EXCLUDES CERTAIN SHARES*
                                                                                                        [ ]
- ------------ ---------------------------------------------------------------------------------------------------------

11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                    3.9%
- ------------ ---------------------------------------------------------------------------------------------------------

12           TYPE OF REPORTING PERSON*
                                                                                                    PN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                                        * SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>

<TABLE>
<CAPTION>
- ----------------------------------------------------------                    ---------------------------------------
CUSIP NO. 73172K 10 4                                            13 G                   Page 7 of 13 Pages
- ----------------------------------------------------------                    ---------------------------------------
<S>          <C>                                                                    <C>              <C>  
- ------------ ---------------------------------------------------------------------------------------------------------
1            NAME OF REPORTING PERSONS
             SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
                      James W. Breyer ("Breyer")

- ------------ ---------------------------------------------------------------------------------------------------------
2            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                    (a) [ ]          (b) [X]
- ------------ ---------------------------------------------------------------------------------------------------------

3            SEC USE ONLY
- ------------ ---------------------------------------------------------------------------------------------------------
4            CITIZENSHIP OR PLACE OF ORGANIZATION
                      U.S. Citizen
- ------------ ---------------------------------------------------------------------------------------------------------

             NUMBER OF               5        SOLE VOTING POWER
              SHARES                          26,572 shares
           BENEFICIALLY
           OWNED BY EACH
             REPORTING
              PERSON
               WITH
                                     -------- ------------------------------------------------------------------------

                                     6        SHARED VOTING POWER
                                              1,369,366 shares, of which 1,158,695 are shares directly owned by A3 and
                                              210,671 are shares  directly  owned by AJ.  Breyer may be deemed to have
                                              shared voting power with respect to such shares.
                                     -------- ------------------------------------------------------------------------

                                     7        SOLE DISPOSITIVE POWER
                                              26,572 shares
                                     -------- ------------------------------------------------------------------------

                                     8        SHARED DISPOSITIVE POWER
                                              1,369,366 shares, of which 1,158,695 are shares directly owned by A3 and
                                              210,671 are shares  directly  owned by AJ.  Breyer may be deemed to have
                                              shared dispositive power with respect to such shares.
- ------------------------------------ -------- ------------------------------------------------------------------------

9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       1,395,938
- ------------ ---------------------------------------------------------------------------------------------------------

10           CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
             EXCLUDES CERTAIN SHARES*
                                                                                                        [ ]
- ------------ ---------------------------------------------------------------------------------------------------------

11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                    4.7%
- ------------ ---------------------------------------------------------------------------------------------------------

12           TYPE OF REPORTING PERSON*
                                                                                                    IN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                                        o SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>

<TABLE>
<CAPTION>
- ----------------------------------------------------------                    ---------------------------------------
CUSIP NO. 73172K 10 4                                            13 G                   Page 8 of 13 Pages
- ----------------------------------------------------------                    ---------------------------------------
<S>          <C>                                                                    <C>              <C>  
- ------------ ---------------------------------------------------------------------------------------------------------
1            NAME OF REPORTING PERSONS
             SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
                      Paul H. Klingenstein ("Klingenstein")

- ------------ ---------------------------------------------------------------------------------------------------------
2            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                    (a) [ ]          (b) [X]
- ------------ ---------------------------------------------------------------------------------------------------------

3            SEC USE ONLY
- ------------ ---------------------------------------------------------------------------------------------------------
4            CITIZENSHIP OR PLACE OF ORGANIZATION
                      U.S. Citizen
- ------------ ---------------------------------------------------------------------------------------------------------

             NUMBER OF               5        SOLE VOTING POWER
              SHARES                          48,636 shares
           BENEFICIALLY
           OWNED BY EACH
             REPORTING
              PERSON
               WITH
                                     -------- ------------------------------------------------------------------------

                                     6        SHARED VOTING POWER
                                              1,422,034  shares,  of which  1,158,695 are shares directly owned by A3,
                                              210,671  are  shares  directly  owned by AJ,  and  52,668  of which  are
                                              directly owned by AI91. Klingenstein may be deemed to have shared voting
                                              power with respect to such shares.
                                     -------- ------------------------------------------------------------------------

                                     7        SOLE DISPOSITIVE POWER
                                              48,636 shares
                                     -------- ------------------------------------------------------------------------

                                     8        SHARED DISPOSITIVE POWER
                                              1,422,034  shares,  of which  1,158,695 are shares directly owned by A3,
                                              210,671  are  shares  directly  owned by AJ,  and  52,668  of which  are
                                              directly owned by AI91. Klingenstein may be deemed to have shared voting
                                              power with respect to such shares.
- ------------------------------------ -------- ------------------------------------------------------------------------

9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                        1,470,670
- ------------ ---------------------------------------------------------------------------------------------------------

10           CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
             EXCLUDES CERTAIN SHARES*
                                                                                                        [ ]
- ------------ ---------------------------------------------------------------------------------------------------------

11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                    5.0%
- ------------ ---------------------------------------------------------------------------------------------------------

12           TYPE OF REPORTING PERSON*
                                                                                                    IN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                                        * SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>

<TABLE>
<CAPTION>
- ----------------------------------------------------------                    ---------------------------------------
CUSIP NO. 73172K 10 4                                            13 G                   Page 9 of 13 Pages
- ----------------------------------------------------------                    ---------------------------------------
<S>          <C>                                                                    <C>              <C>  
- ------------ ---------------------------------------------------------------------------------------------------------
1            NAME OF REPORTING PERSONS
             SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
                      Arthur C. Patterson ("Patterson")

- ------------ ---------------------------------------------------------------------------------------------------------
2            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                    (a) [ ]          (b) [X]
- ------------ ---------------------------------------------------------------------------------------------------------
3            SEC USE ONLY

- ------------ ---------------------------------------------------------------------------------------------------------
4            CITIZENSHIP OR PLACE OF ORGANIZATION
                      U.S. Citizen
- ------------ ---------------------------------------------------------------------------------------------------------

             NUMBER OF               5        SOLE VOTING POWER
              SHARES                          75,417  shares,  of  which  30,109  are  directly  owned by  Ellmore  C.
           BENEFICIALLY                       Patterson  Partners  ("ECPP").  Patterson is the general partner of ECPP
           OWNED BY EACH                      and may be deemed to have sole voting power with respect to such shares.
             REPORTING                                                                                                
              PERSON                 -------- ------------------------------------------------------------------------
               WITH                  6        SHARED VOTING POWER
                                              1,422,034  shares,  1,158,695 of which are directly owned by A3, 210,671
                                              of which are  directly  owned by AJ,  and  52,668 of which are  directly
                                              owned by AI91.  Patterson may be deemed to have shared voting power with
                                              respect to such shares.
                                     -------- ------------------------------------------------------------------------

                                     7        SOLE DISPOSITIVE POWER
                                              75,417  shares,  of  which  30,109  are  directly  owned by  Ellmore  C.
                                              Patterson  Partners  ("ECPP").  Patterson is the general partner of ECPP
                                              and may be deemed to have sole  dispositive  power with  respect to such
                                              shares.
                                     -------- ------------------------------------------------------------------------

                                     8        SHARED DISPOSITIVE POWER
                                              1,422,034  shares,  1,158,695 of which are directly owned by A3, 210,671
                                              of which are  directly  owned by AJ,  and  52,668 of which are  directly
                                              owned by AI91.  Patterson may be deemed to have shared dispositive power
                                              with respect to such shares.
- ------------------------------------ -------- ------------------------------------------------------------------------

9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                        1,497,451
- ------------ ---------------------------------------------------------------------------------------------------------

10           CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
             EXCLUDES CERTAIN SHARES*
                                                                                                        [ ]
- ------------ ---------------------------------------------------------------------------------------------------------

11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                    5.1%
- ------------ ---------------------------------------------------------------------------------------------------------

12           TYPE OF REPORTING PERSON*
                                                                                                    IN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                                        o SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>

<TABLE>
<CAPTION>
- ----------------------------------------------------------                    ---------------------------------------
CUSIP NO. 73172K 10 4                                            13 G                  Page 10 of 13 Pages
- ----------------------------------------------------------                    ---------------------------------------
<S>          <C>                                                                    <C>              <C>  
- ------------ ---------------------------------------------------------------------------------------------------------
1            NAME OF REPORTING PERSONS
             SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
                      G. Carter Sednaoui ("Sednaoui")

- ------------ ---------------------------------------------------------------------------------------------------------
2            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                    (a) [ ]          (b) [X]
- ------------ ---------------------------------------------------------------------------------------------------------

3            SEC USE ONLY
- ------------ ---------------------------------------------------------------------------------------------------------
4            CITIZENSHIP OR PLACE OF ORGANIZATION
                      U.S. Citizen
- ------------ ---------------------------------------------------------------------------------------------------------

             NUMBER OF               5        SOLE VOTING POWER
              SHARES                          0 shares
           BENEFICIALLY
           OWNED BY EACH
             REPORTING
              PERSON
               WITH
                                     -------- ------------------------------------------------------------------------

                                     6        SHARED VOTING POWER
                                              1,369,366 shares, of which 1,158,695 are shares directly owned by A3 and
                                              210,671 are shares  directly owned by AJ. Sednaoui may be deemed to have
                                              shared voting power with respect to such shares.
                                     -------- ------------------------------------------------------------------------

                                     7        SOLE DISPOSITIVE POWER
                                              0 shares
                                     -------- ------------------------------------------------------------------------

                                     8        SHARED DISPOSITIVE POWER
                                              1,369,366 shares, of which 1,158,695 are shares directly owned by A3 and
                                              210,671 are shares  directly owned by AJ. Sednaoui may be deemed to have
                                              shared dispositive power with respect to such shares.
- ------------------------------------ -------- ------------------------------------------------------------------------

9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       1,369,366
- ------------ ---------------------------------------------------------------------------------------------------------

10           CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
             EXCLUDES CERTAIN SHARES*
                                                                                                        [ ]
- ------------ ---------------------------------------------------------------------------------------------------------

11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                    4.6%
- ------------ ---------------------------------------------------------------------------------------------------------

12           TYPE OF REPORTING PERSON*
                                                                                                    IN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                                        o SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>

<TABLE>
<CAPTION>
- ----------------------------------------------------------                    ---------------------------------------
CUSIP NO. 73172K 10 4                                            13 G                  Page 11 of 13 Pages
- ----------------------------------------------------------                    ---------------------------------------
<S>          <C>                                                                    <C>              <C>  
- ------------ ---------------------------------------------------------------------------------------------------------
1            NAME OF REPORTING PERSONS
             SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
                      James R. Swartz ("Swartz")

- ------------ ---------------------------------------------------------------------------------------------------------
2            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                    (a) [ ]          (b) [X]
- ------------ ---------------------------------------------------------------------------------------------------------

3            SEC USE ONLY
- ------------ ---------------------------------------------------------------------------------------------------------
4            CITIZENSHIP OR PLACE OF ORGANIZATION
                      U.S. Citizen
- ------------ ---------------------------------------------------------------------------------------------------------

             NUMBER OF               5        SOLE VOTING POWER
              SHARES                          45,463 shares, of which 25,000 represent immediately exercisable
           BENEFICIALLY                       options.
           OWNED BY EACH
             REPORTING
              PERSON
               WITH
                                     -------- ------------------------------------------------------------------------

                                     6        SHARED VOTING POWER
                                              1,422,034  shares,  1,158,695 of which are directly owned by A3, 210,671
                                              of which are  directly  owned by AJ,  and  52,668 of which are  directly
                                              owned by AI91.  Swartz may be deemed to have  shared  voting  power with
                                              respect to such shares.
                                     -------- ------------------------------------------------------------------------

                                     7        SOLE DISPOSITIVE POWER
                                              45,463  shares,  of  which  25,000  represent  immediately   exercisable
                                              options.
                                     -------- ------------------------------------------------------------------------

                                     8        SHARED DISPOSITIVE POWER
                                              1,422,034  shares,  1,158,695 of which are directly owned by A3, 210,671
                                              of which are  directly  owned by AJ,  and  52,668 of which are  directly
                                              owned by AI91.  Swartz may be deemed to have  shared  dispositive  power
                                              with respect to such shares.
- ------------------------------------ -------- ------------------------------------------------------------------------

9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       1,467,497
- ------------ ---------------------------------------------------------------------------------------------------------

10           CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
             EXCLUDES CERTAIN SHARES*
                                                                                                        [ ]
- ------------ ---------------------------------------------------------------------------------------------------------

11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                    5.0%
- ------------ ---------------------------------------------------------------------------------------------------------

12           TYPE OF REPORTING PERSON*
                                                                                                    IN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                                        o SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>

- ------------------------------                   -------------------------------
CUSIP NO. 73172K 10 4               13 G                  Page 12 of 13 Pages
- ------------------------------                   -------------------------------

                  This  statement  amends the Statement on Schedule 13G filed by
                  Accel III L.P., Accel Japan L.P.  ("AJ"),  Accel Investors '91
                  L.P. ("A91"),  Accel III Associates L.P. ("A3"), Swartz Family
                  Partnership L.P. ("SFP"), James W. Breyer ("Breyer"),  Paul H.
                  Klingenstein ("Klingenstein"), Arthur Patterson ("Patterson"),
                  G. Carter Sednaoui  ("Sednaoui"),  and James Swartz ("Swartz")
                  (collectively  referred to as the "Reporting  Persons").  Only
                  those Items as to which there has been a change of information
                  are included in this Amendment.

ITEM 2(b).        ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE:

                  The address of the  principal  business  office of each of the
                  Reporting Persons is:

                  428 University Avenue
                  Palo Alto, CA 94301

ITEM 4.           OWNERSHIP:

                  The following information with respect to the ownership of the
                  Common  Stock  of  the  issuer  by  the  persons  filing  this
                  Statement is provided as of December 31, 1998:

                      (a)  Amount beneficially owned:

                           See Row 9 of cover page for each Reporting Person.

                      (b)  Percent of Class:

                           See Row 11 of cover page for each Reporting Person.

                      (c)  Number of shares as to which such person has:

                             (i)   Sole power to vote or to direct the vote:

                                   See Row 5 of cover  page  for each  Reporting
                                   Person.

                             (ii)  Shared power to vote or to direct the vote:

                                   See Row 6 of cover  page  for each  Reporting
                                   Person.

                             (iii) Sole  power  to  dispose  or  to  direct  the
                                   disposition of:

                                   See Row 7 of cover  page  for each  Reporting
                                   Person.

                             (iv)  Shared  power to  dispose  or to  direct  the
                                   disposition of:

                                   See Row 8 of cover  page  for each  Reporting
                                   Person.


<PAGE>


                                   SIGNATURES
                                   ----------

                  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.

Dated:  February 12, 1999

Entities:

Accel III L.P.
Accel Japan L.P.
Accel Investors '91 L.P.
Accel III Associates L.P.
Swartz Family Partnership L.P.

                                  By:   /s/  G. Carter Sednaoui
                                        ------------------------------------
                                        G. Carter Sednaoui, Attorney-in-fact
                                        for above-listed entities
Individuals:

James W. Breyer
Paul H. Klingenstein
Arthur C. Patterson
G. Carter Sednaoui
James R. Swartz
                                  By:   /s/  G. Carter Sednaoui
                                        ---------------------------------------
                                        G. Carter Sednaoui, Individually and as
                                        Attorney-in-fact for above-listed 
                                        individuals





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