FILED PURSUANT TO RULE 424(b)(3) AND (c)
                                                     FILE NUMBER 333-51591



             PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED JULY 20, 1998

                                 722,672 SHARES

                                   LYCOS, INC.

                                  COMMON STOCK



This  Prospectus  Supplement  (the  "Prospectus   Supplement")  supplements  the
Prospectus dated May 7, 1998 (the  "Prospectus") of Lycos,  Inc. ("Lycos" or the
"Company") relating to the public offering, which is not being underwritten, and
sale of up to 722,672  shares of Common  Stock,  par value  $0.01 per share (the
"Shares")  of the  Company,  which may be offered  and sold from time to time by
certain stockholders of the Company or by pledgees, donees, transferees or other
successors  in  interest  that  receive  such  shares  as  a  gift,  partnership
distribution or other non-sale  related  transfer (the "Selling  Stockholders").
The Company will  receive no part of the  proceeds of such sales.  Of the Shares
offered under the Prospectus,  722,672 Shares were originally issued or reserved
for issuance by the Company in  connection  with the  Company's  acquisition  of
WiseWire Corporation,  a Pennsylvania corporation,  by and through a merger of a
wholly-owned  subsidiary of Lycos, Wise Acquisition  Corporation,  with and into
WiseWire Corporation (the "Acquisition").  The "Selling Stockholders" Section of
the Prospectus is hereby supplemented to reflect the distribution of shares held
in the name of Dennis Ciccone by the Ciccone-Leifeld  Joint Venture, the Ciccone
Joint  Venture # 1 and the  Ciccone  Joint  Venture  #2  (together,  the  "Joint
Ventures")  of 15,562  Shares to joint  venture  partners  after the date of the
Prospectus.  This Prospectus  Supplement  should be read in conjunction with the
Prospectus, and is qualified by reference to the Prospectus except to the extent
that the information  herein contained  supersedes the information  contained in
the Prospectus.  Capitalized  terms used in this  Prospectus  Supplement and not
otherwise defined herein have the meanings specified in the Prospectus.








             THE DATE OF THIS PROSPECTUS SUPPLEMENT IS JULY 20, 1998

                              SELLING STOCKHOLDERS


         Fifteen  Thousand  Five  Hundred  Sixty  Two  (15,562)  of  the  Shares
beneficially  owned by the Joint Ventures and reflected in the Prospectus  under
the name Dennis Ciccone were  distributed  to the joint venture  partners of the
Joint  Ventures  on July 1,  1998.  The  table of  Selling  Stockholders  in the
Prospectus is hereby amended to reflect such  distribution by the Joint Ventures
and  supplemented  to  specifically  include the  entities and  individuals  who
received such  distribution.  The following table sets forth as of July 1, 1998,
the number of Shares owned  beneficially  by Dennis Ciccone and the name of each
of the entities and individuals who received Shares through the  distribution by
the Joint  Ventures,  and the  number of shares of Common  Stock  that each such
Selling  Stockholder  beneficially owns as of such date, the number of shares of
Common Stock  beneficially  owned by each such Selling  Stockholder  that may be
offered  for  sale  from  time to time by the  Prospectus  and  this  Prospectus
Supplement,  the number of shares of Common  Stock to be  beneficially  owned by
each such Selling Stockholder  assuming the sale of all of the Shares offered by
such Selling  Stockholders  and the percentage of the outstanding  shares of the
Company's Common Stock to be beneficially owned by each such Selling Stockholder
after completion of the offering.

         Except as set  forth in this  Prospectus  Supplement  with  respect  to
Dennis Ciccone and the  distribution to the joint venture  partners of the Joint
Ventures,  there is no change to the section entitled "Selling  Stockholders" in
the  Prospectus.  The Company may amend or supplement  the  Prospectus  and this
Prospectus  Supplement  from time to time to  update  the  disclosure  set forth
therein and herein.


                                                                                                  SHARES
                                                             SHARES WHICH MAY                  BENEFICIALLY
                                             SHARES          BE SOLD PURSUANT                  OWNED  AFTER
                                           BENEFICIALLY      TO THE PROSPECTUS                OFFERING(1)(2)(3)
                                             OWNED(1)(2)     AND THIS PROSPECTUS
SELLING STOCKHOLDER                      AS OF 6/30/98          SUPPLEMENT(2)                 NUMBER  PERCENT
                                                                                           
 
Charles R. Burke                              832                    832                       --       *
Dennis Ciccone (4)                          6,755                  6,755                       --       *
Thomas J. Gillespie                           832                    832                       --       *
Hunter Associates, Inc.                       224                    224                       --       *
David W. Hunter                               832                    832                       --       *
Paul & Cynthia Liefeld                      4,845                  4,845                       --       *
Hugh A. McMaster, III                         205                    205                       --       *
Robert F. Shapiro                             832                    832                       --       *
Winfield S. Smathers IV                       205                    205                       --       *


*   Less than 1.0%.




(1)      The number and percentage of shares beneficially owned is determined in
         accordance  with Rule 13d-3 of the Exchange Act, and the information is
         not  necessarily  indicative  of  beneficial  ownership  for any  other
         purpose.  Under such rule,  beneficial ownership includes any shares as
         to which the  individual  has sole or shared voting power or investment
         power and also any shares which the individual has the right to acquire
         within 60 days of the date of this  Prospectus  through the exercise of
         any stock  option or other  right.  Unless  otherwise  indicated in the
         footnotes,  each person has sole voting and investment power (or shares
         such powers with his or her spouse) with respect to the shares shown as
         beneficially owned.

(2)      Includes an  aggregate of 82,437  shares of Common  Stock  beneficially
         owned by the Selling  Stockholders  that have been  deposited in escrow
         pursuant   to  the   Merger   Agreement   to  secure   the   respective
         indemnification obligations of the Selling Stockholders thereunder (the
         "Escrowed   Shares").    Each   Selling   Stockholder   has   deposited
         approximately  11.41% of his shares in the escrow.  The Escrowed Shares
         will be released  from escrow on April 30, 1999 only to the extent that
         no claims have been made  against the  Escrowed  Shares.  The  Escrowed
         Shares may not be sold by the Selling  Stockholders  prior to April 30,
         1999, except as otherwise provided in the Escrow Agreement.

(3)      Assumes that each Selling  Stockholder  will sell all of the Shares set
         forth  above  under   "Shares  Which  May  Be  Sold  Pursuant  to  This
         Prospectus".  There can be no assurance  that the Selling  Stockholders
         will sell all or any of the Shares offered hereunder.

(4)      In connection  with the  Acquisition,  Dennis  Ciccone  entered into an
         employment agreement with the Company pursuant to which he was employed
         as the Vice  President of Mergers and  Acquisitions  of the Company.  A
         portion of the shares of Common Stock held by him is subject to certain
         restrictions  on transfer  contained in the  employment  agreement with
         him.


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