EXHIBIT 23.1

                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

    As independent public accountants, we hereby consent to the incorporation of
our reports included in this Amendment No. 1 to Annual Report on Form 10-K, into
the Company's previously filed Registration Statements on Form S-8 (File Nos.
033-75934, 333-04280, 333-08047 and 333-75339) and Form S-3 (File Nos.
333-05939, 333-37921, 333-87157 and 333-94859).

                                          /s/ Arthur Andersen LLP

Boston, Massachusetts
August 14, 2000