Exhibit 23.1 - ------------ CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS As independent public accountants, we hereby consent to the use of our report included in this Form 10-K, into the Company's previously filed Registration Statement on Form S-1 File No. 33-94054 and the Company's previously filed Registration Statements on Form S-8 File Nos. 33-98786, 333-46863 and 333-46899. ARTHUR ANDERSEN LLP Boston, Massachusetts March 27, 1998