Exhibit 23.1

                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

As independent public accountants, we hereby consent to the incorporation of our
report included in this Form 10-K for the year ended December 31, 1999 into the
Company's previously filed Registration Statements on Form S-8 (File No.
333-74173, File No. 333-74175 and File No. 333-86075) and Registration Statement
on Form S-3 (File No. 333-90989).



                                                       /s/ Arthur Andersen LLP



Boston, Massachusetts
March 22, 2000