Methuen (Mass.) Contributory Retirement System, with $68 million in assets, hired New Amsterdam Partners to manage $25 million in active domestic large-cap core equities, subject to contract negotiations, said Kevin Leonard, the Segal Advisors consultant who is assisting. Terrylee Murphy, administrator, directed all questions to Mr. Leonard. Funding will come from terminating the existing large-cap core equity manager, whose performance has been lagging. Mr. Leonard declined to name the manager, but Money Market Directories lists INVESCO as Methuen's large-cap equity manager. An INVESCO spokesman wouldn't comment.