Brookline (Mass.) Retirement System hired Boston Co. to run a $20 million in a commingled international equity fund, said Frank Zecha, director. The $175 million pension plan had invested the money in a similar fund run by Fidelity Investments, which did not rebid, Mr. Zecha said. The portfolio's original manager, Putnam, was terminated in November. He declined to provide further details. Meketa Investment Group assisted.