Former members of the Common Council and Board of Aldermen are invited to a commemorative photo session Monday at 6:30 p.m. in City Hall. The photo, which will be displayed in City Hall, is being taken to mark the end of the city's two-branch form of government. In January, a new 11-member City Council will replace the 25-member bicameral legislature, which dates to Colonial times. "The transition is historic," said City Clerk Michael Matarazzo, a former councilor. "We'd like as many members as possible to sit for the photo. So many people have served the city over the years."