there are close to 350 living species of lamp shells,on brachiopods.thousands of other shells have a shell with two parts,or vales are dorsal and ventral to the body in contrast to the latcral valves of clams.when the valvesare opened,another major difference between lamp shell and clams is apparent.lamp shells have aconspicuous lophophre,consisting of at least two coiled and ciliated arms,thar occupies most of the space between the valves.rocks or burrowing in soft sediments