Cyprinidæ (MOLLUSKS)

Family of Lamellibranchs, with regular, oval, equivalved shell covered with strong epidermis. The hinge has one to three cardinal teeth, and one hinder lateral tooth. The pallial line is simple, and the mantle-edges fuse to form two siphons, an upper (dorsal) excurrent one, and a lower (ventral) incurrent one. It is because of these siphons sip that these clams can burrow in the sand, for the siphons stretch up and communicate with the water. IMG:content-1071.png:[blocks in formation]