The scallop is described as a bivalve shell-fish, having the valves generally unequal. The hinge is without teeth, but furnished with a somewhat oval cavity, and mostly with lateral transverse grooves. From a similarity in the structure of the hinge, oysters and scallops hare been classified as one tribe; but they differ very essentially both in their external appearance and their habits. Oysters adhere to rocks, or, as in two or three species, to roots of trees on the shore; while the scallops are always detached, and usually lurk in the sand.
Salmon
