Distinguished from the Solen by being without teeth at the hinge.
Shell covered with epidermis, slightly irregular, elongated, gaping at
the two extremities, equivalve, inequilateral; the summits but little
marked; hinge toothless; a longitudinal callosity; ligament exterior,
affixed to very projecting callosities on the shortest side of the
shell; two distinct muscular impressions.
Glycimeris margaritacea.
Glycimeris siliqua.
_G. siliqua._ The podlike Glycimeris.
Transversely oblong, covered with a black epidermis; umbones
decorticated; internal disc of the valves white, thick, and callous.
FAMILY IV.
MYARIA. Two genera.