p.1

Crassatella rhomboidea, Conrad, Am. Jour. Sc. 2d. Ser. vol. 1 p. 396 [pl 3 fig. 5]

Oblong, rhomboidal; anterior margin obliquely sub-truncated at base; posterior margin obliquely and widely truncated, the inferior extremity rounded; posterior dorsal margin not very oblique; basal margin slightly curved.