p.2

Cardita tridentata say. Am.
Conch. pl 40 figs. 1-5;—DeKay, nat.
Hist. of N.Y. p. 205; venericardia
tridentata say, Jour. Acad. Nat. Sc. Vol. 5
p 216.

Shell suborbicular, subequilateral
thick and ponderous, with about 18
convex ribs, can cellate; obsolete in
the [umbo?] and anterior side; inner
margin deeply crenate; hinge with
two diverging teeth in one valve, [one]
separated by a large cavity; on the other
a large prominent [recurved?] tooth
closing into the cavity.

L 0.25