Late Pliocene to Late Pleistocene; Extinct.
South Florida to North Carolina.
Original description (from Conrad, 1832):
"Oblong, sinuous, rather thin; ribs numerous, crossed by striae, which are equally distinct in the interstices; ribs double on the posterior side where they alternate with fine lines; umbo angulated behind; hinge area narrow, oblique, and transversely striated; basal margin contracted near the middle; inner margin crenate.
Localities. Newbern, N. C. common; Mr. Nuttal. James River, Va. very rare. Upper Tertiary.
This shell has a greneral [sic] resemblance to Arca ponderosa, of Say, but cannot be confounded with that species."