Early Miocene to Middle Miocene; Extinct.
Original Description (from Dall, 1892, p. 329):
"Older Miocene of the Chipola beds, Florida, Hums; of Santo Domingo, Sowerby; Chesapeake Miocene of Duplin Co., N. C., Burns; newer Miocene of the Cape Fear River, N. C, Johnson; and of South Carolina at Darlington, Holmes; Pliocene of Costa Rica, Gabb; Post- Pliocene of South Carolina at Simmons's Bluff, Burns; living off the coast of the United States from Cape Hatteras to the West Indies and Texas, in rather deep water.
The North Carolina fossil exactly resembles the recent shell unless the granulations are slightly more prominent in the former, a character which is not constant within the species. Those from Chipola are all small specimens, but agree perfectly with the younger granulatum except in having the periphery and basal ribs conspicuously beaded. They may form a variety chipolanum."
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