Late Pliocene to Late Pleistocene; Extinct.
Costa Rica to southern Florida.
Original Description (from M. Smith, 1938, p. 89):
"Sculpture fine, spiny processes sharp; shell inclined to be rather slender when compared with West Indian recent examples which are more rudely sculptured. The new subspecies appear to agree with living specimens from the Florida east coast and which may also bear the same name. Holotype deposited in the Museum of Comparative Zoology 22 mm. long; paratypes in the author's collection 26 mm. long. PL 6, fig. 6. Pliocene, Clewiston, Florida."
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