Late Pliocene to Early Pleistocene; Extinct.
Southern Florida to Georgia.
Original Description (from Dall, 1890, p. 32):
"Caloosahatchie beds; rare.
Shell thick and solid, short-fusiform, strongly sculptured; whorls about ten; spiral sculpture undulated by the ribs and comprising a single very small thread at the suture separated by a shallow gutter from a very strong, sharp and elevated waved keel; in front of this is the wide, deep anal fasciole; then come (on the upper whorls two or three, on the last whorl eight) strong, uniform sharp threads separated by wider, uniform interspaces; then the canal with rounder, smaller crowded threads; between the primaries is fine uniform spiral striation, fainter on the fasciole; transverse sculpture of (on the last whorl seven) strong, rounded ribs, broadest at the shoulder and extending to the constriction behind the canal, with narrower interspaces; there is also more or less fine transverse striation caused by the strong incremental lines; the last rib is swollen and varicose; notch short, rounded; body-callus well developed with a posterior nodule opposite the notch; outer lip sharp, arcuate; throat without liræ; canal short, shallow; an umbilical chink behind the callus on the pillar; aperture narrow. Max. Ion. of shell 20.0; max. Iat. 8.2 mm.
Only two specimens of this strongly marked species were obtained from the marl."
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