"Shell stout, solid, whitish or pale brown, sub-cylindric, short, strongly sparsely ribbed and spirally striated. Nucleus prominent, of two and a half whorls, at first smooth then finely transversely striated; subsequent whorls six or seven, with a tendency to constriction a little in front of the suture; the penultimate whorl has about 20 nearly vertical ribs, the interspaces wider and more or less distinctly spirally striated; last whorl rising to the upper third of the whorl at the aperture which is large, with a thin callus on the body and a simple broadly reflected peristome; the umbilicus closed or nearly so; parietal lamina strong, long, extending three quarters of a whorl, axial lamina feeble. Extremes of measurement:
Height of Shell. Aperture Max. Diameter
30.0 11.0 12.0 mm.
27·0 9.0 13.0 "
Gun Cay, Wild Duck expedition. This species was erroneously identified as C. pannosum Maynard, which is devoid of spiral sculpture, and comes from south of