Cerion (Strophiops) canonicum Dall, 1905

Original Description

            "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 Cuba. All but one of the specimens obtained were subfossiI. U. S. Nat. Mus., No. 127,460."  (Dall, 1905b:439)

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