Cerion pillsburyi Pilsbry and Vanatta, 1897

Original Description

"Cerion Pillsburyi P. & V. Fig. 5

Shell tapering subcylindrical, the later three whorls of nearly equal diameter, those above forming a rather long cone, which passes very gradually into the subcylindrical portion; apex very obtuse. Whorls 10 to 10½ , the nepionic smooth, next whorl sharply finely striate or smoothish; all succeeding whorls except the lastone-half to two, flat and smooth with some growth lines only; last one-half or two whorls regularly costulate, riblets narrower than the intervals, about one millimeter apart. Base rounded, not compressed; umbilical chink very short, imperforate. White with irregular, interrupted brown or gray brown streaks.

Aperture vertical; pariatal tooth very small, weak and short; columellar fold distinct, extending inward one whorl. Peristome well reflexed, whitish, rather thin or thickened; parietal callus moderate or very thin.

Alt. 29, diam. of last whorl above aperture 11-12; alt. of aperture 11 mm.

Alt. 28½ , diam. of last whorl above aperture 11; alt. of aperture 10 mm.

Gun Cay, Bahamas (Dr. William H. Rush, U.S.N.).

The rather long and gradually tapering cone, smooth surface above, the last one or two whorls ribbed, and very small parietal tooth, are the most prominent features of this species. Its resemblance to C. regina eucosmium is remarkable; but the small area behind the columellar lip, with short rimation and rounded base, distinguishes it at once from that form. It is superficially not far from some of the Cayman Is. species, but has not the long and strong parietal tooth of those forms.

At the request of Dr. Rush, this species is named in honor of Lieutenant-Commander John Elliot Pillsbury, of the U.S. Coast Survey Steamer "Blake."" " (Pilsbry and Vanatta, 1897:366-367).

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