Cerion regina Pilsbry & Vanatta, 1895

Original Description

Original Description: "Shell like C. regium Bens. In form, color, and the expanded, excavated umbilical area; lip narrower; ribless except on the last whorl, which has fewer irregularly spaced ribs, or in some specimens uneven, sparse ribs are found throughout the cylindrical portion.  Parietal tooth short. Alt. 30-33½ ; diam. 12 mm. Turk's Island (Swift, Gabb).  This species has affinities with C. columna of Inagua, C. regium of Castle Island, C. lentiginosum and C. album of Rum Cay. The first is more elongated and pillar-like, with very dark mouth; the second is stouter, heavier, with far wider, thicker lip - in fact, a lip of quite Ethiopian characteristics; and the two forms from Rum Cay are distinguished from all the preceding by the close, even microscopic costulation of their earlier whorls. "  (Pilsbry & Vanatta, 1895:208)

Supplemental description: "Shell thick, subcylindrical, gradually tapering above, the long terminal cone passing gradually into cylindrical portion; lower 3 whorls of about equal diameter; apex obtuse; earlier whorls not striate; chalk-white and dull, the smoothness of the surface but little broken by slight growth-lines, the basal whorl irregularly and rather distantly costate, at least on its latter half. Whorls 10 to 10½, flat, with superficial, seam-like sutures. Last whorl suddenly ascending in front, much compressed and pinched toward the base. Umbilicus open or perforate, with the usual arcuate rimation, below which it is broadly excavated and flattened.

Aperture oblong-cordate, slightly less than one-third the length of shell, higher than wide, dark or light brown within, rarely pur­plish. Peristome expanded and reflexed, its face convex but not much thickened, whitish, parietal callus moderate, its outer edge not raised. Axial lamina situated high, narrow and inconspicuous from in front. Parietal tooth low, small, varying from moderately short to long, central in position.

Alt. 31½, diam. 11¾ mill.

Alt. 33, diam. 12½ mill. (average typical specimen).

Alt. 38, diam. 13 mill.

Turk's Island, Bahamas. (Gabb, Swift)."  (Pilsbry & Vanatta, 1896:330-331).

 

 

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