Cerion (Strophiops) mcleani Clench, 1937

Original Description

Cerion (Strophiops) mcleani, new species. Plate 3, fig. 7.

Description. Shell narrow, rather coarsely ribbed, cylindrical, small, solid and generally minutely perforate. Color a flat white. Whorls 9½ to 10, slightly convex, and gradually tapering above the fourth whorl to the summit. Spire slightly convex, produced at an angle from 46° to 56°. Aperture subquadrate, holostro­matous in fully adult shells owing to the produced parietal ridge. Parietal tooth strongly developed but not extending a great dis­tance within. Columellar tooth obsolete or indicated by a very slight and somewhat broad, thickened area. The interior of the aperture colored a pale brown. Umbilical perforation small, with no definite ridge around the base. Lip flaring, slightly thickened and only very slightly turned back, connected along the parietal wall by a well elevated ridge. Sculpture of rather coarse ribs, most strongly developed on the body whorl, varying from 12 to 16, with many irregular growth lines both between and on the ribs. No spiral sculpture indicated. Suture fine, not im­pressed but indicated by the contour of the whorls. Nuclear whorls glass-like, opaque and smooth. Length 21; width 8; aper­ture 4.5 x 3.5 mm. (holotype). Length 19.8; width 7.6; aperture 4 x 3 mm. (average of 4 specimens).

Holotype. Mus. Comp. Zoöl. No. 112701, one mile East of O'Neills, Long Island, Bahama Islands. Russell, McLean, Hunt­ington and Foster collectors, July, 1936.

Remarks. A remarkably well differentiated species, totally different from any hitherto obtained in the Bahamas. As with malonei, it represents a sharply divergent line of evolution from the normal type of the group assemblage in which it is included. It is a member of the gubernatorium group as outlined by Pilsbry (Man. of Conch. (2),14, p. 240, 1902) and perhaps nearest to C. eleutherae P. & V. of southern Eleuthera Island." (Clench, 1937:22)

Close Window