Description
Author: Jan Delsing
Text ID: 122619
Text Type: 1
Page: 0
Created: 2023-04-12 16:48:22 - User Delsing Jan
Language: EN
Text function: [[t:1164027,textblock=122619,elang=EN;Description]]
Shell small, white. Nucleus consisting of at least one whorl, which appears to be smooth. (In our specimens this is somewhat worn.) Post-nuclear whorls, well rounded, separated by a well impressed suture, marked by strong, low, rounded, retractive axial ribs, which are not quite as broad as the spaces that separate them. Of these ribs, about 12 occur upon all the whorls. These ribs disappear shortly after passing over the periphery of the base. In addition to the axial ribs, the surface of the shell is marked by numerous, fine lines of growth. The spiral sculpture consists of well-developed cords, which are about half as wide as the spaces that separate them. Of these cords, 4 occur between the sutures on the first turn, 5 upon the second, 6 upon the third and 7 upon the penultimate whorl. Base marked by about 15 spiral cords, which equal those on the spire in strength and spacing. Aperture moderately large; posterior angle obtuse, scarcely channeled; outer lip thin, rendered slightly sinuous by the spiral cords on the outside; columella and parietal wall covered with, a thin callus.
The type and another specimen, Cat. No. 249734, U.S.N.M., come from Port Alfred (Coll. No. 1006). The type has five postnuclear whorls and measures: Length, 7.4 mm.; diameter, 3.1 mm.
Bartsch, P., 1915. Report on the Turton Collection of South African marine mollusks, with additional notes on other South African shells contained in the United States National Museum.