Popis
Autor: Jan Delsing
Text ID: 111504
Text Type: 1
Page: 0
Založeno: 06.10.2021 17:03:01 - Uživatel Delsing Jan
Language: EN
Odkazová funkce: [[t:1753742,textblock=111504,elang=EN;Popis]]
Shell very minute, slender, elongate-conic, translucent. Nuclear whorls a little more than two, somewhat inflated, smooth. Post-nuclear whorls well rounded, appressed at the summit, marked by almost vertical, somewhat sinuous axial riblets, of which 18 occur upon the first, 22 upon the second and third, 24 upon the fourth and fifth, and 26 upon the penultimate turn. These riblets are about one-half as wide as the spaces that separate them. Intercostal spaces crossed by slender spiral threads, of which about 15 occur between the sutures on the later whorls. Periphery of the last whorl well rounded. Base moderately prolonged, well rounded, marked posteriorly by the feeble continuations of the axial ribs, which vanish before crossing half of the base, and numerous, very fine, incised, spiralstriatums. Aperture broadly oval; posterior angle obtuse; outer hp thin, showing the external sculpture within; inner lip thin and slightly reflected.
The type, Cat. No. 249703, U.S.N.M., comes from Port Alfred (Coll. No. 975). It has six and a half postnuclear whorls and measures: Length, 2.3 mm.; diameter, 0.5 mm. Cat. No. 249708, U.S.N.M. (Coll. No. 980), contains one specimen from Port Alfred.
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.