original description
Smith, E. A. (1879). On a collection of marine shells from the Andaman Islands. <em>Proceedings of the Zoological Society of London.</em> 1878: 804-821, pl. 50., available online at https://www.biodiversitylibrary.org/page/28519502
page(s): 817-818, pl. 50, fig. 20. [details]
additional source
Tryon, G. W. (1886). <i>Manual of conchology, structural and systematic, with illustrations of the species</i>, ser. 1, vol. 8: Naticidae, Calyptraeidae, Turritellidae, Vermetidae, Caecidae, Eulimidae, Turbonillidae, Pyramidellidae. pp 1-461, pls 1-79. Philadelphia, published by the author. [pp. 1-64, pls 1-27, Jan. 23, 1886; pp. 65-128, pls 28-37, May 3, 1886; pp. 129-192, pls 38-58, Jul. 28, 1886; pp. 193-461, pls 59-79, Nov. 24, 1886]. , available online at http://www.biodiversitylibrary.org/item/63144
page(s): p. 203, pl. 63, fig. 89 [details]
From editor or global species database
Type material 1 sample, syntypes, NHMUK 1878.6.8.7, containing 3 specimens. Early whorls single-keeled, later two keels decreasing in prominence whilst sculpture of fine striae becomes stronger. Whorls gradually more convex. [details]