Schistoloma anostoma (Benson, 1852)
“In form much resembling C. altum of the Philippines, but shorter and more rapidly tapering from the base to the summit, differing also in tenuity, in the pale apex, the absence of a funiculate keel at the base, the more convex whorls, and the more coarsely striate ultimate volution. The penultimate whorl is not broader than the last, as it is in C. altum; at the same place where the channel occurs on the inner lip in that shell there appears a very slight indentation. The summit and succeeding whorl are white, as in C. guildingianum, Pfeiffer. Two slightly impressed lines traverse the last whorl spirally in the only specimen received through Dr. Bacon. They appear to be accidental, and have therefore been omitted in the specific description.” (Benson, 1852)
“Alcuni degli individui sopraindicati sono quasi incolori e translucidi, altri presentano alla base dell' ultimo giro due sottili linee bianche, spirali che accennano a due iascie rudimentari.” (Issel, 1874)
Benson (1852) original descriptions on Cyclostoma anostoma – “Testa perforata, turrita, tenui, exiliter striata, pallide castanea, apice acutiuscula albida; anfractibus septem convexis, ultimo antice bre viter ascendente, basi rotundato; apertura ampla, vix obliqua, leviter sursum spectante, subcirculari, fauce castanea, margine rufo; peristomate duplicato, tenui, interno continuo, subito expanso, exterao plane dilatato, praecipue ad partem columellarem, vix reflexiusculo.”
“Axis 23, diam. anfr. penult. 10, diam. apert. extern. 9, alt. apert. 7½ mill.” (Benson, 1852)
Type locality – “in Insula Borneo” (Benson, 1852)
Other locality – “Medesima località” leg. Doria and Beccari (Issel, 1874); “Trusan and Niah Hills” leg. A. Everett (Godwin-Austen, 1889)
Sarawak, MALAYSIA.