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.”
Morelet (1861) original description on Cyclostoma leferi – “T. subperforata, pyramidata, tenuis, striatula, nitida, sericea, castaneo-rubella; spira turrita, apice truncatula; anfr. superst. 5 convexiusculi, ultimus basi rotundatus, antice leviter planatus; apertura rotundo-campanulata, concolor; peristoma duplex: internum continuum, expansum, repandùm; externum superne lateraliter et breviter dilatatum. Operculum tenue, planulatum, corneo-lutescens, spira subindistincta, nucleo ccntrali.”
Kobelt (1902) descriptions on Schistoloma anostoma – “Schale eng genabelt, getürmt, dünn, fein gestreift, blass kastanienbraun; Apex ziemlich spitz, weisslich; 7 gewölbte Windungen, letzte vorn kurz ansteigend, unten abgerundet; Mündung weit, kaum schräg, leicht nach oben gerichtet, fast kreisrund, im Gaumen kastanienbraun mit rotem Saum: Mundrand dünn, doppelt: innerer zusammenhängend, plötzlich ausgebreitet, äusserer flach ausgebreitet, besonders an der Spindel, kaum zurückgeschlagen.”
Kobelt (1902) descriptions on Schistoloma leferi – “Schale fast genabelt, kegelförmig, dünn, gestreift, seidenglänzend, rotbraun; Gewinde getürmt, oben abgestutzt; 5 leicht gewölbte Windungen, letzte unten abgerundet, vorn leicht abgeflacht; Mündung kreisrund, glockenförmig erweitert, gleichfarbig; Mundrand doppelt: innerer zusammenhängend, ausgebreitet, rückwärts gerichtet, äusserer oben rechts etwas verbreitert. Deckel dünn, flach, horngelb, Windungen ziemlich deutlich, Nucleus in der Mitte.”
Reeve (1878) descriptions on Megalomastoma lowei – “Shell rather short, pyramidal, purple-brown; apex acuminated; whorls seven, gradually increased, rather convex, last keeled at the umbilicus; aperture round, margin duplicate, expanded, orange within, white without, rather flattened.”
Cyclostoma anostoma – “Axis 23, diam. anfr. penult. 10, diam. apert. extern. 9, alt. apert. 7½ mill.” (Benson, 1852); Cyclostoma leferi – “Long. 21, diam, 9 mill.” (Morelet, 1861); Schistoloma anostoma – “H. 23. Durchm. 10 mm.” (Kobelt, 1902); Schistoloma leferi – “H. 21, Durchm. 9 mm.” (Kobelt, 1902)
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)