26 CYCLOPHORID^. 



Shells Br. India, 1876, p. 37 ; Kobelt & Mollendorff, Nachr. Deut3. 

 Malak. Ges. xxix, 1897, p. 87 ; id., Cat. Pneum. 1899, p. 15. 

 Bitropis (Ditropis) planorbis, Kobelt, Das Tierreich, Lief. 16, 1902, 

 p. 76, text-fig. 16 (p. 7-2). 



Original description: — "Testa latissime umbilicara, depressa, 

 discoidea, vitrea, tenuis, olivacea, glabx-a, obsolete striatula, polita. 

 Spira plana, nucleo non ex.serto, ssepe eroso, sutura impressa, at 

 anfractum ultimuni et supra et in umbilico costa siiblata intus mar- 

 ginata. Ant'r. -1-41, coiivexi ; ultiinus antice vix desceudeiis sub- 

 quadraugulai'is, supra atque subtus convexus, carinis duabus validis 

 circumdatus, una ad peripberiam, altera juxta basin ad latus 

 externum. UmbilicLis perspectivus, omnes anfraetus exbibens. 

 Apertura obliqua, sub-quadrata, intus albido-labiata ; peristoma 

 incrassatum, rectum, non-expansum. Operculum intus con- 

 vexum, extus concavum, marginibus anfractuuiu externorum 

 laciniatim elongatis. 



" Exempli majoris diam. maj. 84, min. 7, alt. 2, ap. diam. 

 1| millem. Exempli rainoris diam. maj. 7, miu. 5|, alt. 1|, ap. 

 diam. (fere) 1| millem. 



" Shell ver}' broadly umbilicated, depressed, discoidal, thin, 

 glassy, smooth and polished, with obsolete striation. Spire per- 

 fectly flat ; the apex not rising above the surface ; suture impressed ; 

 the nucleus is generally wanting, being apparently remarkably 

 liable to erosion. Whorls 4 to 4|, sliglitly convex above, the 

 last descending but sliglitly near the mouth, and nearly square, 

 with two keels, the one rather high up, forming the periphery of 

 the shell, the other at the outer side of the base; these keels can 

 be traced upon tlie penultimate and part of the aiite-penultimate 

 whorl, both on the spire and within the umbilicus, forming a 

 distinct rib inside the suture. Aperture oblique, nearly square, 

 with a white internal lip ; peristome thickened, all in one plane 

 and not expanded. Operculum convex and smooth inside, the 

 margins of the whorls externally much elongated and torn, 

 especially towards the margin. 



"Major diameter, from the edge of the peristome to the 

 opposite margin, 0"34 inch, minor diam. at right angles to the 

 other, 028, height 0*08. A smaller specimen measures 0'27 and 

 0*2 in the two diameters, and 0*05 in height." {Blanford.) 



Hah. India : Calcad Hills, Travancore, Tinnevelly {Beddome). 



Genus SCABRINA, Blanford. 



Scabrina, Blanford, J. A. S. B. xxxii, 18G3, p. 322 (as section of 

 Ci/clop/iorus) ; id., A. M. N. H. ser. 3, xiii, 1864, p. 452; Nevill, 

 Hand List, i, 1878, p. 277 (as subgenus); P. Fischer, Man. Conchyl. 

 1885, p. 744 (as section of Ci/clophorus, s. s. ) ; Kobelt & Mijllen- 

 dortf, Nacln-. Deuts. Malak. Ges. xxix, 1897, p. 88 (as genus); 

 id., Cat. Pneum. 1899, p. 16; Kobelt, Das Tierreich, Lief. 16, 

 1902, p. 87. 



Dasytherion, Mabille, Bull. Soc. Malac. France, iv, 1887, p. 140. 



Scahrinn.t, Sykes, Proc. Malac. Soc. iii, 1898, p. 73 (as subgenus). 



Type, Cyclophorus calyx, Benson. 



