354 CTCLOPHORID-i:. 



spurco-albida, late umbilicata, longitudiiialiter striata ; spira brevi, 

 acuta ; anfractibus convexis ; apertiira patula, rotuiidata ; labro 

 simplici acuto. 



" Quoique cette coquille ressemble a une llelice, c'est un veritable 

 Cyclostome, puisque son peristome est continu ; sa coiileur est 

 d'uii blanc sale: sa surface parait lisse, luais examinee attentive- 

 ment on y decouvre des scries longitudinales, tres fines, ti-es serrees, 

 et tres regulieres. L'oinbilic est assez large et profond. L'ouverture 

 est gfaude, arrondie, dilatee et relevee ; les bords sont simples et 

 tranchants. La spire est courte et acuDiinee, a I'evolutions con- 

 vexes." (^GrateJoup.) 



Height 15, diam. 20 mill. 



Ilah. India : Bombay. 



This meagre description by Grateloup has been amplified by 

 Pfeiffer in 1858 {J. c), from a specimen iu the Cuming collection, 

 as follows : — 



"T. umbilicata, depressiusculo-turbiuata, solida, confertim 

 striatula, nitidula, lutescenti-albida ; spira turbinata, apice acuti- 

 uscula; anfr. 5 convexi, rapide accresceutus, nltimus rotuiidatus ; 

 umbilicus conicus -^ diametri occupans ; aperlura parum obliqua, 

 rotuudato-ovalis, superne subaugulata ; perist. rectum, acutum, 

 marginibus approximatis, columellari subincrassato, expansi- 

 usculo — .Operc. ? 



"Diam. maj. 18, min. 15, alt. 11 uiill. Ap. 9 mill, longa, 

 8 lata." 



o4G. Cyclotopsis subdiscoidea, Soioerly. 



Ci/closto77ia suhdiscoideum, Sowerby, Thes. Conch, i, 1S50, p. 161*, 



pi. 31 Z», fius. 304, .305; Pfeiffer, Conch.-Cab.j Cyclostomaceea, 



1854, p. 318, pi. 41, figs. 33, 34. 

 Cyclotus subdiscuideus, Pfeiffer, Zeits. Malak. viii, 1851, p. 134 ; 



id.. Men. Pneum. 1852, p. 31 ; id., Cat. Plianeropn. Brit. Mus. 



1852, p. 17; Adams, Gen. Rec. Moll, ii, 1855, p. 275 ; Reeve, 



Conch. Icou. XIV, 1863, Cychtus, pi. 4, fig. 21 : Ilauley & 



Theobald, Conch. lud. 1876, p. xiv, p. 2. 

 Cyclotopsis suhdiscoidcus, Pfeiffer, Men. Pneum. Siippl. 2, 1805, 



p. 112 ; Theubald, Cat. Shells Brit. India, 1876, p. 35. 

 Cyclostoma {Cyclotojjsis) subdiscoideuin, Nevill, Hand List, i, 1878, 



' p. 308. 

 Cyclotopsis subdiscoidea, Kobelt & Mollendorff, Nachr. Deuts. 



Malak. Gea. xxx, 1898, p. 157; id.. Cat. Pneum. 1899, p. 77. 

 Cyciostomaaratum, Benson, A. M. N. H. ser. 2, viii, 1851, p. 190. 

 Ci/< lotus aratus, Pfeiffer, Zeits. Malak. viii, 1851, p. 134 ; id., Mou. 



'Pneum. 1852, p. 31. 

 Cyclostoma rusticum, Pfeiffer, Proc. Zool. See. 1851, p. 250. 

 Cyclotifs jifeifferi, Gray, Nomencl. Moll. Brit. Mus. part 1, 1850, 



p. 9 (nom. nud.). 



Original description: — " Shell suborbicular,ratlier discoid, spirally 

 grooved, whitish, -with an interrupted zone of a pale brownisli 

 colour ; spire depressedly conical, obtuse; volutions, four, rour.ded; 



