163* 



canal posteriori}' ; peritreme rather thin, reflected, outer part 

 whitish, within chestnut-colour ; umbilicus large, with a few 

 somewhat obsolete spiral strias, and bordered externally with a 

 single white line ; operculum rather thick, whitish, and paucispiral. 

 Madagascar. 



189. Cyclostoma Guayaquilense (Tab. Suppl. xxxi. b, f. 

 -'31 9), nobis. 



C. testa subgloboso-depressa, fulvescente, brunneo spiraliter 

 lineata ; spira subacuminata, brevi, apice obtusiusculo, rufescente ; 

 anfractibus quatuor, rotundatis; sutura" distincta; apertura circu- 

 lari, peritremate tenuiusculo ; umbilico magno, lsevi, lineis incre- 

 mentis tenerrimis solummodo conspicuis. 



Shell depressedly subglobose, of a dull fulvous colour, with 

 brown spiral lines ; spire slightly acuminated, short, with a rather 

 obtuse rufous apex; volutions four, rounded; suture distinct; 

 aperture circular ; peritreme thin ; umbilicus large, smooth, oidy 

 marked with extremely slender lines of growth. 



Guayaquil ; Belattre. Mus. Cuming. 



190. Cyclostoma Indicum (Tab. Suppl. xxxi. b, f. 320, 

 321), Beshaijes, Lam. Anim. sans vert. viii. p. 363. 



C. testa turbinato-conica, suborbiculari, subdepressa, fusca, 

 albo-rutilante marmorata ; spira brevi, subacuminata, apice ob- 

 tuso ; anfractibus 5-g-, convexis, liris spiralibus tribus vel quatuor 

 elevatis, striis tenuioribus interjectis ; ultimo anfractu ad periphe- 

 riam zona nigrescente cincto ; sutura distincta ; apertura circu- 

 lari, postice subcanalifera, intus alba, peritremate subincrassato, 

 revoluto, albido, nonnunquam subaurantiaco ; umbilico maximo, 

 margine subcarinato ; operculum tenue, corncum, anfractibus 

 septem ad octo. 



Shell of a rather depressed, suborbicular, conical, turbinate 

 form, and of a dark -brown colour, variously mottled with brownish- 

 white ; spire short, slightly acuminated, with an obtuse apex ; 

 volutions 5 -j, convex, with three or four slightly elevated spiral 

 lines, with slender intervening stride ; last volution with a dark- 

 brown, nearly black zone near the middle ; suture distinct ; aper- 

 ture circular, with a very slight channel posteriorly, white within ; 

 peritreme thickened, revolute, whitish, somewhat light orange- 

 brown ; umbilicus very large, slightly keeled at the outer edge ; 

 operculum thin, horny, with seven to eight volutions. 



Ceylon, Copt. Templeton. Mus. Cumin//. Madras, Mr. Benson. 

 Khasya Hills, Mr. Lear. 



