151 



169. C. TORTUM. (pi. xxviii. f. 181, 182.) Gray, in Supp. 

 to Wood's Index Testaceologicus. t. 6. f. 32. 



T. oblongo-ovali, crassiuscula, Isevi, apice decollate; 

 anfractibus 5 — 6, rotundatis, raptim crescentibus, substriatis; 

 apertura circulari ; peritremate incrassato, reflexo, latere 

 anfractus ultimi tenuiori ; umbilico parvo. 



Shell of an oblong oval shape, thickish, smooth, with a 

 decollated apex; volutions from five to six, rounded, rapidly 

 increasing in width, slightly striated; aperture circular, 

 ]ieritreme thickened, reflected, thinner on the side next to the 

 last volution ; umbilicus small. West Indies. 



1/0. C. VENTRicosuM. (pi. xxviii. f. 183—184.) lyOrb. 



T. oblongo-ovali, crassa, laevi, apice decollate, anfractibus 

 quinque rotundatis, rapide crescentibus, transversim tener- 

 rime striatis, penultimo maximo ; apertura circulari, peritre- 

 mate incrassato, reflexo, latere anfractus ultimi angustiori, 

 postice angulato, latere umbilicali subexpanso ; umbilici pand 

 margine externo obtuse angulato ; operculo multispirali, 

 margine anfractuum sublamellari. 



Shell of an oblong-oval shape, thick, smooth, decollated 

 when full grown, with five somewhat rounded volutions, 

 increasing rapidly and very finely transversely striated ; the 

 last but one being the largest ; aperture circular, with a 

 thickened and reflected peritreme, narrower on the side of the 

 last volution ; angular posteriorly and with the umbilical side 

 rather spread : umbilicus small, its external margin obtusely 

 angular ; operculum multispiral, with the edge of its volutions 

 slightly lamellar. Cuba, D'Orbigny. 



1/1. C. AURICULATUM. lyOvb. (pi. XXxi. f. 277.) C. 



bicolor Gould. 



T. oblongo-pyramidali, ventricosiuscula, crassa, spires apice 

 obtuso, anfractibus 4 — 6, sub rotundatis, primis pallescentibus, 

 duobus ultimis castaneis, transversim, subundulatim, striatis; 

 apertura circulari, peritremateexternoincrassato,reflexo,postice 

 inangulum obtusum desinente, deinde,umbilicum versus tenui, 

 demiim supra umbilicum lamellaripatente; umbilico mediocri, 

 margine obtuse angulato. 



Shell oblong, pyramidal, rather ventricose, thick ; apex of 

 the spire obtuse; volutions 4 — 6, rather rounded, the first 

 2 — 3 pale, and the two last chesnut coloured, with slightly 

 undulated transverse striae ; aperture circular, outer peritreme 

 thickened, reflected, passing off"into an obtuse angle posteriorly, 

 then thin toward the umbilicus, and at length somewhat 



