146 



umbilico magno ; operculo spirali, tenui, anfractibus 5, extus 

 lamina lata trivoluta conspicua. 



Shell oblong, pyramidal, thin, pellucid, whitish, with inter- 

 rupted fuscous bands, spire somewhat acuminated, but obtuse 

 and generally decollated ; volutions 4 — 7, (4 when decollated, 

 7 when entire) rounded and transversely striated ; aperture 

 circular, with a wide spreading, and much reflected peritreme ; 

 umbilicus large ; operculum spiral, thin, with 5 volutions, and 

 having externally a broacl spiral lamina of three whorls. At 

 the upper part of the volutions of this shell there is a strongly 

 marked brown band, with distinct whitish articulations. 



From Demerara, G. C. Bainbridge, Esq. 



154. C. Labeo. (pi. xxviii. f. 165.) Lam. Anim. s. Vert, 

 vi. 2. p. 145. 



T. oblonga, pyramidali, apice decollate ; anfractibus 4, 

 rotundatis, subfuscis, decussatim striatis ; apertura elliptica ; 

 peritremate albo, reflexo, latiusculo ; umbilico mediocri. 



Shell oblong, pyramidal, with a decollated apex ; volutions 

 4, rounded, of a brownish colour, and covered with decussa- 

 ting striee ; aperture elliptical, with a broad white reflected 

 peritreme ; umbilicus rather small. This is one of the largest 

 of the pyramidal species, being equal in size to C. subasperum, 

 to which it bears a general resemblance, and which has been 

 confounded with it. Under that species I have noticed the 

 distinguishing marks. From Jamaica, Lam. 



155. C. bugulosum, (pi. xxviii. f. 166. 167.) Pfeiffer. 

 Cistula scabrosa, Humphrey, M.S. 



T. cylindraceo-subpyramidali, apice decollate ; anfractibus 

 4 — 7? subventricosis, decussatis, scabris, margine superiori 

 crenulato ; sutura distincta ; apertura elliptica, superne angu- 

 lata, peritremate disjuncto, reflexo, angustiori, umbilico 

 minimo. 



Shell rather pyramidally cylindrical, generally decollated at 

 the apex, with from 4 to 7 volutions, (4 when decollated, 7 

 when entire) rather ventricose, decussated, rough, with their 

 upper edges decollated ; suture distinct ; aperture elliptical, 

 angular at the upper part; peritreme narrow, reflected, 

 separated from the last volution ; umbilicus very small. 



From Providence Island and Cuba. 



156. C. ciilorostoma. (pi. xxviii. f. 168.) nob. 



T. cylindraceo-pyramidali, nigricante, apice decollate : 

 anfractibus quinque, ventricosis, decussatis ; sutura distincta; 

 apertura circulari ; peritremate continuo, reflexo-patente, 

 flavo ; umbilico minori. 



