146 



umbilico magno ; operculo spiral!, 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 broad 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, pyramidaii, apice decollato; 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 striae; 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 1 have noticed the 

 distinguishing marks. From Jamaica, Lam. 



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

 Cistula scabrosa, Humphrey, M.S. 



T. cylindraceo-subpyramidali, apice decollato ; anfractibus 

 4 — 7j subventricosis, decussatis, sca])ris, margine superiori 

 crenulato ; sutura distincta ; apertura elliptica, superne angu- 

 lata, peritremate disjuncto, reflexo, angustiori, umbilico 

 mininio. 



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. CHLOROSTOMA. (pi. xxviii. f. 168.) nob. 



T. cylindraceo-pyramidali, nigricante, apice decollato ; 

 anfractibus quinque, ventricosis, decussatis ; sutura distincta; 

 apertura circulari ; peritremate continuo, reflexo-patente, 

 flavo ; umbilico minori. 



