132 



striatis ; sutura profunda, apertura circulari ; peritremate 

 duplici, interno subreflexo ; externo late expanse ; umbilico 

 magno. 



Shell globosely conoidal, very thin, slightly hyaline, whitisli ; 

 apex truncated; volutions 4, rounded, and very delicately 

 transversely striated, with a deep suture ; aperture circular ; 

 peritreme double, inner slightly reflected, outer widely spread, 

 thin ; umbilicus large. 



117. C. PULCHRUM. (pi. xxvii. f. 143. 144.) Gray, m 

 Supp. to Wood's Ind. Testae. 



T. suborbiculari, spira conoidali, apice mamillari (plerumque 

 decollato) anfractibus 3 — 5, ventricosis, rotundatis, spiraliter 

 carinatis, et transversim striatis ; sutura profunda ; apertura 

 circulari ; peritremate duphci, interno tenui, elevatiusculo^ 

 externo lato, reflexo, unduiato ; umbilico magno, spiraliter 

 carinato et transversim striato. 



Shell nearly orbicular, with a rather short conical spire, the 

 apex of which is mamillated, it is, however, generally decolla- 

 ted ; volutions 3 — 5,(3 when decollated, 5 when complete) 

 ventricose, rounded, with 8 or 10 spiral keels, and transversely 

 striated ; suture deep ; aperture circular, with a double peri- 

 treme, the inner of which is thin and slightly elevated, the 

 outer broad, reflected, and imdulated, each undulation forms 

 at the back the continuation of one of the spiral keels, and the 

 beautiful fringe or ruflie formed by this undulated peritreme, 

 is concentrically striated. The whole shell is of a fawn colour, 

 Avith dark marks arranged in rows above and below the spiral 

 keels ; these keels are only distinct on the two last volutions. 

 That side of the reflected peritreme which is towards the last 

 volution, is spread over it a little. Jamaica. 



118. C. FiMBRiATULUM. (pi. xxviii. f- 145, 146.) Soic. 

 in Tank. Cat. App. p. viii. no. 1015. 



T. globoso-conoidea, albida, spira breviuscula, decoUata : 

 anfractibus 4 — 5, rotundatis, spiraliter sulcatis, sulcis confer- 

 tissime decussatis, asperis ; sutura profvmda ; apertura circu-, 

 lari; peritremate duplici, interno simplicissimo, externo late 

 expanso, unduiato ; umbilico magno ; operculo testaceo, 

 spirali, anfractibus intiis leevibus, extus lamella spirali reflexa. 



Shell globosely conical, whitish, with a rather short decolla- 

 ted spire, consisting of from 4 to 5 rounded, spirally grooved 

 volutions, rough, with very close-set decussated striae ; suture 

 deep ; aperture circular, peritreme double, the inner one very 

 simple, the outer one broadly expanded and undulated : 



