96 



of Lam. from which it is, however, very distinct. Its oper- 

 culum is remarkably neat. Jamaica. 



15. Jamaicense. (pi. xxiii. f. 12, 13.) Gray in Wood's 

 Svpp. tolnd. Test. t. 6,/. 3 . Turbo Jamaicensis, Chemn. 



T. orbiculato-subconica, crassiuscula, plerumque pallida, 

 epidermide fusca, induta, anfractibus 4 — 5, rotundatis, trans- 

 versim tenuissime striatis, superne corrugatis, prope suturam 

 elevatiusculis ; sutura distincta ; apertura circulari, subeffusa, 

 superne angulata, et in canalem brevissimam, inconspicuam, 

 desinente; peritremate subincrassato, margine externo acutius- 

 culo, interne incrassato, obtuso ; umbilico magno, margine 

 carinato, intus transversim striato; carina umbilicali extus 

 corrugata ; operculo testaceo, extus lamina elevata, convoluta, 

 obtusa, intus corneo. 



Shell of a rather conical orbicular form, thickish, generally 

 of a pale colour, covered with a dark brown epidermis ; 

 volutions 4 — 5, rounded, very finely transversely striated^ 

 corrugated on the upper part, and rather raised next to 

 the suture ; suture distinct, but not deeply marked ; aper- 

 ture circular, somewhat spreading, angular at the upper part, 

 where it forms a very short and inconspicuous canal, peritreme 

 slightly thickened, its outer margin rather sharp, its umbilical 

 edge thickened and blunt ; umbilicus large, and transversely 

 striated within, strongly keeled at the edge, corrugated out- 

 side of the keel ; operculum shelly, with a raised, convoluted, 

 obtusely-edged lamina outside, and appearing horny and 

 shining within. Common in Jamaica : it is distinguished 

 from C. corrugatum by the umbilicus being surrounded by a 

 strongly marked keel, and by the lamina outside the opercu- 

 lum having its edge reflected. 



16. C. FiLosuM. (pi. xxiii. f. 14.) Beechey, t. 38. f. 31. 

 T. orbiculato-subconica, crassiuscula, pallida, anfractibus 



5, rotundatis, longitudinaliter striatis et carinatis, carinis 

 duabis majoribus fusco-articulatis, inferiore suturali : sutura 

 minime distincta ; apertura circulari, peritremate sub-incras- 

 sato, superne sinuato, et subangulato, in canalem brevissi- 

 mam inconspicuam desinente, margine obtusiusculo ; um- 

 bilico magno, margine carinis duabus, intus profunde striato. 

 Shell of a somewhat conical orbicular form, its spire rather 

 shorter than the aperture, thickish, of a pale colour, volutions 

 5, rounded, longitudinally striated and carinated, the two 

 more prominent keels speckled with reddish l)rown, the lower 

 one running along the suture, which is otherwise very indis- 



