J54 



suture. Aperture, very oblique, approachiug to straight on the left, 

 and much expaadecl, especially above on the right. Peritreme, 

 slightly sinuate above. Umhilicus, narrow, greatest breadth O '24. 

 Umhilical keel, strongly produced witbiu, rather flat outside, conti- 

 nuous round the whorl. Operculum, rather concave and convex oa 

 the lower side betweeu the types of C. seminudus and C. Jatnaicensis ; 

 whorls 6, the margins rising higher before dilation than in C. semi- 

 nudus, and being much broader and rounder than m C. Jamaicensis. 

 Height 0-61, greatest breadth 0-88, least breadth 0-7. 



This shell has been distributed by Adams as a variety of C. varians. 



§IV. 



C. Jamaicensis, Chemn. See Cat. Phan. p. 13. 



I will only add to that description, that the opercuhim, though 

 generally planular, is sometimes very triflingly concave, and that the 

 lašt lamella vv^horl is wide apart from the edge. 



C. DENTiSTiGMATUs, Chitty. Yalkbs Hill and Portland. 



Form, depressed-conic. Colour, dark oHve brown, strong red-brown 

 at the apex and within the aperture. Scidpture, coarse hnes of 

 growth down to the lašt quarter of the penult whorl, thence coarse 

 corrugation till it becomes extremely coarse, wide and highly raised 

 at the back of the lašt whorl, and becomes obsolete at the back of the 

 aperture; belovv the periphery, smooth with about 14 deep eccentric 

 tooth-like indentations running up to the umhilical keel (thence the 

 name) ; lines of growth vvithin the umbilicus, not coarse. Spire, well 

 elevated, somewhat mammiform, with concave outlines. JT koris, 

 5į, much rounded with a deep suture, lašt very large and ventricose. 

 Aperture, rather oblique, dilated on the right side, large, red-brown 

 within. Peritreme, very sinuate above. Umbilicus, largely open and 

 funnel-shaped, greatest breadth 036. Umhilical keel, very prorai- 

 nent and wide. Operculum, planular above, lamina of 9 whorls rising 

 higher and much closer than in C. Jamaicensis, ■which it much re- 

 sembles otherwise ; below the margins, the lamina spreads out as in 

 C. semi7iudus, so as to touch each cousecutive whorl, and appear to be 

 appressed to the plane, but are de/ucto detached. Lašt whorl close 

 to the edge, rather concave below. Height 0-9, greatest breadth 1 • 13, 

 least breadth 0*9. 



This shell may be readily kuown by the tooth-marks which give 

 rise to its name. Its operculum and size distinguish it from 

 C. Novce-Spei. 



C. Novus-SALTUS, Chitty. New Forest. 



Form, depressed-conic. Colour, brown. Sculpture, throughout 

 fine somewhat close regular strise of growth, vphich give a silky 

 appearance. Spire, moderately elevated, with convex outlines. 

 JFhorls, 5i, well rounded, -mūi a deep suture. Aperture, circular, 

 notexpanded. Peritreme, simple. Umbilicus, greatest breadth 0*32. 

 Umbilical keel, almost obsolete, just visible. Operculum, concave 



