155 



above ; spiral lamina of 7 whorls rising as in C. Jamaicensis, but 

 much narrower at the margins, which are deflected and expanded 

 on to the plane as in C. dentistigtnatus, but do not quite so closely 

 approach the consecutive whorl. Height - 76, greatest breadth 0*97, 

 least breadth 0*77. 



C. crassus, Ad. See Cat. Phan., p. 16. 



C. inutilis, Chitty. (Unique.) 



Form, much depressed-conic. Colour, light brown ; apex red- 

 brown. Sculpture, fine lines of growth on the 3| whorls, thence 

 (for its size) roughly corrugated, except the last quarter of last 

 whorl, where, above, lines of growth are strong, with slight pitting ; 

 lines of growth fine within the umbilicus. Spire, much depressed, 

 with couvex outlines. Whorls, 4, well rounded, with very deep 

 suture. Aperture, oblique from left to right below, dilated above 

 and much expanded to the right, horizontally elliptical, 0*22 across, 

 02 vertically. Peritreme, rather sinuate above, and detached from 

 the penult whorl. Umbilicus, open and large, greatest breadth 0*14. 

 Umbilical keel, well defined inside umbilicus. Operculum, of C. Ja- 

 maicensis type, concave exteriorly, with lamella of 5 whorls, like 

 C. crassus. Height 0*31, greatest breadth 0'46, least breadth 0*35. 



C. rupis-fontis, Chitty. Rock Spring, Hanover. 



Form, globose-conic, very thick and substantial. Colour, deep red- 

 brown, with a broad band of dingy yellow next below the suture on 

 the penult whorl, lighter behind the aperture, red at the apex, light 

 brown at the periphery, and bluish-white inside the aperture. 

 Sculpture, fine lines of growth, with a slight corrugation and slight 

 pitting below the suture on the last whorl ; lines of growth fine 

 within the umbilicus, somewhat pitted close to the exterior of the 

 umbilical keel. Spire, well raised, with convex outlines. Whorls, 

 5 \, well rounded with deep suture ; last slightly depressed above. 

 Aperture, slightly expanded on the right. Peritreme, very much 

 thickened, slightly sinuate above. Umbilicus, moderately open, 

 greatest breadth 0*22, funnel-shaped. Umbilical keel, strongly 

 and broadly produced outside and inside. Operculum, planular below 

 and above, plane plain or smooth, lamina with 6 whorls rising high 

 and vertically to the plane exteriorly, thickened at the base and 

 rising with a slight outward slope, so as to make the margin com- 

 paratively sharp ; termination of the last whorl sharp ; last whorl 

 distant from the upraised edge of the plane. Height 0.79, greatest 

 breadth 099, least breadth - 75. 



C. corrtjgatissimus, Chitty. 



Form, depressed-conic. Colour, brown. Sculpture, 3 and f rds of 

 upper whorls fine lines of growth, thence very much and very 

 coarsely corrugated above and below in zigzag form to close behind 



