153 



^p,, , . f height 0.71, greatest breadth 0*82, least 



Of the largest specimen j breadth 0' 65. 



nc ,, ,. . f height 0*51, greatest breadth - 67, least 



Ur the medium size. . . . < ,° ,., n c °, 

 [ breadth 0\53. 



nfti, li -t • /height 0-34, greatest breadth 0*45, least 



breadth 0'3o. 



C. pretiosus, Chitty. New Hope. 



Form, depressed-conic. Colour, middling light rich brown. Sculp- 

 ture, 1st, 2ad and 3rd and ^whorls (except the nuclear apex) very 

 fine, gradually growing very strong and prominent, vertical lines of 

 growth ; the rest, finely diamond-cut above and below, except the last 

 third of the last whorl, which is smooth, with fine lines of growth, 

 and sometimes diamond-cut below. Lines of growth coarse within 

 the umbilicus. Spire, much depressed, with scarcely convex outlines. 

 Whorls, 41, well rounded, with a deep suture, last whorl much ex- 

 panded at the aperture on the right and below. Aperture, much 

 detached from penult whorl, well rounded, width and height (into the 

 usual angle) - 24. Peritreme, very slightly sinuate above, much 

 thickened in mature shells. Umbilicus, wide, greatest breadth 0*15. 

 Umbilical keel, moderately developed for little more than half a whorl. 

 Operculum, like C. rudis-planusque, but with 4 whorls only, and the 

 outer one is in proportion further from the edge. '"Height 0*41, 

 greatest breadth - 56, least breadth 0'45. 



C. Bairdianus, Chitty. 



Form, globose-conic. Colour, rich red-brown, with^sometimes-a 

 lighter band at the periphery and round the umbilical keel, yellow- \ 

 ish at the suture on the last whorl. Sculpture, fine lines of growth; 

 on the upper whorls and fine corrugation on the penult and? last; 

 moderately coarse lines of growth within the umbilicus. Spire, well 

 elevated, with convex outlines. Whorls, 5, well rounded, with deep" 

 suture. Aperture, much expanded to the left, pyriform. Peri- 

 treme, rather sinuate above, much projecting at the usual angle. 

 Umbilicus, narrow, greatest breadth 0*2. Operculum, like C. seminu- 

 dus, but with only 4 whorls, the last rising higher, further from the 

 edge, and spreading more widely than any of this class of opercula, 

 so as almost to form a concave surface, except towards the centre. 

 Height 0-57, greatest breadth 0'65, least breadth - 57. 



C. ruber, Chitty. Westmoreland. 



Form, depressed-conic. Colour, very red-brown, especially red on 

 the apex and internally, with a somewhat lighter band at the peri- 

 phery and round the umbilicus, slightly yellow below the suture on 

 the last whorl. Sculpture, very fine lines of growth on the first 3 

 whorls, and then coarser and coarser, yet fine diamond-cutting 

 throughout ; corrugated also below the suture just behind the 

 aperture, and very much where the peritreme and umbilical keel 

 meet ; coarse lines of growth within the umbilicus. Spire, not 

 much elevated : convex outlines. Whorls, 5, well rounded, deep 



