153 



Of the largest specimen Aeight 0.71, greatest breadth 0-82, least 



^ 1 breadth 0"65, 



Of the medium size /teight 0-51, greatest breadth 0-67, least 



\ breadth 0*53. 

 Of the smallest size . /^^eight 0-34, greatest breadth 0-45, least 

 ' * I breadth 0-35. 



C. PRETiosus, Chitty. New Hope. 



/'om, depressed-conic. CoZoMr, middling light rich brown. Sculp- 

 ture, Ist, 2nd and 3rd and iwhorls (except the nuclear apex) very 

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

 growth ; the ręst, finely diamond-cut above and below, except the lašt 

 third of the lašt whorl, which is smooth, with fine Unes of grovvth, 

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

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

 TFhorls, 41 well rounded, with a deep suture, lašt whorl much ex- 

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

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

 usual angle) 0-24. Feritreme, very slightly sinuate above, much 

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

 Umbilical keel, moderately developedfar little more than half a whorl. 

 Operculum, hke C. rudis-planusąue, but with 4 whorls only, and the 

 outer one is in proportion further from the edge. Height 0-41, 

 greatest breadth 0'56, 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 keeį yellow- 

 ish at the suture on the lašt whorl. Sculpture, fine hnes of growth 

 on the upper whorls and fine corrugation on the penult and lašt ; 

 moderately coarse lines of gTowth within the umbilicus. Spi7-e, well 

 elevated, with convex outhnes. TVhorh, 5, well rounded, with deep 

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

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

 Umbilicus, nairovr, greatest breadth 0-2. Operculum, hke C. seminu- 

 dus, but with only 4 whorls, the lašt 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 0-57. 



C. RUBER, Chitty. Westmoreland. 



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

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

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

 the lašt 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 Unes of growth within the umbilicus. Spire, not 

 much elevated: convex outhnes. TFhorls, 5, well rounded, deep 



