CASSIDEA. 99 



whorls few ; peritreme reflected ; columella contiguous to the 

 axis; epidermis thin. — Obs. This genus differing from Helix only 

 in the whorls being angulated, is hardly distinct enough from the 

 latter to justify the separation In De Ferrusac's system these 

 species constitute the division Helicigona, of the genus Helix. 

 C. Lamarckii, fig. 277. East and West Indies, Philippines, South 

 America and Europe. 



CARTILAGE. See Ligament. 



CARYCHIUM. Mull. Fam. Auriculacea, Bl. Colimacea, Lam.— 

 Descr. Oblong or cylindrical, with gradually increasing whorls, 

 few in number ; aperture straight, short, with a fold on the 

 columella.— Obs. This genus of minute land shells differs from 

 Auricula chiefly in the soft parts. De Furrusac enumerates three 

 species, C. Lineatum, C. Corticaria, (Odostomia, Flem.) and C. 

 Minimum, fig. 301. De Blainville places it in his genus Auricula, 

 as " species with two folds and a posterior tooth on the columella," 

 giving a figure of A. Mysotis as his example, and quoting the 

 name Phitia, Gray. Europe. 



CASSIDARIA. Lam. (From Cassis) Fam. Purpurifera, Lam. 

 Entomostomata, Bl. — Descr. Oval, ventricose, spirally grooved 

 and tuberculated, with a short turrited spire and a large aperture, 

 terminating anteriorly in a recurved canal ; outer lip thickened, 

 reflected, undulated or denticulated ; inner lip expanded over a 

 part of the body whorl and the columella, with part of its lower 

 edge free. — Obs. The recent species of this genus are not nume- 

 rous; the few fossil species occur in the tertiary strata. C. 

 carinata is found in Calc-grossier and London Clay. In general 

 form this resembles Cassis, but is at once distinguished by the 

 canal, which does not turn abruptly back, but is slightly curved 

 upwards. Oniscia (C. Oniscus, &c. Lam.) is distinguished by the 

 shortness of the canal, and the granulated surface of the inner lip. 

 Fig. 407 . C. Echinophora. Mediterranean. 



CASSIDEA. Sw. (from Cassis.) A genus composed of those 

 species of the genus Cassis, Auct. which have the "aperture 

 wide ; outer lip never broad or flattened, but sometimes slightly 

 inflected ; inner lip spreading, but never dilated or detached 



h 2 



