CAS SIDE A. 101 



keeled, 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. PL xiii. fig. 277. 



CARTILAGE. See Ligamekt. 



CAHTCHIUM. Miiller, 1774. Fam. Auriculacea, Bl. Colimacea, 

 Lam.— Deser. 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 Ferrusac enume- 

 rates three species, C. Lineatum, C. Corticaria, (Odostomia, 

 Elem.) 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. PI. xiv. 

 fig. 301. 



CASSIDAEIA. Lam. 1812. Should be Moeio. Montf. 1810, on 

 the ground of priority. (Prom 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. cari- 

 nata 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. C. Echinophora. Mediterranean. PI. xix. fig. 407, 

 408. 

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



