CAROCOLLA. Auct. _Fam._ Colimacea, Lam.--_Descr._ Orbicular, depressed, with the outer sides of the whorls angulated or 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. CARTILAGE. See LIGAMENT. CARYCHIUM. Müll. _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 numerous; 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 beyond the base into a prominent rim." East Indies. Ex. C. Glauca, fig. 411. CASSIDULA. Humph. PYRULA, Auct. CASSIDULINA. D'Orbigny. A genus of microscopic Foraminifera.