CASSIDARIA. 19 
CARINA’RIA. Lam. Class. Cephalopoda. Division. Mono- 
thalamia, Lam. Fam. Nectopoda, Bl. Deser. Symmetrical, 
or nearly so, conical, thin, glassy, fragile, patelliform; with a 
fimbriated dorsal keel; apex convolute, bent forwards; aper- 
ture oval, pointed at the dorsal extremity. Hab. Amboyna and 
Mediterranean sea. Obs. A most singular and beautiful shell, 
remarkable for its transparency, its fragile structure, and the 
dorsal keel, whence it derives its name. It was once so rare that a 
specimen would realize one hundred guineas. Fig. 488. C. Me- 
diterranea. 
CA’RINATED. (From Carina, a keel.) Applied to any shell 
having a raised, thin ledge, passing round a whorl, or any other 
part of the shell, as Carinaria, fig. 488. 
CARINEL'LA. Adanson. Lutraria compressa, Lam. Lrevura, 
Montéf. 
CAROCOLULA. Lam. Fam. Colimacea, Lam. Deser. Orbi- 
cular, 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 Ferus- 
sac’s system these species constitute the division Helicigona, of 
the genus Helix. C. Lamarckii, fig. 277. 
CAR’TILAGE. See Ligament. 
CARY’CHIUM. Mill. 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 Ferussac 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. 
CASSIDARTA. Lam. (From Cassis.) Fam. Purpurifera, Lam. 
Entomostomata, Bl. Deser. 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 ex- 
panded 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 Cale-grossiér and 
London Clay. In general form this genus resembles Cassis, 
but is at once distinguished by the canal, which does not turn 
abruptly over the back, but is slightly curved upwards. Oniscta 
(C. Oniscus, &c. Lam.) is distinguished by the shortness of the 
