98 CAROCOLLA. 



somewhat surprising that this genus, which contains some of the 

 most beautiful forms of bivalve Testacea, should have been left 

 till quite lately without any attempt to revise the species and 

 settle the synonyms. The author of this Manual has endeavoured 

 to remedy this defect by publishing a catalogue of all the species 

 hitherto known, which amount to 97, including many new species 

 described by him in the " Proceedings of the Zoological Society," 

 in 1840. Parts 46 to 51, 149 and 150, and 177 to 184 of his 

 Conchological Illustrations contain figures of 60 species. Cardia 

 are frequent in all climates. 



CARINARIA. Auct. Class, Cephalopoda. Division, Monotha- 

 lamia, Lam. Fam. Nectopoda, Bl. — JDescr. Symmetrical or nearly 

 so, conical, thin, glassy, fragile, patelliform; with a fimbriated 

 dorsal keel; apex convolute, bent forwards; aperture oval, pointed 

 at the dorsal extremity. Hab. Amboyna, Indian Ocean, and Medi- 

 terranean Sea.— Obs. A most singular and beautiful shell, re- 

 markable for its transparency, its fragile structure, and the 

 dorsal keel, whence it derives its name. It was once so rare that 

 a single specimen was known to realize one hundred guineas. 

 Fig. 488. C. Mediterranea. 



CARINATED. (From Carina, a keel.) Applied to any shell having 

 a raised, thin ledge, passing round a whorl or any other part of a 

 shell, as in Carinaria, fig. 488. 



CAEINEA. Sw. A genus formed for the reception of Ovulum 

 gibbosum, Auct. and similar species, fig. 443. 



CARINELLA. Adanson. Lutraria papyracea, Lam. Ligula, 

 Leach. Fam Mactracea, Lam. Fig. 77 '., 



CARINIDEA. Sw. A sub-genus of the genus Canthorbis, Sw. 

 (Turbo.) thus described, "Imperforate ; spire pyramidal, acute ; 

 basal whorl concave beneath, and carinated round its circum 

 ference ; aperture oval, entire, slightly angulated at the base of 

 the pillar, which turns inwards- C. concavus, Martini, 168, fig. 

 1620, brevispinosus ? Sow. Gen. (Turbo,) fig. 1." 



CAROCOLLA. Auct. Fam. Colimacea, Lam. — Descr. Orbicular, 

 depressed, with the outer sides of the whorls angulated or keeled, 



