CORONTJLA. 123 



nerally to any shell which may be fancied to resemble a heart in 

 shape, as Isocardia, fig. 126, and Cardium Dionaeum, fig. 122. 



CORIACEOUS. (Corium, leather.) Of the substance of leather. 

 Ex., the integument into which the valves of Chitones are in- 

 serted. 



CORIOCELLA. Bl. The animal designated by this name is de- 

 scribed by De Blainville as being without any traces of shell, 

 either internal or external. This must have arisen from the 

 imperfection of the specimen described, probably deprived by 

 accident of its shell. The testaceous appendage of the Coriocella 

 is now well known to naturalists. It is a milky white, transpa- 

 rent shell, shaped like Sigaretus. 



CORNEA, and Pistjm, Megerle. Cyclas, Lam. 



CORNEO-CALCAREOUS. A term used to express the mixture of 

 horny and shelly matter which enters into the composition of 

 some shells, Aplysia, for instance. It is also applied to those 

 Opercula, which are horny on one side, and testaceous on the 

 other, as that of Turbo. 



CORNEUS. Horny. A species of Patella has had the specific 

 name corneus given to it, because its texture more nearly re- 

 sembles that of a horn than that of a shell. The epidermis of 

 fresh-water shells is of a similar composition. 



CORNUCOPIA. Humph. Lepas, Linn. 



CORONALES. See Coronular Multivalves. 



CORONATED. (Corona, a crown.) Applied to shells when orna- 

 mented with a series of points, tubercles, &c, round the upper 

 edges of the volutions. Ex. Conus Nocturnus, fig. 459. 



CORONAXIS. One of the two genera into which Swainson divides 

 the genus Conus, consisting of those species which have a row 

 of tubercles on the upper edge of the whorls, an arrangement by 

 which he would in many instances, not only separate between 

 two individuals of the same species, but also between two parts 

 of the same shell; for instances occur in which the earlier whorls 

 are coronated, while the body whorl and the penultimate are per- 

 fectly plain. 



CORONULA, {Corona, a crown, dim.) Order, Sessile Cirripedes, 



