CORONAXIS. 127 



COEETUS, Adamson, 1757. Planorbis. 



COREPHITJM. Browne. Chiton ecliinatus, and similar species 

 with spires on the marginal integument. 



COEIACEOUS. {Corium, leather.) Of the substance of leather. 

 E.v. the integument into which the valves of Chitones are in- 

 serted. 



COEIOCELLA. Bl. The animal designated by this name is 

 described 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. 



CORJSTEA, and Pisijm, Megerle. Ctclas, Lam. 



COENEO-CALCAEEOUS. A term used to express the mix- 

 ture of horny and shelly matter which enters into the composi- 

 tion 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 ^f Turbo. 



COENEUS. 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. 



COENUCOPIA. Hum-ph. Lepas, Linn. 



COEONALES. See Coronulae MiriiTiVALVES. 



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

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

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



COEONAXIS. 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 arrange- 

 ment 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 perfectly plain. 



