lis is of a bristly or hairy na- 

 ture. 



Bifid, forked. 



Byssus, a hair-like substance formed by some of the ani- 

 mals of Bivalves, by which they attach themselves to 

 extraneous bodies. See plate 6, Jig. 1. 



Callous, indurated. 



Callus, a thick excrescence. 



Canal, the prolongation of the mouth in a kind of groove 

 or gutter, as in the Murex and Strombus. 



Canaliculated, channelled or grooved. 



Cardinal, see Teeth. 



Carinated, having the form of a boat's keel. 



Cartilage, see Ligament. 



Cartilaginous, resembling a ligament. 



Chambered, when the shell is internally divided by par- 

 titions parallel to the aperture. 



Ciliated, surrounded with parallel filaments. 



Clavate, club-shaped. 



Columella, that part of the shell round which the whirls 

 turn. 



Compressed, (in Bivalves), when the valves are nearly flat, 

 or flattened. 



Concamerated, see Chambered. 



Convolute, when the whirls turn round a lengthened cone, 

 nearly vertical to each other. 



Cordiform, heart-shaped. 



Coronated, having the apex surrounded with a row of tu- 

 bercles or spines. 



Crenated, Crenulate, having blunt teeth. 



Decollated, having the spire or upper part of the shell 

 truncated transversely. 



