VIII GLOSSARY. 



Beaky Beaked, having the extremity of the base of the 

 shell elongated and contracted in the form of a beak. 



Bearded, when the epidermis 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. fig, 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, channeled or grooved. 

 Cardinal see Teetk. 



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 (ilaments. 

 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. 

 Concameratcd, see Chambered. 

 Convolute, when the whirls turn round a lengthened cone, 



nearly vertical to each other. 

 Coidiform, heart-shaped. 

 Coronated, having the apex surrounded with a row of 



tubercles or spines. 

 Crenated, Crenulate, having blunt Iccth, 



