202 GLOSSARY. 



Beak, Beaked, having tlie 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 nature, 



{see plate \S. fig. 2.) 

 Bifid, forked. 

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



of Bivalves, by which they attach themselves to extraneou» 



bodies. 



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 Liyament. 

 Cartilaginous, resembling a ligament. 

 Chambered, when the shell is internally divided by partitions, 



parallel to the aperture. 

 Ciliated, surrounded with parallel filaments. 

 Clavate, club shaped. 

 Columella, that part of the shell round which the whorls 



turn. 

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



or flattened. 

 Concamerated, see Chambered. 

 Convolute, when the whorls turn round a lengthened cone, 



nearly vertical to each other. 

 Cordiform, heart-shaped. 

 Coronated, having the apex surrounded with a row of tubercle* 



or spines. 

 Crenated, Crenulate, having blunt teeth. 



Decollated, having the spire or upper part of the shell trun- 

 cated transversely. 



