202 GLOSSARY. 
Beak, 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 nature, 
(see plate 13. fig. 2.) 
Bifid, forked. 
Byssus, a hair-like substance formed by some of the auimals 
of Bivalves, by which they attach themselves to extraneous 
bodies. 
Callous, indurated. 
Callus, a thick excrescence. 
Canal, the prolongation of the mouth ina 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 partitious, 
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 tubercles 
or spines. 
Crenated, Crenulate, having blunt teeth. 
Decollated, having the spire or upper part of the shell trun- 
cated transversely. 
