A DICTIONARY OF TERMS. 



liii 



Compressed. 



concamerated. 

 Contour. - - 



CoRCELET. 



cordiforme. 

 Coriaceous. 



Cremated. 

 Crest. - - 



Nearly flat. Several of the Tellens are com- 

 pressed shells. 



The same as chambered. 



The exterior surface, and round the edge of 

 a shell. The Tuns are round in their contour ; 

 the Murex is angular. 



The part near the hinge in bivalve shells, to 

 which the ligament is attached. It is remark- 

 able in the shells of the genus Venus, and 

 received one of those names from Linnaeus, 

 which disgrace the pages of his Systema 

 Natura. 



Heart-shaped. The Cockles and some other 

 shells are cordiforme. 



Hard and fibrous ; of a substance between 

 horn and skin. 



Having blunt teeth. The margins of many 

 bivalve shells are crenated. 



Crested like the comb of a cock. Some oysters 

 are crested. 



Decussated. 

 Dentated. 



Diaphonous. 

 Digitated. 



Diverging. - 

 Dorsal. - - 



Ears. - - ~ 



D. 



Striated crossways. 



Toothed. The margin of most Cockles are 

 dentated. 



Transparent when held to the light. 



Made in the shape of fingers. The lips of 

 some shells of the genus Strombus are digi- 

 tated. 



Separating from a point. The teeth in the 

 Anomia placenta diverge. 



Belonging to the back. 



E. 



External projections, nearly triangular, which 

 are seen at the base of Pectens. 



