350 



POPULAR CONCHOLOGY. 



brous texture, inequivalve, inferior valve very long, 

 conical, fixed by the extremity of the horn-shaped boss, 

 marked exteriorly by a longitudinal groove ; between the 

 internal and external coat, there is a series of round or 

 angular canals (the larger ones near the internal border, 

 the others small, between the first and the external coat), 

 which perforate throughout the thickness of the shell: 

 superior valve twisted into an oblique spiral, provided in 

 the interior of the shelly matter by canals analogous to 

 those of the other valve * ; it appears to be united to the 

 other without hinge. — Fossil. 



Mr. Sharpe has the same opinion of this* genus as of 

 Caprina. 



Caprinella. UOrb. (Ichthyosarcolithes, Desmarest.) 

 This genus, formed by D'Orbigny out of some specimens 

 he afterwards lost, is scarcely admissible. 



The Sixth Class, Tunicata, of Lamarck, will not be 

 described in this work, as the Molluscs have no shell. 



* This is not considered correct by Mr. Sharpe. 



