CONCHIFERA OR BIVALVES. 85 



other, none lateral, margins 

 not crenulated. Animal, 

 foot compressed and very 

 large. — 2 species recent. 



India and Brazil produce 

 this shell, which lies buried at small depths in 

 the sand ; it has an epidermis. 



The genus Crassina, which follows Capsa 

 in Lamarck's system, has been removed to the 

 next family, under the name of Astarte, which 

 had been previously given to it by Sowerby. 



Division III. — Conchifera lamellipeda.* 

 Shell closed. 



This division contains four families: Con- 

 chidce, Cardiidce, Arcidce, and Naiidce. 



Family 8. — Conckida.f 



This family is often considered one of the 

 most beautiful amongst the Bivalves. It is 

 composed of shells having three cardinal teeth 

 at least in one valve ; but not always lateral 



* Conchiferes lamellipedes, Lamarck. Lamellipeda, from 

 lamella, a thin plate, and pedes, feet. 

 f Les Conques, Lamarck. 



G 3 



