72 POPULAR CONCHOLOGY. 



sian Gulf and Pacific Ocean. The shells are 

 small, and pearly inside : they bury themselves 

 very deep in the sand, and it requires some 

 exertion to get them out. 



24. Anatinella (Sowerby). — Shell ovate, 

 nearly equal, one end 

 rounded, the other trun- 

 cated or beaked ; liga- 

 ment internal, inserted 

 between two spoon- 

 shaped processes, one 

 in each valve, and on one side of each are two 

 cardinal teeth. Animal unknown. — 1 spe- 

 cies (?). 



This shell is thin, fragile, and rather pearly 

 inside. 



Division II. — Conchifera tenuipeda.* 

 Shell nearly closed. 



This division contains three families, Mac- 

 tridce, Lithophagidce, and Nymphidce ; the first 

 family has the ligament internal, and the others 

 external. The foot of the animal is small and 



* Conchiferes tenuipedes, Lamarck. Tenuipeda> from 

 tenuis, Lat., slender, and pedes, feet. 



