84 



POPULAR CONCHOLOGY. 



The interior of this shell is often punctured 

 with small holes or strice. 



4 1 . Don ax. — Shell equivalve, inequilateral, 

 transverse, wedge-shaped, 

 cardinal teeth tw T o, on one 

 or both valves, lateral 

 variable, ligament on the 

 shortest side, which is 

 very much flattened or 

 truncated, valves more or less crenulated at the 

 margin. Animal, foot compressed, sharp, and 

 angular. — 30 species recent, and 9 fossil. 



The Donax is found in all parts of the world, 

 buried in the sand of the sea shore ; many of 

 the species are beautiful. 



42. Capsa. — Shell transverse, somewhat 

 triangular, equivalve but rather inequilateral, 

 ligament exterior and on the shortest side, two 

 cardinal teeth on one valve, and one on the 



