78 POPULAR CONCHOLOGY. 



resemble the Pholas in its habits, and is found 

 in calcareous rocks, which it is supposed 

 to pierce by means of an acid. Masses of 

 rock on the coast of England are frequently- 

 found pierced with innumerable small holes, 

 the entrances to the habitations of these ani- 

 mals. M. Fleuriau de Bellevue, who has ex- 

 amined this family particularly, finds they are 

 phosphorescent. 



33. Petkicola. — Shell inequilateral, vari- 



ously oblong, trans- 

 verse, and equivalve, 



no epidermis; hinge J_ 

 furnished with two /^^~ 

 teeth on one valve, 

 and one or two on the other ; slightly gaping. 

 Animal, foot small and tongue-shaped. — 11 

 species recent, and 4 fossil. 



Found in many parts of the world in rocks, 

 corals, &c, but most abundant in America. 

 The shell is rather delicate, white, and ra- 

 diated. 



34. Venekupis. — Shell transverse, inequi- 

 lateral, striated, and slightly gaping; three 

 cardinal teeth placed close to each other, ge- 



