312 MARINE SHELLS 



Occurs on the coast of Maryland and as far south 

 as East Florida. 



Inhabits the coast of the United States. 



Cabinet of the Academy and Philadelphia Mu- 

 seum. 



Very distinct from the preceding species, and 

 probably approaches L. crassiplica of Lamarck. 



CORBULA, Brug. 



Species. 



1. C. *contracta. Shell transversely subovate; 

 valves subequal, regularly and profoundly striated 

 transversely; beaks not prominent, nearly central, 

 one side rounded and the other subacute ; basal mar- 

 gin contracted near the middle, and one half of the 

 length of the edge of one valve concealing one half 

 of the edge of the opposite valve. 



Length one-fourth of an inch. 



Breadth two-fifths of an inch. 



Thickness one-fifth of an inch, nearly. 



Inhabits the coasts of Georgia and East Florida. 



Cabinet of the Academy and Philadelphia Mu- 

 seum. 



I found only two specimens of this shell. The 

 striae are precisely similar to those of the larger valve 

 of Mija inceqaivalvis of Montague (C. nucleus of 

 Lam.) 



