TRANSACTIONS 



OF 



THE AMERICAN PHILOSOPHICAL SOCIETY. 



ARTICLE I. 



Description of New Freshwater and Land Shells. By Isaac Lea, 



Read December 19, 1834. 



Anodonta GiGANTEA. Plate I. fig. 1. 



Testa ovata, injiala, antice latissima, posiice angiilaia, incBquilaterali ; valvuUs crassis ; 

 naiibus prominentibus ; margarila alba. 



Shell ovate, inflated, broad before, angular behind, inequilateral ; valves thick ; beaks 

 prominent; nacie pearly white. 



Hab. near Port Gibson. T. W. Robeson. 



My Cabinet. 

 Diam. 3-3, Length 4*8, Breadth 7-8 inches. 



Shell ovate, inflated, broad before, angular behind, inequilateral: 

 substance of the shell thick ; beaks prominent, granulate at tip ; epi- 

 dermis dark brown, smooth ; anterior and posterior cicatrices both con- 

 fluent ; dorsal cicatrices near the margin anterior to the beaks ; cavity 

 of the shell very deep; cavity of the beaks deep; nacre white and 

 richly pearly. 



VI. — A 



