NEW FRESH WATER AND LAND SHELLS. 225 



Anodonta ferruginea. Plate 19, Fig. 43. 



Testa ellipticd, inflatd; oalvulis tenuibus; natibus prominentibus, ad apices minutl undulatis, ferrugi- 

 neis; epidermide tenebroso-fuscd, politd; margaritd caruleo-albd et iridescente. 



Shell elliptical, inflated; valves thin; beaks prominent, minutely undulate at the tips, ferruginous; epi- 

 dermis dark brown and polished; nacre bluish-white and iridescent. 



Hab. Simon's Creek, Indiana. T. G. Lea. 



My Cabinet, and Cabinet of T. G. Lea. 

 Diam. .1, Length 1.3, Breadth 2.4 inches. 



Shell elliptical, inflated, posterior margin biangular; substance of the shell 

 thin; beaks ferruginous, prominent, with three or four nearly concentric small 

 folds at the tip; ligament long and thin; epidermis dark brown and shining; ante- 

 rior cicatrices confluent; posterior cicatrices confluent; dorsal cicatrices placed 

 nearly in the centre of the cavity of the beaks; cavity of the shell deep and 

 rounded; cavity of the beaks shallow; dorsal line slightly curved under the 

 beaks; nacre bluish- white and iridescent. 



Remarhs. — This is a small species with remarkably ferruginous beaks, and 

 dark brown, sometimes greenish epidermis. Indistinct rays may be observed 

 on some individuals. The lines of growth are dark, and in some specimens 

 the basal margin is disposed to be emarginate. It is somewhat allied to An. un- 

 dulata, Say, but differs very much in colour and undulations of the beaks. 



Anodonta Footiana. Plate 20, Fig. 44. 



Testd ellipticd, inflatd, inaquilaterali ; valvulis subtenuibus ; natibus subprominentibus, ad apices un- 

 dulatis; epidermide luteo-fuscd; margaritd cmruleo-albd et iridescente. 



Shell elliptical, inflated, inequilateral ; valves thin ; beaks rather prominent, undulate at the tips ; epidermis 

 yellowish-brown ; nacre bluish white and iridescent. 



Hab. Vicinity of Fort Winnebago. Dr. Foot. 



My Cabinet. 

 Diam. 1.2, Length 1.9, Breadth 3.3 inches. 



Shell elliptical, inflated, inequilateral, angular behind ; substance of the shell 

 rather thin; beaks rather prominent, undulate at the tip; ligament rather short 

 and thin; epidermis yellowish-brown; anterior cicatrices confluent; posterior 



