UMTKl) STATES AND NultTirKKN MKXItu 47 



tusel}' angular before; valves rather thick, thicker before; beaks slightly prominent, 

 undulate at the tips; epidermis olivaceous, trans^rsely banded and obscurely 

 radiate; nacre bluish white and verj' iridescent. 

 Proo. Acad. Nat. Sci. 1857, p. 84. 



Hah. — Pond near Knlaniazoo. Michigan. .T. Tiowis, M. D. 



My cabinet. 

 Diam. -7, Length '♦. Breadth 1-8 inches. 



Shell smooth, elliptical, somewhat inflated, very inequilateral, subemarginate, ob- 

 tusely angular before ; substance of the shell rather thick, thicker before ; beaks slightly 

 prominent, with a few small, irregular undulations at the tips ; ligament rather long, 

 thin and light brown ; epidermis dark olive color, transversely banded, obscurely 

 radiate, with distant well marked lines of growth ; umbonial slope raised and obtusely 

 angular ; posterior slope slightly raised, with three obscure rays from the beaks to the 

 margin on each valve ; anterior cicatrices confluent, small and slightly impressed ; 

 posterior cicatrices confluent and very slightly impressed ; dorsal cicatrices jjlaced in 

 the upper part of the cavity of the beaks ; cavity of the shell rather deep and wide ; 

 cavity of the beaks very shallow and obtusely angular; nacre bluish white and very 

 iridescent. 



Remarhi. — Only a single specimen was received by Dr. Lewis, and I owe to his 

 kindness the possession of it. It is near to Fenissct/ciana (nobis), but differs in out- 

 line and in the beaks, and it is also a thicker shell. It has also some resemblance to 

 subcylindracea, (nobis), but is not so transverse and is smaller. 



Anodonta Danielsii. pi. 63, fig. 190. 



Testa Iffivi, elliptica, compressa, postice obtuse angulata, valde inas((uilatcrali ; valvulis subtenuibu.s ; natibus 

 prominulis, aJ apices undulatis ; cpidermide tenchroso-fusca, micante, obsolete radiatil ; inariraritu 

 cceruleo-alba et iridescente. 



Shell smooth, elliptical, compressed, obtusely angular behind, very inequilateral ; 

 valves rather thin ; beaks a little prominent, undulate at the tips ; epidermis dark 

 brown, shining, obscurely radiate ; nacre bluish white and iridescent. 

 Proo. Acad. Nat. Sci., 1858, p. 139. 



JJah. — Topeka, Kansas. Prof. Edward Daniels. 



My cabinet. 

 Diam. 1-3, Length 21, Breadth 39 inches. 



Shell smooth, elliptical, compressed, obtusely angular behind, very inequilateral ; 

 substance of the shell rather thin; beaks a little prominent, undulate in a double 

 series at the tips ; ligament rather long and large ; epidermis dark brown, shining, 

 obscurely rayed and with very distant marks of growth ; umbonial slope very much 

 inflated and rounded; posterior slope somewhat raised, dark brown, with two obscure 



