﻿UNITED STATES AND NORTHERN MEXICO. 365 



tusely angular before ; valves rather thick, thicker before ; beaks slightly prominent, 



undulate at the tips; epidermis olivaceous, transversely banded and obscurely 



radiate ; nacre bluish white and very iridescent. 

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



Hob. — Pond near Kalamazoo, Michigan. J. Lewis, M. D. 



My cabinet. 

 Diam. °7, Length "9, 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 placed 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. 



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

 kindness the possession of it. It is near to Ferussaciana (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. PL 63, fig. 190° 



Testa laevi, elliptica, compressa, postice obtuse angulatii, valde inaequilaterali ; valvulis subtenuibus; natibus 

 prominulis, ad apices undulatis ; epidermide tenebroso-fusea, micanfe, obsolete radiata ; margarita 

 caeruleo-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. 

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



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



My cabinet. 

 Diam. 1-3, Length 21, Breadth 3-9 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 



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