﻿ANODONTA 43 r 



Missouri River; Upper Mississippi River drainage; east to 

 Indiana ; Tyler, Texas. ? 



Type locality. Upper Missouri River. 

 Anodonta corpulcnta Cooper, App. to Narrative, Exp. Miss, to- 



It. L., 1834, p. 154. — Simpson, Syn., 1900, p. 646. 

 Anodon corpnlenta Sovverby. Conch. Icon., XVII, 1870. pi. 



xxxiT, fig. T29. 

 Margaron (Anodonta) corpiilcnto Lea, Syn., 1870, p. 81. 



A magnificent Anodonta, which is generally rather smooth 

 when young, but often becomes dark and rough when old. It 

 is doubtful whether Sowerby's figure in the Conchologia rep- 

 resents this, as it is too long and brightly painted for Cooper's 

 species. There is a very fine specimen in Dr. Lea's collection 

 presented to him by Mr. Cooper under the name Anodonta 

 corpulcnta, which agrees well with what is generally under- 

 stood for that species. It appears to be replaced in the South 

 by A. stctvartiana. 



Anodonta linneana Lea. 



Shell imevenly elliptical, inflated, thin or slightly thickened, 

 with very^ full, high beaks placed nearly in the center of the 

 shell, their sculpture a double row of tubercles, which are 

 sometimes developed from doubly-looped ridges : anterior 

 end rounded ; dorsal line curved, angled a little in front, w'ith 

 a low wing behind ; posterior slope somewhat truncated ; the 

 shell ends behind in a feeble biangulation just below the median 

 line ; epidermis greenish in young shells, brownish in adult 

 specimens, often banded, with two or three rays on the poste- 

 rior slope, not very smooth but slightly shining; nacre bluish, 

 purplish-white or salmon-color, bright, iridescent behind. 



Length 100, height 65, diam. 44 mm. 



Type locality. Lake Concordia, Louisiana. Also Colorado- 

 River, Texas. 

 Anodonta Unneana Lea, Tr. Am. Phil. Soc, 1852, p. 289, pL 



xxvii, fig. 51 ; Obs., \', 1852, p. 45. pi. XXVII. fig. 51. — Clfs- 



siN, Conch. Cab. Ano., 1874, p. 117, pi. xxxvi. figs. 5, 6.— 



Simpson, Syn., 1900, p. 646. 



