﻿430 ANODONTA 



Anodon stcwartiana Cati.ow and Ri:i:\k. Condi. Xom.. 1845, 



p. 68. 

 Anodon sfe-a'cirtiaiiiis Sdw icui'A', Concli. Icon.. W'll. 1870, pi. 



xxxiT. fig. 133. 

 Margarou (Anodonta) stcicartidna Ij:.\. Svn.. 1852. p. 51; 



1870, p. 81. 

 Anodonta 7'irens l,v..\. Tr. .\m. I'liil. v^oc. X. 1852, p. 290, pi. 



XXVIII. fig'. 53; 01)s., \'. 1852, J). 46, ])]. xwiii. fis:. 53. 

 Mari:;aron f Anodonta) 7'ircns I,i:.\. S\n.. 1852. p. 51 ; 1870. p. 



81. 

 Anodon lirens S()\\F:in;v. Conch. Icon.. X\ II, 1870. pi. xxxiv, 



fig. 138. 



\'erv close to A. corpvlcnta. bnt it is ,<4cncr.-;ll\- a little longer 

 in proportion to the height, the posterior point is more elevated, 

 the form is more nearly ovate, and it often has a peculiar, 

 grayish bloom that is not present in cor^uhnita. i have seen 

 specimens, which stand between it and A. bcalci and others 

 that closely approach . /. opaca. The type is a young shell and 

 gives no idea of what it is like when adult, but Lea has larger 

 shells with it from the type locality. The type of ./. i-ircns 

 is a young shell of the same species I think. 



Anodonta corpui.knt.k Cooper. 



Shell large, subrhomboid. strong or subsolid, intlated. some- 

 what inequilateral, with excessivelv full and high beaks, the 

 wide umbonal swelling extending down on the disk : the beak 

 sculpture consists of verv irregular corrugations, which are 

 somewhat doubly looped and subnodulous at the base of the 

 loops ; posterior ridge low. beginning behind the great umbonal 

 swelling and ending behind in a feeble biangulation below the 

 median line; dorsal wing moderate and short, with a long, 

 oblique truncation behind : anterior end round ; base slightly 

 curA-ed : surface with irregular growth-lines, often sulcate ; 

 epidermis olive or smoky-brown, sometimes quite dark, often 

 banded, rarely rayed: nacre whitish or dull i)nrplish, often 

 consideral)ly thickened in front. 



Length 170, height 108. diam. ~y mm. 



Length 175. height 112, diam. 68 mm. 



