﻿376 ANODONTA 



W'ashiii.^toii ; < ^rcs^on : Xorlli California; I'.ast to Great Salt 

 J.ake. 



Type locality. Wahlaniat River near its junction with the 

 Columbia. 

 Anodonta orci^onoisis LivA, 'JV. Am. I'liil. v^oc. \'I, 1838. p. 



80. pi. XXI. hg. 67: Olis.. II. 1838. ]). 80. 1)1. XXI, fig-. 67. — 



Cr.ESSiN, Conch. Cab. Ano., 1874. p. 170. ])1. ia'i. fi.e:s. 5. 6. 



— Simpson. Syn.. kkx), p. 628. 

 7l/fl;-.i^rtr;/o ( .Inodonta) orci;,onensis Lea, Syn.. 1838, p. 30. 

 Anodon orci:;onc}isis Cati.ow and Reicvk, Conch. Nom.. 1845, 



p. 67. — SowERHV, Conch. Icon., X\'II, 1867, pi. xvii, fig-. 63. 

 Mari^^aroii I Anodoiito ) orci^onmsis T^ea, Syn.. 1852, p. 49; 



1870. p. y^. 

 Anodon co^^nata Could, IVoc. IJost. Soc. Xat. Hist., Ill, 1850, 



p. 294. 

 Anodonta cognata CtOULIi. I'. S. Kxpl. Exp.. XIT. 1852. p. 435, 



figs. 546, 546a. 546^. 

 Anodonta cyi:;nca (part), Hannibal, Proc. Mai. Soc. London, 



X. 1912, p. 125. pi. V, figs. 3. 4. 8. 



Lea describes this as a thin shell, but nearly all the specimens 

 in his collection, including most of those of the type lot, which 

 he received from Nuttall, are more or less solid. A fine spec- 

 imen in his collection from Fort George. Oregon, is as solid 

 in front as many of the I'nios. I am not sure that the tx'pe 

 shell — the one figured — is in the Lea Collection, though one 

 of the Nuttall shells, which is broken, may be that. In general, 

 this form is reasonably distinct. It is shaped like some of the 

 specimens of A. inif^licata or .1. cataracta. is generally decid- 

 edly greenish in its general tint and shining. It is larger and 

 much less winged or cut away at the dorsal slope than ./. 

 7i'o}ilametensis. 



Anodonta cai.ieorxiexsis Lea. 



Shell very thin, irregularly obovate. subcompressed. its great- 

 est inflation being a little in front of the middle : posterior ridge 

 low. rounded ; in front of the ridge the shell is decidedly com- 

 pressed ; dorsal wing considerably developed, angulate behind ; 



