﻿3^0 ANODONTA 



bluisli-white, occasionally liiilcd with lurid purple, ralhcr dull, 

 thicker in front. 



Length Sj. lu'is^ln (>2. diani. 2j mm. 



Length Sy, height 55, diani. 2y mm. ' 



Washington ; south to southern California ; east to Utah. 



Type locality, Wahlamat River near its junction with the 

 Columbia. 

 Anodonta ivahlamctcnsis Lka, Tr. Am. Phil. Soc, \'T. 1838, p. 



78, pi. XX, fig. 64; Obs.. 11, 1838. p. 78, pi. XX, fig. 64.— 



Hanlkv, P)iv. Shells. 1843, p. 215. pi. xxiv, fig. 13. — Ci.ks- 



siN. Conch. Cab. Ano., 1874. ]). 161. pi. i.m, figs. 7, 8. — 



.Simpson, Syn.. 1900, p. Cm^). 

 Margarita (.hwdonta) ivahlaincicnsis Lf.a, Snii., 1838, p. 2Q. 

 Anodon i^'ahlanictcnsis Catlow and Ricevk. Conch. Nom., 



1845, P- ^*8. — SowKRi'.Y, Conch. Icon., X\II, 18C17. ])1. ix, 



fig. 22. 

 Margaron (Anodonta) -iCahlauictcnsis IvEA. Syn., 1852. ]). 47; 



1870, p. 75. 

 Anodonta rotundovata Trask, Pr. Cal. Ac. Sci.. L 1855. p. 29. 

 Anodon rnstratiis Sowkrhv. Conch. Icon.. X\'IT, 1867. pi. ii. 



fig. 4. 

 Anodonta laoscnsis Fisctii':r. Ihill. Soc. H. N. .Autun.. i8()i. p. 



219. 

 Anodonta cygnea imf>ura (part), Haxnihai., Proc. Mai. Soc. 



London, X. 1912, p. 125. 



Quite variable in form, but generally having a high wing and 

 an upturned, rounded point or beak behind, above which the 

 truncation of the posterior slope is decidedlv incurved. The 

 shell is usually larger and darker than either ./. calif ornirn<;is- 

 or nitttalliana. Certain specimens of this species gape at ihe 

 anterior base. 



Sowerby states that his ,/. rostratiis is from Laos, an error 

 without (lou1)t. as it is certainl\- ./. -n-ah!anictciisis. As the 

 name rostrata had been used for an .Inodonta by Kokeil (or 

 Rossmassler) Fischer changed Sowerby "s name to laoscnsis^ 



