﻿ANODONTA 375 



olive or brownish, showing the rest periods quite plainly ; nacre 

 bluish-white sometimes a little iridescent behind. 



Length 93, height 47. diam. 2^ mm. 



Length 85, height 42, diam. 2"] mm. 



Puget Sound ; British Columbia. 



Type locality, Chiloweyuck Depot, Puget Sound. 

 Anodonta kennerlyi Lea, Pr. Ac. Nat. Sci. Phila., IV, i860, p. 



306; Jl. Ac. Nat. Sci. Phila., V, 1862, p. 108, pi. xviii, tig. 



256; Obs., Vin, 1862, p. 112, pi. xvHi, fig. 256. — Simpson, 



Syn., iQoo, p. 628. 

 Anodon kennerlyi Soweri'.y, Conch, icon., X\TL 1870, pi. 



XXXIV, fig. 139. 

 Margaron (Anodonta) kennerlyi Lea, Syn., 1870, p. 79. 

 Anodonta cygnea (part) Hannibal, Proc. Mai. Soc. London, 



X, 1912, p. 125. 



Apparently a rare form, but all the specimens I have seen 

 seem to be distinct from any other species. The shell is ex- 

 ceedingly thin, like the Anodonta marginata of Say, and is 

 shaped something like that species, being much elongated. It 

 is not so smooth as Say's species. The epidermis is rather 

 dull and the rest periods are well marked in all the examples 

 I have seen. 



Anodonta Oregon ensis Lea. 



Shell long elliptical, inequilateral, moderately strong, scarce- 

 ly inflated, with rather low, somewhat corrugated beaks, their 

 sculpture consisting of fine, somewhat corrugated bars run- 

 ning generally parallel with the hinge line ; dorsal line nearly 

 straight ; dorsal wing slightl}- developed, angled and obliquely 

 truncate behind ; posterior ridge low, faintly double and end- 

 ing in a feeble biangulation behind about on the median line ; 

 surface smooth, pale greenish-yellow or yellowish-green, often 

 banded with darker color and showing the rest periods, shin- 

 ing ; nacre bluish-white, sometimes tinged purplish, usually 

 thicker in front. 



Length 1 14, height -,/. diam. 35 mm. 



Length 94, height 50, diam. 30 mm. 



