﻿466 A NOW) .NT O IDES 



in front (behind) from its dorsal to its ventral margin and nar- 

 rower behind (in front) while A. orcgonoisis is narrower in 

 front (behind) from its dorsal to its ventral margin and 

 broader behind (in front), -i. orcgoncnsis is also much more 

 inflated and some of our varieties inclined to be cylindrical, 

 while our variety is flat and compressed. 



Length 3.5. height 1.75, diam. Js inch." (Hemphill). 



Type locality, Russian J>.iver, Putah Creek and Upper San 

 Joaquin River, California. 

 Anodonta angulata var. subangniata ilHMriiii.i., Zoe. I, 189U 



p. 325, pi. X, ligs. 1-2. 

 Gonidca angulata var. baroldiana Dai.i., Smith. Misc. Coll.^ 



50, 1908, p. 499. — Hannh'-al^ Proc. Alal. Soc. London, X, 



1912, p. 127, pi. VI, fig. 10. 



The description of this form was unknown to me w'hen the 

 Synopsis was published. It will be noticed, as indicated above,, 

 that the author in preparing his description miscalled the an- 

 terior and posterior ends of the shell. 



Anthony's subaiigulata was described as an "Anodoti" and 

 not as an Anodonto. and, therefore, does not prevent the re- 

 tention of Hemphill's name. 



Genus WODOXTOlDES Simpson (in I'.aker), 1898. 



Anodontopsis Simpson^ (in Baker), Tr. St. Louis Ac. Sci.,. 



\'in, 1898, p. 76; not Anodontopsis McCoy. 

 Anodontoides Simpson, (in Baker), Moll. Chicago, 1898, p. 



72. — Ortmann, Ann. Car. Mus.. \'!n. i()i2, p. 293. 



Shell elliptical, inflated, thin, with a faint posterior ridge; 

 sometimes constricted at the center of the base ; beaks rather 

 full with a few coarse, subparallel, concentric ridges, which 

 are curved up rather suddenly behind, and back of these there 

 are fine radiating ridges ; epidermis smooth, shining, often ray- 

 ed • hinge line slightly incurved in front of the beaks, edentu- 

 lous or bearing the merest rudiments of teeth : nniscle scars- 

 shallow, irregular ; nacre bluish-white. 



