106 LAND AND FRESH-WATER SHELLS — STEARNS. 



Anodonta Nuttalliana Lea. 



+ J. Wahlainatimsis Lea. 

 + A. Oregonensis Lea. 

 -j- A. Californiensis Lea. 



Numerous examples, generally odd valves of dead shells, inclnding 

 the two varieties which correspond to Dr. Lea's types of his Nuttalliana 

 and Californiemis, were obtained in the East Humboldt liiver, near 

 Battle Mountain (Mus. No. 120000), also from the same stream at Elko, 

 Nevada (Mus. No. 120905), by Mr. Bailey. The forms Oregonensis, in 

 W'hich the dorsal wing is the least developed, and Wahlamatensis, which 

 exhibits this feature conspicuously, were not distinctly represented in 

 the lots from these places, in the mature form, though in certain valves 

 the earlier zones of growth indicate the outlines which characterize the 

 varieties of Nuttalliana to which Dr. Lea applied these last two names. 



Anodonta inibecilis Say. 

 Devil's River, Texas, William Lloyd (Mns. No. 118399). 



Several examples of this delicate species, so like varieties of the Euro- 

 pean anatina as to be difficult of separation, were found as above by 

 Mr. Lloyd. A. anatina is otherwise represented elsewhere in North 

 America by A. Jiuviatilis and other alleged species. 



Sub-order Conchacea. 



Sphaerinm. dentatiini H.ald. 



Nevada, East Humboldt River, at Elko (Mus. No. 120913), and near Battle Mouu- 

 taiu, in the same stream (Mus. No. 120914), Veruou liailey. 



Pisidiiini occidentale Newc. 



Bridger's Pass, Wyoming, "in a spring iu cafiou," Vernon Bailey (Mus. No. 

 118482). 



