122 THE NAUTILUS. 



fornia: Death Valley, Inyo Co. (Nelson and Bailey); seven miles from 

 Fort Tejon, Kern Co. (W. J. Raymond). 



It is a species of the desert region. 



A. LIMOSA (Say). Utah Lake(Hayden and others), and Spring 

 Lake (Putnam), Utah. 



A. (pincinnatM) CINCINNATIENSIS (Anth.). Lake Point, (Hemp- 

 hill) and terraces, (" Bonneville" ) and Salt Lake, (Hayden); Sevier 

 Lake Valley, Utah (Wheeler Exped.). 



Genus PYRGULOPSIS Call and Pils. 



P. NEVADENSIS (Stearns). Pyramid Lake, Nevada. 

 Genus PALUDESTRINA Orb. 



[Includes Bythinella Moq. Tand., and of aulnurs gciicially.] 



P. LONGINQUA (Gould). Colorado Desert, southern California, at 

 Indio, etc (fossil specimens); Campo, and springs in Cayaniaca Mts., 

 San Diego Co., (Hemphill); Arizona Desert (R. E. C. Stearns); near 

 White Pine, Nevada (Hemphill); Weber Canon, near Provo, near 

 Brigham City, near Salt Lake City (Hemphill); Bear Lake (Hayden), 

 and Utah Lake, Utah (Putnam); Crooked creek, a tributary of the 

 Owyhee R., southeastern Oregon (Gabb.) Bythinella intermedia 

 Tryon is a synonym. An extremely variable, widely distributed spe- 

 cies, often incorrectly identified. 



P. IMITATOR Pilsbry. Sonoma, Alameda and Santa Cruz counties, 

 California. 



P. STEARNSIANA Pilsbry. Marin, Alameda, Tuolumme, Santa Clara 

 und Santa Cruz counties, California. 



P. HEMPHILLI (Pils.) near Kentucky Ferry, Snake River, Wash- 

 ington (Hemphill). 



P. PROTEA (Gld.) Colorado Desert; Death Valley, Cal ; States of 

 Durango and Michoacan. Mexico. 



Bythinella se.emani Ffld. is a synonym or smooth local race; P. 

 protea varies, as Dr. Stearns has shown, from latticed to smooth. 

 " Bythinella" sequicostata Pils., of Fla., is extremely similar. Tryonia 

 is probably only a subgenus of Paludestrina. (See Stearns, N. A. 

 Fauna No. 7, p. 278). 



Genus TRYONIA Stinipsou. 



T. CLATHRATA Stimps. "Colorado Desert"; Pahranagat Valley, 

 Nevada (Merriam). 



Genus FLUMINICOLA Stiinps. 



F. VIRENS (Lea). Oregon : Willamette R. at Portland and Oregon 

 City; Columbia R. at the Dalles; upper Des Chutes R.; Umpqua R. 



