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. (Cincinnatia) CINCINNATIENSIS (Anth.). Lake Point, (Hemp- 
hill) and terraces, (‘‘ Bonneville” ) and Salt Lake, (Hayden); Sevier 
Lake Valley, Utah (Wheeler Exped.). 
Genus PyRGULOopsisS Call and Pils. 
P. NEVADENSIS (Stearns). Pyramid Lake, Nevada. 
Genus PALUDESTRINA Orb. 
[Includes Bythinella Moq. Vand., and of authors generally. ] 
P. LonGainqua (Gould). Colorado Desert, southern California, at 
Indio, ete. (fossil specimens); Campo, and springs in Cayamaca Mts., 
San Diego (‘o., (Hemphill); Arizona Desert (R. EK. C. Stearns); near 
White Pine, Nevada (Hemphill); Weber Caton, 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. rmrraror Pilsbry. Sonoma, Alameda and Santa Cruz counties, 
California. 
P. stTEARNSIANA Pilsbry. Marin, Alameda, Tuolumme, Santa Clara 
vend Santa Cruz counties, California. 
P. HEMPHILL (Pils.) near Kentucky Ferry, Snake River, Wash- 
ington (Hemphill). 
P. prorea (Gld.) Colorado Desert; Death Valley, Cal; States of 
Durango and Michoacan, Mexico. 
Bythinella seemani Ffld. is a synonym or smooth local race; FP. 
protea varies, as Dr. Stearns has shown, from latticed to smooth. 
“ Bythinella” cequicostata 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 Stimpson. 
T. cLATHRATA Stimps. ‘Colorado Desert”; Pahranagat Valley, 
Nevada (Merriam). 
Genus FLUMINICOLA Stimps. 
F. virens (Lea). Oregon: Willamette R. at Portland and Oregon 
City; Columbia R. at the Dalles; upper Des Chutes R.; Umpqua R. 
