NO. 1250. FOSSIL SHELLS OF THE COLORADO DESERT— STEA RXS 285 
Fig. 2. — Amnicola i.ongin- 
identitied." 
tared surface. This little species is widely distributed; it occurs not 
only in the Colorado desert in a semifossil state, 
but throughout the Great Basin, living and dead, 
as follows: Upper Lahontan beds at south end of 
Winnemucca Lake, and at Buffalo Springs (Call); 
Nevada and Utah (Hemphill); Bear Lake and 
Utah Lake (Hayden, Putnam); Southeastern 
Oregon (Gabb); at Campo and Springs in Cuya- 
maca Mountains. San Diego Co. (Hemphill); Indio 
and other localities in Colorado desert (Stearns). 
Dr. Gould's specimens were collected in the 
'^Cienaga Grande" by Prof. William P. Blake, 
of the Pacific Railroad surveys. 
Dr. Pilsbry regards Bythinella hitermedla 
Tryon, as a synonvm and speaks of P. Jonylnqua^ 
as " extremely variable, * * * often incorrectly 
[U.S.N.M. No.'l04885.] 
FLUMINICOLA COLUMBIANA (Hemphill) Pilsbry. 
Fluminicola columbiana Pilsbry, Nautilus, XII, No. 11, March, 1899, p. 125. 
Fhiminicola nuttalliana var. columbiano Hemphill manuscript. 
Columbia River, near Wallula and near mouth of Snake River in 
southwest Washington ; Snake River near Weiser, western Idaho (Hemp- 
hill). Colorado desert, semifossil (Stearns). 
A single example was detected by me while 
examining the 40,000 examples of /*. protea^ 
etc. I had labeled it F. nuttalliana. It agrees 
so well with Dr. Pilsbry's description of F. 
colunihiana that I have no doubt it belongs to 
that species. [U.S.N.M. No. 3847.] 
The following forms collected by the Death 
Vallev Expedition in 1891 were tirst made 
known in the report of said expedition pub- 
lished in 1893.'^ As the report has long since 
been out of print and many persons interested 
in the study of the mollusca have never seen the descriptions or 
figures, it is thought advisable to republish them in this connection, 
although the shells have not as yet been detected in that portion of 
the Great Desert to which this paper in the main refers. 
Fig. 3.— Fluminicola Colum- 
biana (Hemphill). 
' The figure (173) in Binney is so very poor that the species could hardly be deter- 
mined by it. The figures in the text numbered 2 and 3 are by Dr. McConnell. The 
latter form has not been figured before. 
^ North American Fauna No. 7, Part II, U. S. Dept. Agriculture, pp. 269 to 283. 
Through the courtesy of the Hon. James Wilson, Secretary of Agriculture, and the 
kindness of Dr. C. Hart Merriam, (;hief of the Biological Survey of above Department, 
I am able to present the figures of these species. 
