THE NAUTILUS. DBS 
at Elkton, Douglas Co. Washington: Olympia and San Juan Co., 
Vancouver Id. (Faludina nuclea Lea is a synonym.) 
F. NUTTALLIANA (Lea). Oregon: Willamette R. at Oregon City ; 
Crooked creek, a tributary of the Owyhee R., Malheur Co. (Amnicola 
hindsi Baird, described from Kootenay R., a tributary of the upper 
Columbia, in British Columbia, is a synonym.) This species probably 
inhabits the entire Columbia Valley. 
F. conuMBIANA Hemphill. Columbia R., near Wallula and near 
mouth of Snake R.,in southwest Washington; Snake R., near Weiser, 
western Idaho (Hemphill!). 
F. seMINALIS (Hinds). California: Sacramento R. (Hinds, New- 
comb); Shasta Co. (Newe.); Pitt R. (Gabb); South Fork of Pitt R., 
at South Fork P. O., Modoe Co., head of Fall R., Siskiyou Co., small 
ereek, Eagle Lake, Lassen Co. (MacGregor); Surprise Valley, north- 
east Cal. (Gabb) Oregon: Klamath R.; west side of Stein’s Mts., 
Harney Co. (Gabb). 
Var. dalli (Call). Brook flowing into north end of Pyramid Lake, 
Nevada, (Call). 
Var. Crane Lake Valley, northeast California. (Gabb.) 
Amnicola dalli Call, A. turbiniformis Tryon and Lithoglyphus 
cuming? Ffld. seem to be synonyms, the former perhaps a tenable small 
variety. 
F. rusca (Hald) Wyoming: Black's Fork, Green River, at 
Millersville, and Smith’s Fork Green R. (Dr. Jos. Leidy). Utah: 
Utah Lake; Bear Lake (Hayden), Malad River (Hemphi!l). South 
Dakota: Cheyenne Pass (Carter). The localities “California’”’ and 
“Oregon” for this species probably refer to former wide extension of 
these territories to the eastward. 
F. erYTHROPOMA Pilsbry. A spring in Ash Meadows, Nye Co., 
Nevada (Stephens). (F. fusca Hald. var. minor, Stearns, N. A. 
Fauna No. 7, p. 282). Differs conspicuously from F. fusca in the less 
rapidly widening whorls of the operculum. 
F. MERRIAMI Pilsbry and Beecher. Warm Springs, Pahranagat 
Valley, Nevada (Merriam). 
Genus Pomariopsis Tryon. 
P. BINNEY! Tryon. Bolinas, Cal. 
P. cauirorNica Pilsbry. San Francisco and Oakland, California. 
Hydrobia californica Tryon is an Assiminea; ‘“ H. egena Gld.” of 
some collectors is the large form of Paludestrina imitator, the original 
