THE NAUTILUS. 



at Elkton, Douglas Co. Washington: Olympia and San Juan Co., 

 Vancouver Id. (f-aludma nudea, 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. COLUMBIANA Heuiphill. Columbia R., near Wallula and near 

 mouth of Snake R.,in southwest Washington ; Snake 11., near Weiser, 

 western Idaho (Hemphill!). 



F. SEMINALIS (Hinds). California: Sacramento R. (Hinds, New- 

 comb); Shasta Co. (Newc.); Pitt R. (Gabb); South Fork of Pitt R., 

 at South Fork P. 0., Modoc Co., head of Fall R., Siskiyou Co., small 

 creek, 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. turb in! form-is Tryon and Lithoglyphus 

 cuminc/i Ffld. seem to be synonyms, the former perhaps a tenable small 

 variety. 



F. FUSCA (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 (HemphiH). 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 POMATIOPSIS Tryon. 



P. BINNEYI Tryon. Bolinas, Cal. 



P. CALIFORNICA 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 



