212 THE CHICAGO ACADEMY OF SCIENCES. 
Co., Cal., and Lower Cal.; Oakland and West Berkeley, Alameda Co.; Fulton, 
Sonoma Co. (Hemphill) ; San Francisco, San Francisco Co. (Gabb; Hemphill; 
Lea; Raymond; Rowell; Stearns; Tryon); San Diego Co. (Roper); Merced 
Lake, Merced Co. (Smith. Coll.) ; Sausalito, Marin Co.; Alameda Co. (Stearns) ; 
San Luis Obispo Co.; Alameda Co. (Orcutt; Walker). 
OreGon: Johnson’s Creek, Portland, Multnomah Co. (Benedict); Port- 
land (Ferriss); Oregon (Lea; Nuttall); East Portland (Walker). 
WASHINGTON: Vancouver (Gabb) ; Seattle, King Co., in greenhouse (Ran- 
dolph) ; Columbia River, near Vancouver, Clarke Co. (Smith. Coll.) ; Grand 
Coulee, Blue Lake, Douglas Co. (R. S. Snodgrass). 



Fic. 16. 
BRITISH AMERICA. 
BritisH CoLtuMBIA: Victoria, Victoria District, Vancouver Island (Phila. 
Acad.). 
GEOLOGICAL DisTRIBUTION: Unknown. 
Ecotocy: Not recorded. Shells believed to be this species have 
been found at the outlet of Lake Tahoe, California, at an altitude of 
6247 feet. 
ANIMAL, JAW, RADULA and GENITALIA: Not examined. 
