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; Muttall) ; 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). 



Distribution 

 of/ 



BULIM01DES 



its' //« 



Fig. 16. 



BRITISH AMERICA. 



British Columbia: Victoria, Victoria District, Vancouver Island (Phila. 

 Acad.). 



Geological Distribution : Unknown. 



Ecology: 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. 



