OFWESTCOASTMOLLUSCA. 19 



348 Limnophysa caperata Say. 



" S. F. to Oregon." Eastern States. 



349 Acella 



Spring on Spokan Plain, W. T. 



350 Physa Grosvenorii Lea. 



Dayton, Nevada. (Wheatley Mus.) Kansas. 



351 Physa coniformis Tryon. 

 Humboldt River, Nevada. 



352 Physa Cooperii Tryon. 

 Crane Lake Valley, northeast Cal. 



353 Physa sparsestriata Tryon. 

 San Joaquin Valley, Cal. 



354 Physa diaphana Tryon. 

 Oakland, Alameda Co., Cal. 



355 Physa malleata Tryon. 



Goose Lake Valley, N. E. Cal. Montana. 



356 Physa Nuttallii Lea. 

 Lewis River, Idaho. 



357 Physa distinguenda Tryon. 

 Marysville to Stockton, Cal. 



358 Physa politissima Tryon. 

 Sacramento, California. 



359 Physa parva Lea. 



Little Valley, Nov. (Wheatley Mus.) 



360 Physa propinqua Tryon. 

 Jordan Creek, southwest Idaho. 



361 Physa gyrina Say. 



Carson River, Nev. ; Utah. Eastern States. 



362 Physa ampullacea Gld. 

 Lake Osoyoos, lat. 49, Wash. Ter. 



363 Physa occidentalis Tryon. 

 Most of Cal. northward ; Idaho. 



364 Physa Gabbii Tryon. 



Mountain Lake, S. F. Co., to Los Angeles. 



365 Physa costata Newc. 

 Clear Lake, California. 



366 Physa virginea Gld. 

 Sacramento River, Cal. ; San Francisco ? 



367 Physa venusta Lea. 



Near Vancouver, Columbia R., W. T. 



368 Physa humerosa Gld. 

 Colorado R., Cal. ; Pecos R., Texas. 



369 Physa virgata Gld. 



S. Pedro to S. Diego ; Mojave R. to Gila R. 



