THE OPALINIlJ CILIATE INFUSORIANS. 



297 



off southern California, the coastal ranges of California, Oregon 

 and Washington (including the Santa Inez mountains at Santa Bar- 

 bara, Presidio Hill and Mount Tamalpais at San Francisco, the Siski- 

 you Mountains and the Olympic Mountains) and the Alaska islands 



'*^— ^-- 





on to the Aleutian Peninsula and across to Siberia. Puget Sound, 

 San Francisco Bay and San Diego Bay may be remnants of the broad 

 ocean straight running from the Gulf of Mexico to the Arctic Ocean, 

 and separating this eastern Pacific land strip from other North 

 S3103— 23 20 



