The fauna of the Coast Range System which embraces the 

 Coastal Drainage from Mad River to Point Conception, the San 

 Francisco Bay region, Sacramento-San Joaquin Valley, and 

 west slope of the Sierra Nevada Mountains south of Yosemite 

 Valley, is extensive and typically Californian, consisting of 

 twenty-two species and subspecies of which ten extend into 

 and become part of the fauna of the Los Angeles System that 

 adjoins it on the south. 



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Mojave System. 



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>> 



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S § < 



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Anodonta cygnea impura (Say) 



Sphaerium simile ( Say ) ? 



Musculium lacustre (Muller) 



Corneocyclas compressa (Prime) L 



Corneocyclas pulchella (Jenys) 



Corneocyclas sp. nov K 



Lymnaea palustris (Muller) 



Lymnaea solida cubensis (Pfeiffer) 



Lymnaea truncatula (Muller) 



Planorbis trivolvis (Say) 



Segmentina parva (Say) 



Segmentina dilatata (Gould) 



Pompholyx effusa (Lea) X 



Pompholyx newberryi (Lea) 



Physa fontinalis acuta (Draparnaud) 



Amnicola micrococcus (Pilsbry) K 



Paludestrina protea (Gould) X 



Paludestrina longinqua (Gould) 



Flumnicola merriami (Pilsbry and Beecher) K 



Flumnicola erythropoma (Pilsbry) K 



Valvata tricarinata (Say) 



The Mojave System which embraces the Mojave Desert, 

 Bear Valley (San Bernardino Mountains), Owens Valley, Death 

 Valley, and the adjacent desert regions of southern Nevada and 

 south-western California, contains a fauna of some twenty 

 species and subspecies noted for its peculiar operculates. Eight 

 species extend westward into the Los Angeles System and 



eleven south into the Arizona. 



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Colorado System. 



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03 



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03 



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 O .N 



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Anodonta cygnea impura (Say) 



Sphaerium simile (Say) 



Corneocyclas compressa (Prime) 



38 



