Segmentina liebmanni (Dunker) () 



Segmentina filocincta (Pilsbry and 



Ferriss I K 



Physa fontinalis acuta (Draparnaud) . . <> () 



Paludestrina protea (Gould) <> X 



Paludestrina longinqua (Gould) 



Valavata tricarinata (Say) - 



The Arizona fauna embraces fourteen species of which 

 eleven occur in the California!) Province proper, eight are com- 

 mon to the Los Angeles System, while six of these enter into 

 the Mexican fauna. One Mexican species enters this System, 

 while two species are peculiar. 



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Margaritana margaritifera falcata (Gould) ... 



Anodonta cygnea ( Linne) X I 



Anodonta cygnea impura ( Say ) 



• Gonidea angulata ( Lea) 



Gonidea angulata haroldiana (Dall) 



Sphaerium simile ( Say I ? 



Musculium lacustre ( Muller) 



Musculium partumeium (Say) ■ 



Corneocyclas compressa (Prime) O L 



Corneocyclas pulchella (Jenys) : . . 



Lymnaea stagnalis ( Linne) L 



Lymnaea palustris ( Muller) < > 



Lymnaea solida ( Lea) 



Lymnaea solida cubensis ( Pfeiffer) O 



Lymnaea truncatula (Muller ) 



Lymnaea sp. nov K 



Planorbis trivolvis ( Say I O 1 1 



Segmentina parva ( Say ) 



Segmentina dilatata (Gould i 



Segmentina alba (Muller) L 



Pompholyx effusa ( Lea I L 



Pompholyx newberryi ( Lea I L 



Gundlachia fragilis (Tryon) K 



Physa fontinalis ( Linne ) 



Physa fontinalis acuta (Draparnaud) O 



Elimia plicifera ( Lea ) L 



Paludestrina protea (Gould l X X 



Paludestrina longinqua (Gould I O 



Valvata tricarinata ( Say I — 



"Vivipara" malleatus ( Reeve I I 



"Vivipara" japonica | Martyn i I 



37 



