SUMMARY OF THE FAUNA. 



The faunas may be summarized as follows 



* £ 



V 



Los Angeles System* | 2 * 



o £ g rt 



*0 — present, K — characteristic, L — local ft« « I g 

 only, I — introduced, X — extinct. .5 u "5 « £ 



c« » o »j rt 



o j < n 



Anodonta cygnea (Linne) I 



Anodonta cygnea impura (Say) O 



Gonidea angulata (Lea) 



Gonidea angulata haroldiana (Dall) . . . 



Sphaerium simile ( Say ) ? 



Corneocyclas compressa (Prime.) O L 



Corneocyclas pulchella ( Jenys) OOOO 



Lymnaea solida cubensis (Pfeiffer) 



Lymnaea truncatula (Midler) O L 



Planorbis trivolvis (Say) 



Segmentina parva ( Say) 



Physa fontinalis acuta (Draparnaud) .. . 



Paludestrina protea (Gould) O X 



Paludestrina longinqua (Gould) 



Valvata tricarinata (Say) 



Of this list ten species may be regarded as constituting an 

 integral part of the fauna. All of these occur in the Califor- 

 nia Province proper, eight in the Arizona System, while five 

 of wide distribution range south into Baja California. 



Arizona System. | 



E 



2 E S» e 



S >> — ■ 



g ° 5 Cm 



p9 S < o 



60 W 



c - 



■3* 5 S § 



O <U M XIX 



Anodonta cygnea impura (Say) 0000 



"Anodonta" dejecta (Lewis) K 



Sphaerium simile (Say) ? 



Corneocyclas compressa (Prime) L 



Corneocyclas pulchella (Jenys) 0000 



Lymnaea solida cubensis (Pfeiffer) 



Lymnaea truncatula (Midler) L 



Planorbis trivolvis (Say) 



Segmentina parva (Say) L 



o 



(5 



