P. vermicularis of authors, (not of Gould=P. albus Miiller), 

 many California records. 



All North America south to Florida and northern Mexico. 



Los Angeles System : Santa Clara River, Montalvo, Santa 

 Clara River Valley (H. Hannibal). 



Reservoir in hills north of Soldiers' Home, Los Angeles 

 Coastal plain (H. Hannibal) ; swamp between Palms and Ci- 

 enaga (H. Hannibal) ; Compton Creek between Albicla and 

 Lynwood (H. Hannibal) ; (extinct) field near Domingues (H. 

 Hemphill) ; (Quaternary) Point San Pedro (D. and R. Arnold) 

 fide Arnold; Coyote Slough below S.P.R.R., between La 

 Mirada and AVestminster (H. Hannibal). 



Reservoir, mile north of Corona, Temescal Wash, upper 

 Santa Anna Basin (II. Hannibal) ; Lower Hemet Reservoir, 

 Hemet, San Jacinto Valley (II. Hannibal). 



Upper Hemet Reservoir, San Jacinto Mountains (II. Han- 

 nibal) ; pond, South San Jacinto Meadows (II. Hannibal). 



Reservoirs, La Mesa road four miles east of San Diego, 

 San Diego Mesa (H. Hannibal) ; La Mesa Reservoir (II. Han- 

 nibal) ; receiving reservoir, San Diego Flume, between La Mesa 

 and Lakeside (H. Hannibal). 



Arizona System: (semifossil) Indio, Colorado Desert (R. E. 

 C. Stearns) fide Stearns; (semifossil) Colorado Desert (Palmer 

 and Carlton) fide Stearns; (semifossil) New River, Laguna 

 (Mrs. C. Stevens). 



San Pedro River, Benson, Arizona (J. H. Ferriss) fide Pils- 

 bry and Ferriss. 



Planorbis Liebmanni Dunker in Chemnitz, (2 Ed.), 1850, 

 59, PL X, 32-34; P. gracilentus Gould, Proc. Bos. Soc. Nat. 

 Hist., V, 1855, 129; *P. liebmanni Biimey, L. & F. W. Shells X. 

 Am, 1865, 108, fig. 182-3. 



* A Mexican Species twice recorded from the Colorado Des- 

 ert. It is possibly cospecific with the West Indian S. havan- 

 ensis which would take priority. 



Southern Texas, Mexico. 



Arizona System: Colorado Desert (T. H. Webb) fide 

 Gould; (semifossil) New River, Laguna (E. A. Mearns) fide 

 Dall. 



Planorbis filocinctus Pilsbrv and Ferriss, Proc. Phila. Acad. 

 Nat. Sci., 1906, 165, PI. IX, 1-3. 



San Pedro River, Benson, Arizona (J. H. Ferriss) fide Pils- 

 bry and Ferriss. 



PHYSIDAE. 



Physa fontinalis (Linne). 



Bulla fontinalis Linne, Sys. Nat, "(10 Ed.), 1758, I, 727; 

 Lymnaea heterostropha Say, Nich. Encyc, (1 Ed.), II, 1817, PI. 

 I, 6; P. gyrina Say, Jour. Phila. Acad. Nat. Sci. II, 1821, 171 ; 

 P. lordi Baird, Proc. Zool. Soc. Lon. 1863, 68; P. politissima 

 Tryon, Am. Jour. Conch., I, 1865, 226, PI. XXIII, 13; *P. 



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