1922] 



NATURAL SCIENCES OF PHILADELPHIA 



99 



Two small specimens of this widespread species were taken 

 under sticks at the margins of a springy spot at Station XVI in 

 Palm Canyon. 



PHYSIDAE 



Genus PHYSA Draparnaud 1901 



Physa sp. 



Specimens of a small Physa, which I have not ventured to deter- 

 mine specifically, were found at three stations in Palm Canyon: 

 dead in the drift at Station XII, living among algae in Little 

 Palm Creek (Station XIII), and in a spring at Station XV farther 

 down the main canyon. At this last point they were noted to 

 be quite abundant. 



AMINICOLIDAE 

 Genus PALUDESTRINA d'Orbigny 1S41 



Paludestrina longinqua (Gould 1855) 



1855. Amnicola longinqua Gould, Proc. Bost. Soc. Nat. Hist., vol. 5, p. 130. 

 1857. Amnicola longinqua Gould, Pac. R. R. Rep., vol. 5, p. 333, pi. 11, fig. 



10-11. 

 1899. Paludestrena longinqua Pilsbry, Nautilus, vol. 12, p. 122. 



A single minute shell tak- 

 en in the drift of Palm Can- 

 yon at Station XII has some- 

 what the aspect of a small 

 Amnicola, but is probably 

 merely a juvenal of the wide- 

 spread P. longinqua, so com- 

 mon in the semi-fossil state 

 in the Cahuilla Basin, and 

 known living from various 

 localities in the Cuyamaca 

 Mountains and elsewhere. A 



camera drawing of the pres- _ Fi S 5 - Paludestnna longinqua (Gouid)? 

 ... . , Camera outline of juvenal shell from Sta- 



ent specimen is appended. tion XII, Palm Canyon, California. 



