THE NAUTILUS. 77 



Lymncta palusiris nuttalliana (Lea). Creek and swamp at Bluff 

 Lake, altitude 7,000 feet, abundant [R. D. Williams, 1905 ; S. S. 

 B., 1907, 1908 ; N. G. S., 1909]. These specimens very uniform 

 in appearance. Bear Lake, intergrading with typical (?) palustris, 

 common [R. H. T., Aug., 1902 ; S. S. B., Aug., 1907, 1908]. 



Lymnaa humilis modicella (Say). On flower pots in greenhouses, 

 Redlands, abundant [S. S. B., 1904-'08]. 



Lymnaa caperata Say. A single very juvenile specimen col- 

 lected by Dr. Tremper in a pool in San Antonio Creek, 2 miles from 

 mouth [April 4, 1908], was identified as this species by Mr. F. C. 

 Baker. 



Lymnaa hulimoides Lea. Mojave River, near Daggett [Stearns, 

 '93]. 



Physa gyrina (Say) ? Redlands, in irrigating ditches; Garlick 

 Springs [Stearns, '93] ; Daggett [Stearns, '93]. 



I suspect that most if not all the Southern California records of 

 P. gyrina need re-examination, and the above will more than likely 

 prove to be varieties of P. virginea Gould. 



Physa lordi Baird. Artificial pond, Ontario, the water of which 

 comes from Hermosa Canon [R, H. T.]. Specimens of this fine 

 large species were sent to Mr. F. C. Baker, who agrees with me in 

 referring them to P. lordi. 



Physa virginea Gould. Ditches and reservoirs in Redlands, 

 common [S. S. B., 1907, 1908]. 



Physa virginea traski Lea. Main irrigating ditch of Ontario, 

 near mouth of San Antonio Canon, altitude 2,200 feet [R. H. T.]. 



Physa cooperi Tryon. Watering trough in City Creek Canon, 

 San Bernardino Mountains [S. S. B., Aug., 1907, July, 1908]; 

 Bear Lake, altitude 6,700 feet [S. S. B., Aug., 1907-'08]. 



Physa politissima Tryon. Bear Lake, altitude 6,700 feet, not 

 uncommon [S. S. B., 1907, 1908]. 



Dr. Pilsbry, to whom I sent "specimens of this and the preceding 

 species, and to whom I owe their determinations, wrote as follows : 

 "It should be said that the synonymy of West Coast Physas has never 

 been worked up, and the ultimate names which will be used cannot 

 now be decided, but your specimens correspond closely to the type 

 lots ot the forms mentioned, whether these be species or varieties." 



Planorhis trivolvis Say. England's Park, Redlands ; swamp 

 and creek at Bluff Lake [S. S. B., 1907, 1908; R. D. Williams, 



