FAMILY PHYSID^E IO3 



ville, Wash. ! Lake Osoyoos, Lat. 49 ° and Kootenai Lake, British 

 Columbia; San Rafael, Valencia Co., New Mexico; altitude 6,000 

 feet! 



I find this remarkable species in the National collection labelled P. 

 parkeri Currier. There is a form very similar in miniature to this, 

 which occurs in the Gila River, Arizona, and elsewhere in that region, 

 but, while this may be a dwarf form of P. lordi, I do not feel suffi- 

 ciently certain to include it in the range of the latter. The Michigan 

 specimens however are typical, and finely developed, not in any way 

 to be distinguished from those collected in Washington. 



Physa propinqua Try on. 



Physa propinqua Tryon, Am. Journ. Conch., l,"p. 223, pi. 23, fig. 5, 1865 ; 

 Mon. Fw. Univ., Moll. U. S., pt. 3, p. 132, pi. VI, fig. 13, 1872. 



Range. — Jordan Creek, SW. Idaho, west to Puget Sound and 

 south to Los Angeles, Calif. 



Puget Sound drainage ! Sumas Prairie, Fraser River valley, British 

 Columbia, and elsewhere in the lowlands of British Columbia, east of 

 the Cascades. 



This form closely resembles P. heterostropha Say, and is the shell 

 which has been listed by that name from the Pacific Coast, where ac- 

 cording to Tryon and Crandall the true P. heterostropha does not 

 occur. Whether it is a distinct species, or a special mutation of P. 

 ampullacea Gould, or a western race of some other species, I do not 

 feel able to determine, and so I accept Tryon's assurance that it is a 

 valid species. 



Physa ampullacea Gould. 



Physa bullata Gould, Proc. Boston Soc. N. Hist., v, p. 128, 1855 ; not of 



Potiez et Michaud, 1838. 

 Physa ampullacea Gould, in Binney, Land and Fw. Sh. N. Am., 11, p. 79, 



figs. 134, 135 (not 133), 1865. 



Range. — Oregon and Washington, northward to Norton Sound on 

 the Pacific Coast. 



Oregon ! Lake Oyosa, Washington ! Vancouver Island, near Vic- 

 toria ; ponds near St. Michael, Norton Sound, Alaska, rare ! 



A single specimen of what seems to be this species was found among 

 other shells collected near St. Michael, Alaska, by E. W. Nelson. 



Physa (Aplexa?) hordacea Lea. 



Physa hordacea Lea, Proc. Acad. Nat. Sci. Phila., for 1864, p. 116; Journ. 

 Acad. Nat. Sci. Phila., (2), vi, pp. 176, 177, pi. xxiv, fig. 102, 1866; 

 Obs. Gen. Univ., xi, pp. 132-3, pi. xxiv, fig. 102, 1866. 



