FAMILY I'llYSID^ I03 



villc, Wash. ! Lake Osoyoos, Lat. 49° and Kootenai Lake, IJriiish 

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

 feet ! 



1 liiid this remarkable species in the National collection labelled P. 

 parkeri Currier. Tliere 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. lordl, 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 Tryon. 



/'/n'sa p>v//iiifua Tryos, Am. Journ. Conch., I, p. 223, pi. 23, fig. 5, 1865 ; 

 Men. 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 Soimd drainage ! Sumas Prairie, Fraser River valley, 15ritish 

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

 the Cascades. 



This form closely resembles P. hctcrostropha Say, and is the sIkII 

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

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

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

 aiiip7illacea 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. 



P/iysii hullala GouLD, I'roc. 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 Sounil on 

 the Pacific Coast. 



Oregon! Lake Oyosa, W^ashingtoii ! 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 Lf.a, 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. 



