ii6 Bryant Walker 



Physa white;i Lea. 



Physa whitei Lea, Pr. A. N. S. P., 1864, p. 114; Jour. A. N. S. P., VI, 1866, 



p. 172, pi. 24, fig. 96; Obs., XI, 1866, p. 128, pi. 24, fig. 96. 

 Type locality : Walker Co., Ga. ; Verdigris River, Kans. 

 Is forsheyi according to Crandall {2y, p. 69). 



Pfiysa wol^iana Lea. 



Physa wolfiana Lea, Pr. A. N. S. P., 1869, p. 125; Jour. A. N. S. P., VIII, 



1874, p. 63, pi. 21, fig. 20; Obs., XIII, 1874, p. 67, pi. 21, fig. 20. 

 Type locality : Hot Springs, Colo. 



Genus APLEXA Fleming, 1822. 

 Aplexa hordacea (Lea). 



Physa hordacea Lea, Pr. A. N. S. P., 1864, p. 116; Jour. A. N. S. P., VI, 

 1866, p. 176, pi. 24, fig. 102; Obs., XI, 1866, p. 132, pi. 24, fig. 102. 

 Type locality : Vancouver Island, Oregon. 



Referred to Aplexa by Tr}^on (132, p. 170), and doubtfully by Dall 

 (32, p. 113), but its generic position still remains to be definitely settled by 

 an examination of the animal. Dall (1. c.) states that the types came from 

 Vancouver, Wash, and not from Vancouver Island, B. C. 



Is a variety of P. venusta Lea according to Cooper (25, p. 97). 



Aplexa hypnorum L. 



Clessin (20, p. 287) distinguishes the American form {P. elongata Say) 

 on the ground that the European form has a more slender shell and never 

 a short spire as is the case with both the American varieties recognized by 

 him, but the concensus of opinion is against him. 



Aplexa piypnorum arctica (Clessin). 



Physa elongata arctica Clessin, Con. Cab., Limn^iden, 1886, p. 287, pi. 41, 



H- 5- 

 Type locality: Hudson Bay. 



Aplexa hypnorum glabra (DeKay). 



Physa glabra DeKay, N. Y. Moll, 1843, P- 80, pi. 5, fig. 83. 

 Physa elongatina Lewis, Pr. B. S. N. H., V, 1855, PP- 122, 298. 

 Range: Conn., N. Y., and Michigan. 



This form seems to be entitled to recognition as a well marked race. 



Aplexa hypnorum tryoni (Currier). 



Bulinus tryoni Currier, Am. J. of Con., Ill, 1867, p. 112, pi. 6, fig. 2. 

 Type locality : Grand Rapids, Mich. 



