112 Bryant Walker 



PhYSA MARGARITA LcSSOn. 



Physa margarita Ivcsson, Rev. ZooL, 1840, p. 356. 

 Type locality: Newfoundland. 



* 



Fhysa mExicana conoidEa Fischer and Crosse. 



Physa mcxicana conoidca Fischer and Crosse, ^.loll. Alex., II, 1886, p. loi, 



pi. 39, figs. 8-8a. 

 Type locality : Mehedin, ]\Iexico. 



Also McLennan Co., Texas, see Strecker, 126, p. 64. 



Physa niagari^nsis Lea. 



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



1866, p. 168, pi. 24, fig. 97; Obs., XI, 1866, p. 124. pi. 24, fig. 97. 

 Type locahty: Niagara River, N. Y. 



Is referred to Integra by Tryon, (132, p. 167), but Crandall (27, p. 55) 

 considers it distinct. 



Physa nickunii Lea. 



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

 1866, p. 175, pi. 24, fig. loi ; Obs., XI, 1866, p. 131, pi. 24, fig. loi. 

 Type locality : Callaghan's, Alleghany Co., Va. 



Is ellipiica according to Tryon (132, p. 163) and Crandall (27, p. 55). 



Physa nuttalui Lea. 



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



1866, p. 171, pi. 24, fig. 93; Obs., XI, 1866, p. 127, pi. 24, fig. 93. 

 Type locality: Lewis River, Oregon. 

 See ampullacca. 



Physa occidKntalis Tryon. 



Physa occidcntalis Tryon, Am. J. of Con., I, 1865, p. 226, pi. 2, fig. 8. 

 Type locality: San Francisco and numerous other localities in California 

 and Oregon. 



Physa olkacEa Tryon. 



Physa olcacca Tryon, Am. J. of Con., II, 1866, p. 6, pi. II, fig. 6. 

 Type locality: Bridgeport, Ala., and Lake Superior. 



Is elliptica according to Tryon (132, p. 163L Crandall states {2"/, p. 45) 

 that Tryon himself admitted this obvious error and considers it to be a var. 

 of gyrina. Baker (5, p. 492) considers it to be simply an immature stage of 

 typical gyrina. 



