74 LAND AND FRESH WATER MOLLUSKS 



Limnea galbana HALDEMAN, Mon. Limn., p. 51, pi. xm, figs. 22, 23, 



1842. 

 Limncea philadelphica LEA, Proc. Am. Phil. Soc., n, p. 32, 1841 ; Trans. 



Am. Phil. Soc., ix, p. 8, 1844. BINNEY, Land and Fw. Sh. N. Am., 



II, p. 50, fig. 71, 1865. (Philadelphia, Pa.) 

 Limncea traski TRYON, Proc. Acad. Nat. Sci. Phila., for 1863, p. 149, pi. i, 



fig. 13, 1863. BINNEY, Land and Fw. Sh. N. Am., n, p. 60, fig. 94, 



j865. TRYON, Mon. Limn., p. 119, pi. 17, fig. 3 (not p. 96, nor fig. 2), 



1872. (Mountain Lake, near San Francisco, Calif.) Not L. traskii Lea, 



1864, nor L. proximo. Lea, 1856. 



Range. Pleistocene marls of Franklin, New Jer- 

 sey ; of Anticosti Island ! of Ottawa, Canada ! and of 

 the left bank of the Yukon River, Alaska, below old 

 Fort Yukon ! Recent, at the Grand Rapids of the 

 Saskatchewan River, near Lake Winnipeg ! Grind- 

 stone Creek, Nebraska ! Centre City, Pennsylvania ! 

 n<za galbana ' 



Say var. phila- Vancouver, Columbia River ! and near Monterey, 



delphica Lea. California ! Alaska (von Martens) ; Attawapiskat 



River, S. E. Keewatin ! (Mclnnes). 



This small species has the spire acute and short, the last whorl dis- 

 proportionately swollen and usually shouldered. It appears to have 

 flourished during the melting of the glacial ice, and to the muddy 

 waters of the period its peculiarities may be due. The recent form 

 seems less abnormal on the average. 



There are two species which have been called traskii the pres- 

 ent one, with which Try on afterward mistakenly united L. proxima 

 Lea, a much larger species ; and L. traskii Lea, later 

 called tryoni and tryoniana by Dr. Lea, which is a 

 Stagnicola. 



Lymnaea (Galba) holbolli (Beck) Moller. FlG 53 Lym . 



Limncea (Limnophysa) holbolli BECK, Index, p. in, 1838 ; ncea holbolli. 



nude name. Greenland. 



Lymnoea holbolli MOLLER, Index, Moll. GronL, p. 5, 1842. 

 Limncea holbolli MORCH, Am. Journ. Conch., iv, p. 36, pi. iv, fig. 8, 1868. 



Range. Godhaab, Greenland. 



This has the appearance of a large L. truncatula, but may be merely 

 a depauperate variety of the next species. 



Lymnaea (Galba) vahlii (Beck) Moller. 



Limncea ^Limnophysa) vahlii BECK, Index, p. in, 1838; nude name. 



Greenland. 



Limncea -vahlii MOLLER, Index, Moll. Gronl., p. 4, 1842. 

 Limncea (Limnophysa) vahlii MORCH, Am. Journ. Conch., iv, p. 34, pi. iv, 



figs. 1-7, 1868. 



