Il8 LAND AND FRESH WATER MOLLUSKS 



These northern localities are cited from the literature. I have seen 

 no Manitoban specimens. 



Amnicola emarginata KUster. 



Paludina obtusa Lea, Proc. Am. Phil. Soc, il, p. 34, 1841, not of Troschel, 



1837. 

 Pahidina emarginata Kuster, Conch. Cab., ed. II, Men. Paludina, p. 50, pi. 



X, figs. 3, 4, 1852. 

 A?nnicola cincinnatiensis Binney, Land and Fw. Sh. N. Am., Ill, p. 85, fig. 



169, 1865, not of Anthony ? 



Ratigc. — Ohio and northward to Moose River, Hudson Bay. 



Red River of the North ; Manitoba ; lower Sas- 

 katchewan, near Lake Winnipeg ! Moose Factory ! 

 N. Lat. 51° on Hudson Bay. 



More or less confusion has existed between the va- 

 rious shells which have carried the specific name cin- 

 cinnatiensis in this familj'. The present species is 

 Fig. 86. Am- the small shell with a flat planorboid apex which has 

 nicola emargi- usually been called Bythinella obtusa Lea. Baker, 

 na a us er .^^ j^.^ Mollusks of the Chicago Area, unites cincin- 

 (magnified). . . „. .... . 



natiensis Bnmey with this species, it does not seem 



to me to resemble the obtusa of Lea, particularly. 



Amnicola cincinnatiensis Anthony. 



Paludiita I inchinatif nsis AiilHOtiX, Boston Journ. Nat. History, III, p. 279, pi. 



Ill, fig. 3, 1840. 

 Amnicola (^Cmcinnatid) cincinnatiensis'^PJfXVi, Moll. Chicago 



Area, 11, p. 325, pi. xxvi, fig. 14, 1902. 



Range. — New York to Utah, Texas to Hudson 

 Bay. Moose Factory, Hudson Bay ! F1G.87. ^,«- 



_, ., . riTTi T1 ■ • ntcola ciitciitnat- 



The identity of the Hudson Bay sjjecimcns is ap- . . 

 parently indubitable. The species is asserted by Pils- 

 bry to occur in Texas and at various points in the basin of Great Salt 

 Lake, Utah. 



Genus Lyogyrus Gill. 

 Lyogyrus granum Say.' 



Paludina grana ?>AM , Journ. Acad. Nat. Sci. Phila., 11, p. 378, 1822. 

 Amnicola granum Haldem.'^n', Mon. Limn., viii, p. 17, 1845. — Binney, 

 Land and Fw. Sh. N. Am., iii, p. 86, fig. 170, 1865. 



Range. — Virginia northward to the Great Lakes and Manitoba.' 

 Pennsylvania (Say). Pine Creek, Manitoba (Miller Christy). 



Dr. Pilsbry, in the Nautilus (xii, No. 4, p. 42, 189S), says that the 

 Canadian and northwestern specimens are not of the same species as 



