136 



LAND AND FRESH WATER MOLLUSKS 



Range. Frances Lake and Finlayson Lake, Yukon District, Liard 

 River drainage (Dawson); Lake Michigan, 12 fathoms (Walker). 



Identified by Dr. Sterki, a species related to rhomboideum and occi- 

 dentale, but yet unfigured. 



Sphaerium solidulum Prime. 



Cyclas solidula PRIME, Proc. Boston Soc. Nat. Hist., iv, p. 158, 1851. 

 Sphcerium solidulum PRIME, Mon. Am. Corbie., p. 36, fig. 27, 1865. 



Range. Eastern United States, from New Mexico and Louisiana 

 to the Great Lakes, and Manitoba. 



In Manitoba, at Winnipeg, Brandon, and the Red River of the 

 North ; in Alberta, at Egg Lake. 



Sphaerium stamineum Conrad. 



Cyclas staminea CONRAD, Am. Journ. Sci., xxv, p. 342, 



pi. i, fig. 5, 1834. 

 Sphczrium stamineum PRICE, Mon. Am. Corbie., p. 38, fig. 



30, 1865. 



Range. Eastern United States, northward to FIG. 100. Sphcz- 

 Manitoba. 



Manitoba (Hanham). 



The type locality for this species is Alabama. In 1865 Mr. Prime 

 united with it the Cyclas fuscata of Rafinesque (Ohio) and the C. 

 bulbosa Anthony from Arkansas. Later collectors have found it 

 widely distributed over the eastern portion of the continent. 



Sphaerium rhomboideum Say. 



Cyclas rhomboida SAY, Journ. Acad. Nat. Sci. Phila., u, p. 380, 1822. 

 Cyclas elegans ADAMS, Boston Journ. Nat. Hist., in, p. 330, pi. in, fig. n, 



1840. 

 Sphcerium rhomboideum PRIME, Mon. Am. Corbie., p. 39, fig. 31, 1865. 



rium stamine- 

 um Conrad. 



101 102 103 



FiG. 101. Sphcerium rhomboideum Say. 



FlG. IO2. Sphcerium dentatum Hald. 



FiG. 103. Sphcerium fabale Prime. 



Range. New England to Michigan, and northwestward. 

 Lake Superior ; Manitoba at Pine Creek and in Lake Winnipeg. 



