154 



Unio donaciformis Lea. Wabash river; Ohio river. 



Unio dorfeuilliamis Lea. Ohio river. 



Unio ebenus Lea. Ohio and Wabash rivers. 



Unio elegans Lea. Wabash and Ohio rivers. 



Unio ellipsis Lea. Ohio and Wabash rivers. 



Unio fabalis Lea. Ohio river. 



UniofoUatus Hildreth. Ohio river. 



Unio fragosus Conrad. Wabash and Ohio rivers. 



Unio gibbosus Barnes. Lakes in northern Indiana; Ohio, White and 

 Wabash rivers. 



Unio glans Lea. Ohio and White rivers ; lakes in northern Indiana. 



Unio gracilis Barnes. Ohio river. 



Unio graniferus Lea. Ohio river. 



Unio heros Say. Wabash river. 

 = Unio multiplicatus. Lea. 



Unio iris Lea. St. Joseph's, White and Ohio rivers; lakes in northern In- 

 diana. 



Unio irroratvs Lea. White and Ohio rivers. 



Unio lachrymosus Lea. Ohio river. Unio asperrimus Lea is a synonym of 

 this form. 



Unio liemsimus Lea. White and Ohio rivers. 



Unio lens Lea. Canal, Indianapolis ; Ohio river. 

 = Unio cir cuius Lea. 



Unio ligameniinus Lamarck. Wabash and Ohio rivers. 



Unio luteolus Lamarck. Lakes in northern Indiana ; Ohio river. Probably 

 generally distributed. 



Unio metanevrus Rafinesque. Wabash, White and Ohio rivers. 



Unio muUiradialus Lea. Canal, Indianapolis ; White river. 



Unio multiplicatus Lea. Ohio and Wabash rivers. 



Unio mytiloides Ratinesque. Ohio and Wabash rivers. 



Unio nasutm Say. Lakes in northern Indiana. Only in those which drain 

 into the Great lakes. 



Unio obliquus Lamarck. Ohio and Wabash rivers. 



Unio occidens Lea. Ohio river. 

 = Unio ventricosus Barnes. 



Unio orbieulatus Hildreth. Ohio and Wabash rivers. See Unio abrnptus 

 Say. 



