143 



•• Unio crassiclens Lamarck. 



Wabash River, Falls of the Ohio, abundant. 

 '■'TJnio cylindricus Say. 



Ohio Eiver, Wabash River, White River. 



These shells, as are indeed most others from the Wabash River, are singularly 

 beautiful and perfect. Even the largest and oldest examples present perfect um- 

 bones, with epidermis and apical crenulations entire. It is rare indeed to find 

 these forms so perfect. Both this species and Unio metanervns, which are charac- 

 terized by peculiar arrow-shaped green color-markings over the whole disk, pre- 

 sent this feature in singular beauty. The State Collection, at Indianapolis, con- 

 tains several well-marked and beautiful specimens. 



* Unio donaciformis Lea. 



Wabash River, Ohio River at Falls of the Ohio; found, also, in collections 

 under the name of Unio zigzag Lea. The latter name was given two 

 years after Unio donaciformis was characterized. 



* Unio ebenus Lea. 



Wabash River, Ohio River, Falls of the Ohio. 



* Unio elegans Lea. 



Wabash River. Ohio River, Falls of the Ohio. 



* Unio ellipsis Lea. 



Wabash River, Ohio River, Falls of the Ohio, common. 



* Unio fahalis Lea. 



Wabash River. 



Unio lapillus Say, is a synonym of this form. 

 *Uniofragosus, Conrad. 



Wabash River, Ohio River, White River. 

 ■•■ Unio gibbosus Barnes. 



Wabash River, Sand Creek, Ohio River, Turkey Lake, Lake Tippecanoe, 

 St. Joseph River, Lake Maxinkuckee, Falls of the Ohio, St. Mary's 

 River. 

 The white and heavy variety of this shell, called by Dr. Lea, Unio arclior, 

 occurs somewhat commonly in both the Ohio and Wabash rivers. 

 ■■•■ Unio glans Lea. 



Wabash River, White River, Lake Maxinkuckee. 



* Unio gracilis Barnes. 



Wabash River, Ohio River on Falls of the Ohio, Muscatatuck Creek, Jen- 

 nings County. 



