142 



priority, even though it is now recognized that the species falls in Marc/aritana 

 rather than in Unio. 



In habit the species resembles Margaritana dehi'icens in that it is often deeplv 

 buried in the gravelly banks it affects, in rather swiftly flowing water. Most 

 commonly, however, it may be found buried deeply under large Hat rocks, and 

 between clefts in rocky bottoms. It is a rather rare shell in collections. 



* Margaritana rugoaa Barnes. 



Wabash River, White River, Blue River. Fourteen Mile Creek. 



* Unio a'sopus Green. 



Wabash River, Ohio River. 



* Unio alatus Say. 



White River, Ohio River, Wabash River. 



* Unio anodont aides Lea. 



W^abash River, Ohio River, Bruisett's Creek, Vigo County. 



* Unio asperrimus Lea. 



Wabash River, Ohio River, at the Falls; this form is equivalent to Unio 

 laihrymosus Lea. 



* Unio camelus Lea. 



Ohio River ; this is an old and heavy Unio phaseohm. of which it is a 

 synomym, 



* Unio camptodon Say. 



W^abash River, Ohio River. 



* Unio capax Green . 



Wabash River, Ohio River. 



* Unio cicatricosvs Say. 



Wabash River, Ohio River. 



* Unio circulus Lea. 



St. Mary's River, Ohio River, Wabash River, Peru. 



* Unio clavus Lamarck. 



Wabash River, very abundant ; St. Joseph River. 



* Unio coceineus Hildreth. 



Wabash River, Ohio River. 



* Linio cooperianus Lea. 



Wabash River, Ohio River. 



* Unio cornutus Barnes. 



Ohio River, Wabash River. 



