SYSTEMATIC CATALOGUE OF SPECIES. 



Class PELECYPODA. 



Order PRIONODESMACEA. 



Superfainily Naiadacea. 



Family UNlONIDyE. 



HETEROGENiE. 



Genus Truncilla Rafinesque. 

 Subgenus Truncilla Rafinesque. 

 Truncilla irlquetra Rafinesque {^triangularis Lea). 



Northern Illinois (Oalkiiis) ; Will Co. (Ferriss); Kankakee 

 River; Illinois River (Handwerk) ; La Salle Co. (Huett); 

 Wabash River (Marsh) ; Athens, Menard Co. (Nason) ; Southern 

 Illinois (Ultfers) ; Fulton Co. (Wolf). 



vSubgenus Scalenaria (Rafinesque) Agassiz. 

 Truncilla sulcata Lea. 



Ohio River (Marsh). 



Subgenus Dysnomia Agassiz. 



Truncilla foliata Hildreth. 



Ohio River (Marsh) ; Southern Illinois (Ulft'ers). 



Subgenus Pilea Simpson. 



Truncilla perplcra Lea. 



Wabash River (Hinkley) ; Ohio River (Marsh) ; Southern 

 Illinois (Ultfers). 



Truncilla perple.va ranglana Lea. 



Illinois (Call); Wabash River (Marsh) ; Southern Illinois 

 (Umers). 

 Truncilla propinqua Lea. 



Ohio River (Marsh). 

 Truncilla personata Say ( = pileus Lea). 



Southern Illinois (Ultf'ers). 



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