SYSTEMATIC INDEX. 



Unio affinus, . 

 Barrattii, 

 buxeus, . 

 Clarki.inus, 

 concavus, 

 Cuvierianus, 

 decoralus, 

 Floridensis, 

 Forbesianus, 

 fraternus, 

 Gibbesianus, 

 hebes, . 

 Hanleyianus, 

 ineptiis, . 

 Ingallsianus, 

 Keinerianus, 

 Kleinianus, 

 Lamarckianus, 

 Lazarus, 

 luridus, 

 merus, . 

 Moussonianus, 

 nigellus, 

 nigerrimus, 

 nigrinus, 

 nux, 



Oregonensis, 

 perslriatus, 

 placitus, 

 Powellii, 

 Prevoslianiis, 

 proximus, 

 pygmsEHS, 

 Reeveianus, 

 rufusculus, 



Pajre 



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