SYSTEMATIC INDEX. 



Unio acutissimus - 



anodontoides 



angustatus 



arcaeformis 



asper 



asperrimus 



ater 



Blandingianus 



brevidens 



Burroughianus 



calceolus 



camelus 



capillaris 



capsasformis 



castaneus 



circulus 



cceruleus 



Congaraeus 



confertus 



Conradicus - 



Cooperianus 



Corrianus 



cupriiius 



decisus 



divaricatus 



donaciformis 



droraas 

 - ebenus 



elegans 

 ' ellipsis 



emarginatus 



fabalis 



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