SYSTEMATIC INDEX 



THE SHELLS DESCRIBED IN MR LEA'S MEMOIRS; 



VOLUMES III., IV. AND V. 



Unio acutissimus - 

 anodontoides 

 angustatus 

 arcaeformis 

 asper 



asperriinus 

 ater 



Blandingianus 

 brevidens 

 Burroiigliianus 

 calceolus 

 camelus 

 capillaris 

 capsaeformis 

 castaneus 

 circulus 

 cosruleus 

 Congaraeus 

 confertus 

 Coiiradicus - 

 Cooperianus 

 Corrianus 

 cuprinus 

 decisus 

 divaricatus 

 donaciformis 

 dromas 

 ebenus 

 elegans 

 ellipsis 

 emarginatus 

 fabalis 



