SYSTEMATIC INDEX 



OF 



THE SHELLS DESCRIBED IN MR LEA'S MEMOIR. 



Unio arctior 



Barnesianus 



Bengalensis 



Brownianus 



carbonarius 



Claibornensis 



coccineus 



contradens 



creperus 



Cumberlandicus 



discus 



dolabraeformis 



Dorfeuillianus 



Fisherianus 



foUiculatus 



gibber 



glaber 



graniferus 



Hopetonensis - 



Hydianus - 



interruptus 



Jayensis 



jejunus 



lamellatus - 



Lecontianus 



lugubris 



Medellinus 



Menkianus 



Pace 





Page 



10 



Unio Muhlfeldianus 



- 41 



31 



notatus 



28 



3 



Novi-Eboraci 



- 104 



108 



obscurus - 



7 



37 



pliciferus 



. 61 



105 



puicher 



6 



12 



pumilus 



- 23 



75 



Rangianus 



95 



33 



Roanokensis 



- 27 



25 



simus 



26 



74 



splendidus 



- 70 



103 



spinosus - 



57 



73 



solidus 



- 13 



8 



Tampicoensis 



24 



38 



Tappanianus 



- 62 



35 



turgidus 



11 



34 



Vanuxemensis 



- 36 



69 



Vaughanianus 



5 



29 



venustus 



4 



14 



Zeiglerianus 



32 



15 



Margaritana arcula - 



- 71 



28 



deltoidea 



43 



9 



fabula - 



- 44 



19 



Holstonia -- 



42 



40 



Anodonta angulata 



- 97 



30 



Buchanensis - 



47 



39 



cylindracea 



- 45 



76 



decora 



64 



