UN10. 



495 



Srnitbii, Gray. 

 spatulatus, Lea. 

 splendidus, Lea. 

 stagnalis, Conr. 

 Stonensis, Lea. 

 straruineus, Conr. 

 subangulatus, Lea. 

 Tampicoensis, Lea. 



Tecomatensis, Lea. 

 tener, Lea. 

 Tennesseensis, Lea. 

 Vanuxeniensis, Lea. 

 ventricosus, Barnes. 

 venustus, Lea. 

 vibex, Conr. 

 Zeiglerianus, Lea. 



Sub-gen. lampsilis, Rafinesque (Truncilla, Pleurobema, Syn- 

 toxia, Scalenaria, Plagiola, Bajin. Unio, Lam., not Bete. 

 Crenodonta, Schlut. iEglia, Swains.). 



Shell not winged, more or less triangular or oblique, and 

 truncate at one end ; surface of valves smooth. 



abacus, Hald. 

 arcaeforrnis, Lea. 

 argenteus, Lea. 

 Barnesianus, Lea. 

 Bigbyensis, Lea. 

 Bournianus, Lea. 

 camelus, Lea. 

 castaneus, Lea. 

 clavus, Lam. 

 compressissimus, Lea. 

 cor, Conr. 

 crassidens, Lam. 

 cuneolus, Lea. 

 cyreuoides, Phil. 

 decisus, Lea. 

 donaciformis, Lea. 

 Edgarianus, Lea. 

 elegans, Lea. 

 ellipsis, Lea. 

 Estabrookianus, Lea. 

 Forbesianus, Lea. 

 Foremanianus, Lea. 

 fulgidus, Lea. 



gibber, Lea. 

 Hanleyianus, Lea. 

 Haysianus, Lea. 

 heterodon, Lea. 

 Holstonensis, Lea. 

 incrassatus, Lea. 

 maculatus, Conr. 

 mytiloides, Bajin. 

 obliquus, Lain. 

 Orbignyii, Lev. and Hup. 

 ovatus, Say. 

 oviformis, Conr. 

 patulus, Lea. 

 penitus, Conr. 

 pileus, Lea. 

 plenus, Lea. 

 pulvinulus, Lea. 

 pumilis, Lea. 

 pyramiclatus, Lea. 

 Rajahensis, Lea. 

 Rangianus, Lea. 

 Ravenelianus, Lea. 

 rubiginosus, Lea. 



