NORTH AMERICAN CONCHOLOGY. 29 



[Chenu, Biblioth&que Conchyliologique.] 

 Page. PI. Fig. Name. 



Sub-genus Aximedia. 



13 Unio elliptica Raf, 



13 i 11-13 levigata Raf. 



13 zonalis Raf. 



Sub-Genus Eprtnia. 



13 Unio dilatata Raf. 



18 i 14-15 latissima R.af. 



13 solenoides Raf. 



13 var. interrupta Raf. 



13 nodosa Raf. 



13 * cylindrica Say. 



Genus LAMPSILIS. 



14 i 16-19 Lampsilis cardium Raf. 



Unio cardium Raf. 

 14 ovata Say. 



Unio ovatus Say. 

 14 fasciola Raf. 



14 rosea Raf. 



14 pallida Raf. . 



Genus METAPTERA. 



15 i 20-22 Metaptera megaptera Raf. 



Unio mei/a])tera Raf. 

 15 ochraceus Say. 



Unio ochraceus Say. 

 15 cariosua Say. 



Unio cariosus Say. 



Genus TRUNCILLA. 



15 ii 1-4 Truncilla triqueter Raf. 



Unio triqueter Raf. 



16 truncata Raf. 



Unio truncata Raf. 

 16 var. fusca Raf. 



16 vermiculata Raf. 



Genus OBLIQUARIA. 

 Sub-Genus Plagtola. 



16 Obliquaria decorticata Raf. 



Unio decorticata Raf. 



