NORTH AMERICAN CONCHOLOGY. 



157 



Unio leevissimus Lea. 



Symph. Iscvissima Lea. 

 lapillus Say. 



U. fabalis Lea. 

 monodontus Say. 



U. soleniformis Lea. 

 multiradiatus Lt a. 

 U. fasciola ? Raf. 

 nodosus Barnes. 



U. metanevrai Raf. 

 nodulatus Raf. 



U. pustulatus Lea. 

 ovatus Say. 

 parvus Barnes. 

 perplexus Lea. 



U. gibbosa ? Raf. 

 personatus Say (female). 

 U. capillaris Lea (fern.) 

 pili us Lea (male). 

 phaseolus IlilJr. 

 U. planulatus Lea. 

 camelua Lea. 

 planus Barnes. 

 U. leptodon Raf. 



velum Say (female). 

 Anod purpurascensSwain. 

 U. tenuissimus Lea. 

 plicatus Say. 

 U. costata Raf. 

 rdriplicata Lam. 

 undulatus Desk, 

 politus Say. 



U. subrotundus Lea. 

 pustulosus Lea. 



U. verrucosus albus Hild. 

 Rangianus Lea. 

 rectus Lam. 



U. preelongus Barnes. 

 latissima Raf. 

 retusus Lam. 

 U. torsa Raf. 

 rugOBUS Barnes. 

 U. quadrula? Baf. 

 lachrymosus Lea. 

 asperrimus Lea. 



