CATALOGUE OF UNIOS, ETC 



No. 23. UlliO gibbOSUS, Barnes, 

 nasutus, Lam. 

 (lilatata, Raf. 

 arctior, (white nacre,) Lea. 



No. 24. Uiiio glans, Lea. 



No. 25. IJlliO g^racilis, Barnes, 

 symph. gracilis, Lea. 



No. 26. Unio iris, Lea. 



subrostratus 1 Say. 



No. 27. Unio irroratus, Lea. 

 stegaria 1 Raf. 



No. 2S. Unio Isevissimus, Lea. 

 symph. laevissiraa, Lea. 



No. 29. Unio lapillus, Say. 

 fabaUs, Lea. 



No. *dO. Unio monodontus. Say. 

 soleniformis, Lea. 



