CATALOGUE OF UNIOS, ETC 13 



No. 39. UniO planus, Barnes, 

 leptodon, Raf. 

 velum, (female,) Say. 

 Ano. purpurascens, Swainson. 

 tenuissimus, Lea. 



No. 40. Unio plicatus, 8ay. 

 costata, Raf. 

 Tariplicata, Lam. 

 undulatus, Desh. 



No. 41. Unio politus, Say. 



subrotundus, Lea. 



No. 42. Unio pustulosus. Lea. 



verrucosus albus, Hild. 



No. 43. Unio Rangianus, Lea. 



No. 44. Unio rectus, Lam. 



prselongus, Barnes, 

 latissima, Raf. 



No. 45. Unio retusus. Lam. 

 torsa, Raf. 



