CATALOGUE. 



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No. 1. Unio abruptus, Say. 



orbiculatus, Hildreth. 



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 NO. 2. UniO JEsopUS, Green. 



No* 3 Unio alatus, Say. 



megaptera, Rafinesque. 



No. 4. Unio anodontoides, Lea. 

 teres? Raf. 



No. 5. Unio Catillus, Conrad. 

 coccineus ? Hild. 

 Gouldianus, (white nacre,) Ward. 



No. 6. Unio cicatricosus, Say. 

 varicosus, Lea. 



