Unio. 45 



Dysuomia ^g^. 



554 1 gibbosus Raf. Am. bor. 



U. perplexus Lea 6. 

 {]. obliquus Lam. (Pot. & Mich.) 

 Rotundaria Raf. 



555 1 cælatus Conrad. — 



556 1 sp. — 



Crenodonta Scliliitei* (Bariosta Raf ? Com- 

 planaria sect. 3 Ag.) 



557 1 plicatus Say. (jun.) — 



Proptera undulosa Raf. teste Val. 

 U. peruviana Lam. 

 Complaiiaria S\¥S. (Alasmodonta Aiitt.) 



558 1 complanatus Barnes. (Say?) — 



Compl. gigas Sws. 

 Metaptera Raf (PropteraRaf.LymnadiaSws.) 



559 1 megapterus Raf. — 



Symphynota alata Say. Lea, 

 (minor.) — 



latissimus Raf Am. bor. 



U. Poulsoni Conrad. 

 liaiiipsilis Raf. (Aeglia Sws.) 

 ovatus Say. â — 



ocliraceus Say. — 



cariosus Say. , — 



U. ovata Val. , 



U. ventricosus Barnes, ofr. 



virginianus Lam. 

 Mya anatina Meush. Mus. 



Gronov. p. 93. 

 Mya radiata ^ Gm. (List. 132. 7.) 

 U. radiata Lam. 



