UNIO. 



61 



fWIDE. 



Unio opalinus. Antli. 



*fatuus. Lea. Ghenu. 



*tenuissimus. Lea. Han. 



Symp. tenuissima. Lea. Sh. & Eat. 

 An. purpurascens. Swain. 

 Unto velum. Say. 

 Unio leptodo7i. Con. 



*bilineatus. Lea. Ben. Blan.^ Han. 

 Symp). hilineata. Lea., in Trans. Am. 

 P. S. 



*Corrianus. Lea. Blan} Han. 



*Mercerii. Lea. 



*orientalis. Lea. Ohenu. 

 Unio productus. Mouss.^ 

 Unio Sumatrensis. Fide Martens. 



^pliaseolus. Hild. Sh. & Eat. Han. 

 Unio planulatus. Jjea. Desh. Ghenu. 

 Unio cuneatus.^ Barn. (White var.) 



*rufus. Lea. 



areas. Co7i. Han. 



*gil)bosus. Bar. Sh. & Eat. Hild. 

 Han. 

 Unio mucronatus. Bar. 

 Unio nasuta. Lam. Guv. 

 Unio dilatata? Baf. 

 Unio dilatatus. Gon. Kiist. 

 Mya gilhosa. Eat. 

 Mya mucronata. Eat. 



fWIDE. 



*subgibbosus. Lea. 



^contractus. Lea. 



*arctior. Lea. Ghenu. Han. 



*Tabascoensis. Phili. 



*Patagonicns. I) ' Orh. Han. 



*Va'uglianianns. Lea. Ghenu. Han. 

 Unio Garolinensis. Prof. RaveneVs 

 Letter. 



OBOVATE. 



*purpuratus. Lam. Potier. Han. 

 Mya ventricosa.* Solan. Humphreys? 

 Unio ater. Lea. Desh. Ghenu, 

 Unio lugubris. Say. 

 Unio Poulsoni. Gon. 

 Naida atra. Swain. 



*permiscens. Lea. 



^dolosus. Lea. 



*biangulatus. Lea. Ghenu. 



rliombens. Wag. Han. 

 Diplodon rhomheum. Spix. 



*ctiprinus. Lea. Ghenu. Han. 

 Unio metallicus.^ Say. 

 Unio sereus. Peeve. 



"Beskeanus. Diinh. 



■^Brownii. Lea. 



' Benson and Blanford both consider bilineatus and Corrianus to be different stages of growth of 

 marginalis, Lam., and may possibly be correct. 



' In the last edition I considered this as a distinct species, but have since been satisfied that it is 

 the same as orientalis (nobis). 



' In note to Dr. Hildreth's Memoir on the shells in the vicinity of Marietta, Ohio, published in Silli- 

 man^s Journal. 



* Fide Ferussac. 



' Mr. Say, in his Synonymy., claims precedence. My Memoir bears the date of May T, 1830; his 

 that of January 1, 1831. 

 16 



