UMIO. 



61 



WIDE. 



Unio opalimis. Anth. 



*fatuus. Lea. Chenu. 



*tenuissimus. Lea. Han. 



Syrnp. tenuissima. Lea. Sh. & Eat. 

 An. purpurascens. Swain. 

 Unio velum. Say. 

 Unio leptodon. Con. 



*bilineatus. Lea. Ben. Blan} Han. 

 Synip. bilineata. Lea, in Trans. Am. 

 P. S. 



*Corrianus. Lea. Blan} Han. 



*Mercerii. Lea. 



*orien talis. Lea. Chenu. 

 Unio productus. Mouss.* 

 Unio Sumatrensis. Fide Martens. 



*phaseolus. Hild. Sh. & Eat. Han. 

 Unio planidalus. Lea. Desh. Chenu. 

 Unio cuneatus? Barn. (White var.) 



*rufus. Lea. 



arcus. Con. Han. 



*gibbosus. Bar. Sh. <£ Eat. Hild. 

 Han. 

 Unio mucronatus. Bar. 

 Unio nasuta. Lam. Cuv. 

 Unio dilatata? Raf. 

 Unio dilatatus. Con. K'ust. 

 My a yihlosa. Eat. 

 Mya mucronata. Eat. 



'WIDE. 



*subgibbosus. Lea. 



^contractus. Lea. 



*arctior. Lea. Chenu. Han. 



*Tabascoensis. Phili. 



*Patagonicus. D'Orb. Han. 



*Yaugbanianus. Lea. Chenu. Han. 

 Unio Carolinensis. Prof. RaveneVs 

 Letter. 



OBOVATE. 



*purpuratus. Lam. Potier. Han. 

 Mya ventricosa* Solan. Humphreys? 

 Unio ater. Lea. Desh. Chenu. 

 Unio lugubris. Say. 

 Unio Poulsoni. Con. 

 Xaidd atra. Swain. 



*permiscens. Lea. 



*dolosus. Lea. 



*biangulatus. Lea. Chenu. 



rhombeus. Wag. Han. 

 Jjiplodon rhombeum. Spn'x. 



*cuprinus. Lea. Chenu. Han. 

 Unio metallicus? Say. 

 Unio sereus. Reeve. 



*Beskeanus. Dilnh. 



*Brownii. Lea. 



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

 marginalis, Lain., and may possibly be correct. 



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

 the same as orientalis (nobis). 



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

 man's Journal. 



* Fide Ferussac. 



5 Mr. Say, in his Synonymy, claims precedence. My Memoir bears the date of May 7, 1S30; his 

 that of January 1, 1831. 

 16 



