UNIO. 



01 



no 



a 





 K 



H 



? 



c 



WIDE. 



C/mo opalinus. Anth. 



*fatuus. .tea. Chenu. 



*tenuissimus. Lea. Han. 



Symp. tenuissima. Lea. Sh. & Eat. 

 An. purpurascens. Swain. 

 Unio velum. Say. 

 Unio leptodon. Con. 



*bilineatus. Lea. Ben. Blan. 1 Han. 

 Symp. bilineata. Lea, in Trans. Am. 

 P. S. 



*Corrianus. Lea. Blan. 1 Han. 

 *Mercerii. Lea. 



*orientalis. Lea. Chenu. 

 Unio productus. Jfouss.* 

 Unio Sumatrensis. Fide Martens. 



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

 Unio planulatus. Lea. Desh. Chenu. 

 Unio cuneatm? 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. Kust. 

 Mya gibbosa. Eat. 

 Mya mucronata. Eat. 



( \VIDE. 



*subgibbosus. Lea. 

 *contractus. Lea. 

 *arctior. Lea. Chenu. Han. 

 *Tabascoensis. Phili. 

 *Patagonicu3. D'Orb. Han. 



*Vaughanianus. Lea. Chenu. Han. 

 Unio Carolinensis. Prof. RaveneVs 

 Letter. 



OBOVATE. 



*purpuratus. Lam. Potier. Han. 

 Mya ventricosa* Solan. Humphreys? 

 Unio ater. Lea. Desk. Chenu. 

 Unio lugubris. Say. 

 Unio Poulsoni. Con. 

 Naidd atra. Swain. 



*permiscens. Lea. 

 *dolosus. Lea. 

 *biangulatus. Lea. Chenu. 



rhombeus. Wag. Han. 

 Diplodon rhonibeum. Spix. 



*cuprinus. Lea. Chenu. Han. 

 Unio metallicus? Say. 

 Unio sereus. Reeve. 



*Beskeanus. Dunk. 

 *Brownii. Lea. 



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

 marginalis^ Lam., 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). 



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

 man's Journal. v 



4 Fide Ferussac. 



5 Mr. Say, in his Synonymy, claims precedence. My Memoir bears the date of May 7, 1830; his 

 that of January 1, 1831. 



16 



