THE FAMILY NAIADES. 



133 



01 



w 

 o 



« 



>< 

 W 



o 



z; 



n 



O ■{ 



WIDE. 



*iris.f Lea. 



Unio nebulosus. Con. 



*tenuissimu9. Lea. 

 Symp. tenuissima. 



Am. P. S. 

 An. puipurascens. 

 Unio velum. Say. 



Lea, in Trans. 



Swain. 



*bilineatus. Lea. Ben. 



Symp. bilineata. Lea, in Trans. Am. 

 P. S. 



*Corrianns. Lea. 



*phaseolus. Hild. Eat. 

 Unio planulalus. Lea. 

 Unio cuneatus.:}: Barn. (White 

 var.) 



arcus. 



Con. 



arctatus. Con. 



*gibbosus. Bar. Eat. Hild. 

 Unio mucronatus. Bar. 

 Unio nasuta. Lam. 

 Unio dilatata? Raf. 

 Unio dilatatus. Con. 



*arctior. Lea. 



*Patagonicus. D'Orh. 



m 

 W 



o 



H 



W 

 Is- 



z; 

 o 



WIDE. 



*Vaughanianus. Lea, 

 Unio Carolinensis. 

 Letter. 



Prof. RaveneVs 



OBOVATE. 



*purpuratus. Lam. 



Mya ventricosa.§ Solan. Hum- 

 phreys ? 

 Unio ater. Lea. 

 Unio lugubris. /Say. 

 Unio Poulsoni. Con. 



ihorabeus. Wag. 



Diplodon rhombeum. Spix. 



*cuprinus. Lea. 



Unio metaliicus. || Say. 



*modioliformis. Lea. 

 Unio delumbis. Con. 



*tenerus. Rav. 



Unio tenebrosus. Con. 



*Tappanianus. Lea. 



*contradens. Lea. 



stramineus. Con. 



t Mr Say in his " Synonymy" gives iris as a synonym to his subrostratus. If they were the same I would 

 be entitled to precedence, as my description bears date March 1829, while his is January 1831. His descrip- 

 tion, however, of subrostratus does not apply to my iris, and certainly this shell could not have been under his 

 eye when his description was made. He says that the subrostratus " may be said to be the analogue of the 

 Unio nasutus (nobis) of the western waters." As the U. nasutus inhabits the western waters, a variety of that 

 species may have been described by him for subrostratus. 



X In note to Dr Hildreth's Memoir on the shells in the vicinity of Marietta, Ohio, published in Silliman's 

 Journal. 



§ '^n the authority of Ferussac. 



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

 January 1, 1831. 



yi.— 2 I 



