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£7mo Gargottse. Phili. More. Gerst. 

 Jiossm. 



*Moreleti. 1 Desk. 



*sagittseformis. Lea. 



*rostriformis. Lea. 



*gracilentus. Lea. 



*nasutus. 2 Say. Barn. Swain. Han. 

 Gould. Linsl. Dekay. 

 Unio rostratus. Yalen. 

 My a nasuta. Wood. Eat. 

 Eurynea nasuta. Stimpson. (Agass. 

 MSS.) 



*Mississippiensis. Con. 

 Unio Cocoduensis. Reeve. 



*aquilus. Lea. 



*protensus. Lea. 



*extensus. Lea. 



*Burkensis. Lea. 



*oblatus. Lea. 



*Maconensis. Lea. 



WIDE. 



*naviculoides. Lea. 



*perlatus. Lea. 



*Hazlehurstianus. Lea. 



*Barrattii. Lea. 



productus. 3 Con. Kilst. Han. 



*viridiradiatus. Lea. 



*pullatus. Lea. 



*Fisherianus. Lea. Chenu. Hun. 



*nasutulus. Lea. 



*Emnionsii. Lea. 



*aheneus. Lea. 



*Jayanus. Lea. Chenu. Han. 



*marginalis. Lam. Desh. Blan. Han. 

 Unio anodontina. Lam. Blan. 

 Unio evanescens? Mouss. 



*iris. 4 Lea. Desh. Chenu. Han. 

 Unio suhrostratus. Say. 

 Unio nebulosus? Con. 



*Novi-Eboraci. 5 Lea. Dekay. Chenu. 



1 This is no doubt a good species. I have seen a very good specimen belonging to the cabinet of the 

 Rev. Mr. Beadle, of Hartford, Conn. ^ 



2 Mr. Agassiz says that the genus Unio, Retz., is represented in this country by U. nasutus, Lam. 

 Lamarck's nasutus is gibbosus, Bar. Mr. Say preoccupied the name nasutus in 181(i. Lamarck published 

 in 1819. In the synonymy of gibbosus, I have in all my editions of this work placed Lamarck's nasutus 

 as a synonym to gibbosus, Bar. 



3 This is probably the same as folliculatus, Lea, which latter name has precedence. 



4 Mr. Say, in his Synonymy, gives iris as a synonj-m to his suhrostratus. If they were the same, I 

 would be entitled to precedence, as my description bears date March, 1820, while his is January, 1831. 

 His description, however, of suhrostratus 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 suhrostratus "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 suhrostratus. 



6 Novi-Eboraci and iris are in the outlines nearly identical, but in the soft parts there are differences 

 which I have pointed out in the Journal of the Academy Nat. Sciences, vol. v., X. S., and Observations 

 on Unio, vol. x. 



