30 



SYNOPSIS OF 



o 



w 



o 



foBLONG. 



tetralasmus. 



.SV/3/. 





camptodon.* Say. 

 Unio declivis.t Co;i. 



obesus.J Lea. 

 Hopetonensis. Lea. 

 Roanokensis. Lea. 



jeji 



Lea. 



coinplanatus. Lea. 



Mya complanata. Soland. Dill. 



Unio vU)laceus.§ Spangler. 

 Unio purpureas. II fey. Bar. 



• This fine shell, as well as the preceding one, both of which are Mr. 

 Say's, seem to have been overlooked in the formation of his catalogue. They 

 are described in his Amer. Coiichology. I have never seen the shell he calls 

 tetralasmus, — they may possibly prove to be the same. 



j- The shell in the Academy of Nat. Sci., described and figured by Mr. 

 Conrad in his " Monography," page 45, as decllvis, Say, I consider to be a 

 middle aged camptodon. Say. This, however, is not the opinion of all our 

 conchologists. 



i Ferussac believes that this is Carolinianns of Bosc. Not having seen 

 the specimen described by Bosc, nor having access to his description, I am 

 unable to decide. The fact, however, of Bosc's having visited Carolina some 

 forty years since, renders it highly probable to be so. Ferussac gives his tra- 

 pezium as a synonym to Caroliniamis. In my table of the Uniones made in 

 1829, 1 considered CaroU7uanus as the complanatus : in which I was most 

 likely wrong. 



§ On the authority of Ferussac. 



II Mr. Conrad is wrong in his " Synoptical Table," in giving Mr. Say's 

 name precedence, making compkmatus a synonym. 



