THE FAMILY NAIADES, 



35 



C/3 



o 



o 





Unio Sageri ?* Con. 

 Mya prselonga. Wood. 



(lehiscens.t Sai/. 

 Unio oriens. Lea. 



angustatus. Lea. 



lanceolatus.t I^ea. 



Anodontoides. Lea. 

 Unio teres ? Ba/. 

 Unio teres. Co7i. 



parallelopipedon. Lea. 



platyrhynchus.§ Rossmaeslcr. 



ovalis. Flem. 



Mytilus angustior.|| List. 



* Mr. Conrad's figure so nearly resembles the male specimens of U. rectus 

 from Green Bay, in my cabinet, that I am persuaded the Sagpri will not prove 

 to be a distinct species. 



j- Mr. Say gives Mr. Rafinesque's name of lata precedence. Mr. Eaton 

 says that An. lata, Raf., is Sym. temiissima, Lea. 



i M. Deshayes (2d edit. Lamarck) doubts if lanceolatus be not the young 

 of Jlnodontoides. The first has been found only in the waters east of the 

 Alleghany mountains, the last only in the western waters. There cannot be 

 a doubt of their being distinct species. In size they dilfer altogether. 



§ This is a curious and very interesting new species which I recently re- 

 ceived from Vienna. Its habitat is Carynthea. 



II On the authority of Fleming. 



