THE FAMILY NAIADES. 



33 



o 

 I— I 



cr; 



o 



SUBROTUND. 



circiilus. //ca. ^«^. 

 Mya rotunda ? Wood. 



lens.* Lea. 



rubellus. Con. 



Masoni. Con. 



rotundatus. LuTn. 



Unio suborbiculata. Lam. Blain. 

 Unio glebulus.t Say. 

 Unio suglobosus. Lea. 



Paranensis. Lea. 



variabilis. Lea. 



Mya variabilis.! Mat. Wood. Dill 

 Unio rotundus. Wag. 



personatus. Say. 



Unio capillaris. Lea. 



* I have some doubts whether this should be considered more than a variety 

 of circulus. I am not, however, sure that it is not distinct. 



f Ahhough Mr. Say had pubhshed this shell in the Transylvania Journal, 

 and in his Am. Conchology, he omitted it altogether in his " Synonymy." 

 Other species are inserted from the vicinity of New Orleans. 



t The figures of this shell in the Lin. Soc. Trans., Vol. X., although so 

 much smaller a shell than Paranensis, (nobis,) is so much like it that I should 

 not be surprised if they should prove to be the same. 



F 



