THE FAMILY NAIADES. 



19 



O 

 O 



Oh 



o 



^ J 



o < 



o 



TRIANGULAR. * 



penitus.* Con. 



securis. Lea. Eat. 



Unio depressa.t Raf. ; but not of Lam. 



camelus. Lea. 



ovatus. Say. Lam. Bar. Valen. Eat. 

 Hild. Con. 

 Unio ventricosus. Desh. 

 Unio subovatus. Desh. 

 Unio occidens. Desh. 



subovatus. ± I^ea. 



crassidens.§ Lam. 

 Unio cuneatus. Bar. 



Eat. Hild. 



Unio niger; 

 Unio niger. 



Raf. 

 Con. 



carbonarius. Lea. 



* I received from Judge Tait of Alabama, in 1830, several specimens of 

 this species, but they were not sufficiently perfect to induce me to publish 

 them. Mr. Conrad does not mention the rays, a very pecuUar character of 

 which is their being clotted somewhat like those of securis, fnobis,) but in 

 a lighter manner. 



■\ Mr. Conrad makes depressa, Kaf., ellipsaria, Raf., and securis, (nobis,) 

 synonymous with lineolata, Raf. Mr, Say does the same, with the excep- 

 tion of elUpsaria, which he considers distinct; while Mr. Rafinesque himself 

 places li7ieolata and elUpsaria in different subgenera ! ! 



t Mr. Say makes " ventricosus, Bar., occidens, (nobis,) subovatus, (nobis,) 

 (var.), and capax. Green, (var.)," synonymous with cardium, Raf. In my 

 opinion they form at least three, perhaps four distinct species. 



§ Crassidens, Var. a. Lam., is trapezoides, (nobis.) 



