52 



UNIO. 



te 



c 



g 



OBLOXG. 



*cicur. Lea. 



*cistellaeformis. Lea. 

 *0rontesensis. Lea. 

 *Livingstonensis. Lea. 

 *Hallenbeckii. Lea. 

 *errans. Lea. 

 *Damascensis. Lea. 

 *vicinus. Lea. 

 *virens. Lea. 

 *opacus. Lea. 

 *Catawbensis. Lea. 

 *viridicatus. Lea. 

 *fumatus. Lea. 

 *rostrum. Lea. 

 *hepaticus. Lea. 

 *subniger. Lea. 

 *aequatus. Lea. 

 *subflavus. Lea. 

 *similis. Lea. 

 *nigellus. Lea. 

 *denigratus. Lea. 



( OBLONG. 



*Eadensis. Lea. 



*salebrosus. Lea. 

 *Uhare'ensis. Lea. 

 *viridans. Lea. 

 *subinflatus. Con. 

 *Abbevillensis. Lea. 

 *Kaleigb.ensis. Lea. 

 *Beaverensis. Lea. 

 *aberrans. * Lea. 

 *0rphaensis. Lea. 



cultelliformis. 1 Con. 

 Unio depressus. Con. Not Lain. 



*symmetricus. Lea. 



limatulus. Con. 

 *Buddianus. Lea. 



Stuarti. Ad. & An. 

 *lutulentus. Gould. 

 *Griffithianus. Lea. Han. 

 *mediocris. Lea. 

 *Valentinus. Rossm. Bourg. 



Zelebori. Fraun. 



1 Unio cultelliformis is described as coming from Australia. It is so much like one of our varieties 

 of complanatus, that I am induced to believe that some error of locality must have occurred. In a sub- 

 sequent paper (.11. A. X. S., v. 2, p. 295), Mr. Conrad makes cultelliformis a synonym to U. depressus, 

 Lam., which he also describes and figures, pi. 26, f. 2 ; but I think that cultelliformis should rather be 

 considered a synonym to complanatus, if it be not a true species, of which I have expressed a doubt 

 above. 



