109 

 UNIO SAXEUS, 



Plate LX. — Fig. 1. 



DESCRIPTION. 



Shell obovate, ventricose, rather thin; beaks de- 

 corticated, slightly prominent, summits obtuse; um- 

 bonial slope subangulated or obtusely rounded; 

 ligament margin elevated, not oblique; posterior 

 margin obliquely rectilinear or slightly concave; 

 extremity truncated, direct; basal margin regularly 

 arcuated; epidermis yellowish-brown, rather ob- 

 scurely rayed; within bluish; cardinal teeth direct, 

 compressed; lateral teeth straight. 



OBSERVATIONS. 



I found a few individuals of this species in the 

 summer of 1833 on the shore of the Alabama river 

 at Claiborne, where there is an indurated calcareous 

 platform. They were all dead shells; and like its 

 associate, U. arctatus, this species I never saw on the 

 muddy shores or gravelly bars. 



UNIO COLLINUS. 



Plate LX.— Fig. 3. 



OBSERVATIONS. 



Since the publication of this species in a former 

 number of this work, I have received a few specimens 



