50 



Var. marginata nacre bordered, 

 white. 



Species rarely found in the Ohio, but more 

 abundantly in the small rivers. Length from one 

 to two inches ; remarkable by its apices, which 

 are turned in front, and large wrinkles, which are 

 often divided in two by a. furrow ; cardinal tooth 

 wrinkled; fossule visible; lamellar tooth wrinkled, 

 somewhat oblique, almost double even in the 

 right valve. 



SPECIES XLVII. Obovaria striata (Unio 

 striata.) 



Shell thick, ventricose, rounded inferiorly; 

 with striated wrinkles; apices scarcely promi- 

 nent ; epidermis brown ; nacre white ; medial 

 breadth | diam. / T of the length axis f of 

 the breadth. 



Var. 1. tuber culata some striated tu- 

 bercles on the wrinkles. 

 Var. 2. rosea epidermis reddish brown, 



brown anteriorly, nacre roseate. 

 Length about three inches ; found in the 

 upper part of the Ohio. Animal yellow ; lamel- 

 lar tooth almost vertical, thick ; cardinal tooth 

 furrowed ; fossule visible. 



