PLATE 38. 



Pig. 58 — ISToturus oxilis Nelson. 

 Root E., "Wis. Xat size. 



FrG. 59— Noturus exilis Nelson. 

 Root R. , Wis. Nat. size. 



Fia. 59 (6)— Noturnu exilis Nelson. 

 Illinois R. From one of three original types. 



