PLATE 38. 



Fig. 58 — Notorus oxilis Nelson. 

 Eoot E., Wis. Kat size. 



Fro. 59— Noturus exilis Nelton. 

 Root R. , Wis. Nat. size. 



Fig. 59 (b) — Noturns exilis Nelson. 

 Illinois R. From one of three original types. 



