PLATE 38. 
Fic. 58—Noturus exilis Nelson. 
Root R., Wis. Nat size. 
- 
Fra. 59—Noturus exilis Nelson. 
Root R., Wis. Nat. size. 
Fa. 59 (6)—Noturns exilis Nelson. 
Illinois R. From one of three original ty pes. 
