PI.ATE 42. 



Fig. C6— Noturus gyrinus (Mitch.) Raf. 

 Hudson R. Nat. size. 



Fig. 67- -Noturua gyrinus {Mitch.) Raf. 

 Hudson K. 



Dentition of lower jaw. 



Dentition of upper jaw. 



Fig. G8 — Noturua sialis Jordan. 

 "WTiite E., Ind. Nat. size. 



Pectoral spine. 



