PLATE 42. 
WS 
Fic. 66—Noturus gyrinus (Mitch.) Raf. 
Hudson R. Nat. size. 
Fic. 67--Noturus gyrinus (Mitch.) Raf. 
Hudson R. 
Dentition of lower jaw. 
Dentition of upper jaw. 
Fic. 68—Noturus sialis Jordan. 
White R., Ind. Nat. size. 
Pectoral spine. 
