Premaxillae of representative species of Noturus, showing their ethmoidal attachment and 

 some of the variations in tooth arrangement. [Drawings by Dorothea Schultz.] 



Figure 1. Noturus gyrinus (USNM 174905, Michigan). 



Figure 2. Noturus exilis (USNM 174904, Kansas). 



Figure 3. Noturus flavus (USNM 174908, Michigan). 



Figure 4. Noturus stigmosus (USNM 174906, Michigan). 



