28 ILLINOIS BIOLOGICAL MONOGRAPHS [208 



EXPLANATION OF PLATE 



Fig. 7. Posterior view of skull of Scorpionichthys marmoratus. Three-fourths 



natural' size. 

 Fig. 8. Posterior view of skull of Ophidon elongatus. Three-fourths natural size. 

 Fig. 9. Premaxillary of Ophidon elongatus. Three-fourths natural size. 

 Fig. 10. Premaxillary of Scorpionichthys marmoratus. Three-fourths natural size. 



