20 Field Museum of Natural History — Geology, Vol. IV. 



Dolickorhinus tongiceps 



Triplopus 

 Dolickorhinus tongiceps 



Dolickorhinus tongiceps 

 Metarkinus earlei 



Mesonyx 

 Triplopitf 



Rkadinorhinus abkotti 

 Type locality 



Dolickorhinus longicep* 

 Metarkinus cristatus 



Type locality 

 Metarkinus riparius 

 Eobasileus 

 Dolichorhinns tongtcepfi 



Metarkinus riparinA 



Fig. I. Section of Metarhinus Beds, as exposed in the north wall of White River. 

 See pages 19 and 22. 



