ILLUSTRATIONS 



MoUXTliD SkF.LKTOX OF TiTAXOTHEKE, FROM THE BiG BaD 



Lands of South Dakota ..... 



Mounted Skeleton of Phenacodus in North Alcove 2 

 Skull and Tusks of the Imperial Mammoth 



INVOLUTION OF THE Ho«SE — FeET ..... 



Scene in the Bad-Lands op the Uinta Basin — Tertiary 

 Fossil Field of Northeastern Utah . 



Skeleton of Brostosaukus ...... 



Taking up Fossil Dinosaur Bones at " Bone Cabin " Quarry 

 Wyoming ......... 



Divisions of the Age of Reptiles .... 



17 

 19 

 21 



23 



25 

 27 



2.S 

 30 



