FOSS/L CARNIVORA 



23 



skull) had larger brain capacity, and the modem forms still larger 

 and better-developed brains. This indicates that slow but steady 



FI3. 16. SKULL OF THE PRIMITIVE MUSTELINE BUN/ELURUS 

 Oligocene of Colorado. Three-halves natural size. Viewed from the under side to show the teeth 



increase in intelligence which has occurred in almost all the lines 

 of evolution among quadrupeds. Superiority of brain is the 

 final test by which, in the long run, tJie persistence of a race is decided. 



FIG. 17. SKULL OF MUSTELA OGYGIA 

 An extinct species of marten, from the Middle Miocene of Colorado. Side view, natural size 



Felid^, or Cats. 



(Sabre-Tooth Tigers) 



Types: the mounted skeletons of Smilodon and Hoplophoneiis, 

 skeleton of Dinictis in block, skulls of Hoplophoneiis, Diniciis, Archcr- 

 lurits. 



