THE ORIGIN OF SPECIES 



363 



EVOLUTION OF THE CAMELS 



fe 

 fe 



Recent 



3 leistocene 



Auchenio 

 (Llama) 



Skutl 



Feet 



1 



Pliocene 



Procamelus 



Miocene 



< 



fc 



^ 

 d 



Poebrotherium 



Ohgocene 



Protylopus 



Eocene 



1 



Mesozoic or Age of Reptiles 



Hypothetical five-toed Ancestor 



FIG. 190. Graphic presentation of the evolution of the Camel. 

 (From Lull, after Scott.) 



