THE ORIGIN OF SPECIES 



363 



EVOLUTION OF THE CAMELS 



g 



2 

 "fc 



Recent 



Pleistocene 



Auchenio 

 (Llama) 



Skull 



Feet 



Teeth 



Pliocene 



Procamelus 



Miocene 



I 



Poebrotherium 



Ohgocene 



Protylopus 



Eocene 



Mesozoic or Age of Reptiles 



Hypothetical five-toed Ancestor 



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

 (From Lull, after Scott.) 



