146 



EVOLUTION, GENETICS, AND EUGENICS 



IT 



M 



c 



m 



JV^ 



B 



jr M 



Tig. 33. — Four stages in the evolution of the cameline fore foot. A , Protylopus, 

 Upper Eocene; B, Poebrotherium, Lower Oligocene; C, Frocamelus, Upper Miocene; 

 0. guanaco, Recent. (From Scott.) 



