EVIDENCES FROM PALAEONTOLOGY 



75 



D 



IF JT 



IF M 



FIG. 4. Four stages in the evolution of the cameline fore foot. A , Protylopus, 

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

 D. guanaco, Recent. (From Scott.) 



