PARALLEL EVOLUTION IN OTHER RACES 



IT is intcMcslinsj; lo ()1)mm\(' iIkiI while the cxolul ion of the lioisc was 

 l)^()«i;^(»s^i^^I; duiini:,- the TcrliiMy jx'iiod in Noitli AiiiciicM anollicr 

 L'Touj) of lioofcd I'jiiiiKils, \\\v Litoptcrna. now cxlinct. in Soiitli 

 AnuMica exoK'iMl a race a(lai)t(Ml to the hioad i)lains of Ar<i('nlina and 



FIG. 22. THREE-TOED PSEUDO-HORSE 



Fore and hind feet, one-half nataral size. Diadiaphoru.s of the Miocene of South 

 America, although so closely like the three-toed horses in the feet, has a wholly 

 different skull and teeth, and belongs to a different order, the Litopterna, peculiar t:) 

 South America and now extinct. From specimens in the American Mu.seum 



33 



