ILLUSTRATIONS xiii 



PLEISTOCENE PERIOD 



fAC 



PITHBCANTHROPUS . ... Alice B. Woodward 187 



ELASMOTHERIUM . . . ,, ,, . 189 



MAMMOTH . . ... ,, . 191 



HOMO MOUSTERIENSIS . . . ,, n I 9^ 



HIPPIDIUM . . . . . ,, ,, 203 



DADICURUS . . ...,,,,. 204 



MACRAUCHBNIA . . . , , 206 



DlPKOTODON . . ...,,,,. 208 



TEXT-FIGURES 

 Monobia (p. 9), Morula (p. 10), Blastosphere (p. 10), Gastrula (p. n). 



