22 INTRODUCTION TO PART I 



marmosets and the Cebidae). The second group, or iiiterrnediate primates, 

 includes all of the old-world Catarrhine monkeys with the exception of the 

 three great anthropoid apes. The third group, called the higher anthropoids, 

 includes the orang, the chimpanzee and the gorilla; while the sole occupant 

 of the fourth group is Homo sapiens, although reference is made to certain 

 features in the development of the several races of prehistoric man. 



