MAMMALIA. PRIMATES. 373 



The second digit of the pes has a flattened nail except in the 

 Hapalidae, in which all the digits of the pes except the hallux 

 are clawed. 



The Anthropoidea are divided into five families : 



1. Hapalidae or Marmosets. 



2. Cebidae or American Monkeys. 



3. Cercopithecidae or Old World Monkeys. 



4. Simiidae or Anthropoid Apes. 



5. Hominidae or Men. 



