MAN'S PLACE IN NATURE 



455 



FIG. 283. Baby orang-utan. 

 (From life.) 



for their very long arms and 



erect posture; Siamanga syndac- 



tyla, the siamang; Simia satyrus, 



the orang-utan ; Pan gorilla, 



the gorilla, sometimes called 



Troglodytes gorilla (though the 



name Troglodytes was first used 



for the wren) ; and the chim- 

 panzees, Anthropithecus niger and 



calvus. Of these the gorilla is 



physically the strongest. It 



reaches a height of five feet 



and a weight of 200 pounds. 



The chimpanzee, smaller and 



more amiable in disposition, 



most suggests man in appear- 

 ance, although the gorilla is 



structurally most like him. 



The order of primates has been variously classified. It is 



conveniently divided into five principal groups: (a) the lemurs 



(including Lemuridse, Cheiromyidae, Galeopithecidse, and still 



more generalized ex- 

 tinct forms) ; (6) the 

 Platyrrhine or New- 

 World monkeys 

 (Cebidse and Arcto- 

 pithecidse or Mar- 

 mosets; (c) the 

 Catarrhine or Old- 

 World monkeys and 

 baboons (Cercopi- 

 thecidse); (d) the 

 anthropoid apes 

 (Simiidae) ; and (e) 

 man (Hominidae). 



The lemurs of 

 Madagascar are the 

 most primitive. 

 Like other primates, 

 they have flat nails 



FIG. 284. Lemur, furcifer. (After Ritzema Bos.) and an 



