CHAPTEE IX 



THE TEETH OF THE HIGHEE APES 

 AND MAN 



The higher Apes (the Anthropomorpha) in- 

 clude the Gibbon, the Orang, Chimpanzee, and 

 Gorilla. They differ markedly from the lower 

 Primates in many respects, i.e., in having no tails 

 and no callosities ; in habitually assuming a semi- 

 erect attitude ; the broader thorax ; the elongation 

 of the forearm so as to support the body on the 

 fingers or knuckles, etc. They are largely arbo- 

 real in their habits. 



The jaws are of a more or less parallelogram 

 shape, the rounder arch of man being but little 

 approached in the Apes. The skull is small and 

 depressed, and the jaws large and prominent, so 

 that the prognathism is very marked. 



The teeth are similar in number and form to 

 those of man, and approach his in all the essential 

 features of their structure, although there are 

 some differences as to arrangement, texture, 

 squareness of form, etc. The central incisors are 

 wider than the laterals, as in man; the lower 



182 



