SIMIIDAE 737 
the arms reach only a short distance below the knee, in which 
respect the Chimpanzee is more human-like than any of the other 
Apes. The face is furnished with distinct whiskers, eyebrows, and 
eyelashes. The pollex reaches nearly or quite to the base of the 
first phalange of the index finger, and the hallux to the base of 
the second phalange of the corresponding digit of the foot. The 
laryngeal sacs are as largely developed as in the Gorilla. 
Although the skull of the Chimpanzee has distinct superciliary 
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By, 
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Fia. 357.—The Chimpanzee (Anthropopithecus troglodytes). From Mr. Wolf's drawing of a young 
individual in the Zoological Society’s Gardens. 
‘ridges, yet the high bony crests of the calvarium of the male 
Gorilla are wanting, and the whole coronal region of the skull is 
more rounded and far less rugged. 
The canine teeth of the male Chimpanzee are relatively much 
smaller than in the Gorilla and Orang. The upper molars are 
characterised by the third one being smaller than either of the 
other two, as well as by the presence of an indistinct cingulum on 
their inner surfaces. The upper premolars differ from those of the 
other genera of the family by the shortness of their antero-posterior 
47 
