OUR FACE FROM FISH TO MAN 



form of palate with narrow space between the 

 canines. In the lower jaw the diminution of the 

 lower canines and the backward retreat of the 

 incisors finally brings the canines almost to the 



Fig. 75. Lower Front Premolars of Fossil Anthropoids 

 (A, B, C) AND Man (D, E). 



(A, B, after Gregory and Hellman; C, after Pilgrim; D, after Virchow; 

 E, from Selenka, after Rose.) For details, see p. xxx. 



front of the jaw and into functional alignment with 

 the incisors. 



The upper premolars or bicuspids of man, which 

 in the adult dentition are two in number on each 

 side of both the upper and lower jaws, find their 

 nearest relatives in the bicuspid upper and lower 

 premolars of the anthropoid apes (Fig. 74). 



The front lower premolars of the anthropoids 



show a wide range of forms, from types with a more 



compressed baboon-like crown to the almost human 



premolars of the extinct Sivapithecus (Fig. 75 C) 



144 



