ILLUSTRATIONS 



FIGURE PACK 



IX. Pleistocene. Primitive man, Mousterian. 

 (From stereoscopic photographs by J. H. McGregor 

 and from the pubHshed photographs by Weinert and 

 by Virchow (ms). Occlusion diagram by author. 



X. Recent. Modern man, white. (From the original 

 specimen. Occlusion diagram by author.) 



79. — The Dryopithecus Pattern in the Lower 

 Molar Teeth of Recent and Fossil 

 Anthropoids ...... 150 



(After Gregory and Hellman.) 



A. Fossil anthropoid {Dryopithecus fontani) . The 

 first lower molar shows the fovea anterior, the five 

 main cusps and the fovea posterior. 



B. Fossil anthropoid {Dryopithecus cautleyi). The 

 third lower molar (at the left) shows a perfect Dryopi- 

 thecus pattern. 



C. Fossil anthropoid {Dryopithecus frickas) . (Com- 

 pare Fig. 80 C.) 



D. Recent orang-utan. The Dryopithecus pattern 

 is somewhat obscured by the secondary wrinkles of 

 the enamel. 



E. Recent chimpanzee. The Dryopithecus pattern 

 in this particular specimen is slightly obscured by the 

 secondary wrinkles of the enamel. Cusp 6, a bud from 

 the hinder rim of the tooth is present in the second 

 lower molar. (Compare Fig. SOD.) 



F. Recent gorilla. The teeth are elongated in a 

 fore-and-aft direction and the cusps are high and 

 nipple-like. 



80. — Progressive Reduction and Loss of the 

 Dryopithecus Pattern in the Lower Molars 

 of Fossil and Recent Men. . . . 151 



(After Gregory and Hellman.) 



A. Fossil Heidelberg man. Worn lower molar 

 crowns, showing clear traces of the Dryopithecus 

 pattern. 



xxxii 



