ILLUSTRATIONS 



A. Fossil lemuroid {Notharctus). Eocene epoch. 



B. African lemur {Arctocehus) . 



C. Tarsius spectrum, Borneo. 



D. Marmoset {Midas). 



E. Gibbon (Hylobates). 



F. Chimpanzee (Anthropopithecus). 



36. — Side View of Skulls of Primates, Showing 

 Progressive Shortening of the Muzzle, 

 Downward Bending of the Suborbital 

 Face and Forward Growth of the Chin 59 



A. Eocene lemuroid (Notharctus). 



B. Old World Monkey (Lasiopyga kolbi). (After 

 ElHot.) 



C. Female chimpanzee. (After Elliot.) 



D. Man. 



37. — Epitome of the Fossil History of Human 



AND Prehuman Primates. 1927 . . 61 



Showing the range in geologic time of the different 

 groups, their dental formulae, the side view of the 

 tooth-bearing part of the lower jaw, the lower dental 

 arch seen from above, and the back part of the lower 

 jaw. 



A. Tree-shrews, represented by jaw of Leipsano- 

 lestes siegfriedti. (After Simpson. Back part of jaw 

 from modern tree-shrew Ptilocercus). 



B. Primitive lemuroid, represented by jaw of 

 Pelycodus trigonodus. (After Matthew.) 



C. Proto-anthropoid, represented by jaw of Parapi- 

 thecus fraasi. (After stereoscopic photograph by J. H. 

 McGregor.) 



D. Proto-anthropoid, represented by jaw of Prop- 

 liopithecus hceckeli. (After stereoscopic photograph 

 by J. H. McGregor.) 



E. Man-like anthropoid, represented by jaw of 

 Sivapithecus himalayensis. (After Pilgrim.) 



F. Dawn-man, represented by jaw of Eoanihropus 

 dawsoni. (After A. S. Woodward.) 



xix 



