Fig. 48. Evolution of the Hu- 

 man Skull: Ten Structural 

 Stages. 



I. Lobe-finned fish, Devonian 

 age (after Traquair, Watson, Bry- 

 ant). II. Primitive amphibian. 

 Lower Carboniferous (after Wat- 

 son). III. Primitive cotylosau- 

 rian reptile, Permo-Carboniferous 

 (after Broili, Williston, Watson). 

 IV. Primitive theromorph reptile, 

 Permo-Carboniferous (after Willis- 

 ton). V. Gorgonopsian reptile, 

 Permian (after Broom). VI. 

 Primitive cynodont reptile, Trias- 

 sic (after Broom, Haughton). VII. 

 Primitive marsupial. Upper Cre- 

 taceous (after Matthew) VIII. 

 Primitive primate. Eocene (after Gregory), 

 chimpanzee). Recent. X. Man, Recent. 



For details, see pp. xxii, xxiii 

 78 



Anthropoid (fei 



