BIOLOGY OF MAN 



1151 



quarter of a million years ago, perhaps more. Along with the jaw 

 were found big "eoliths", — flints with little or dubious trace of 

 having been worked; and if Heidelberg man used them habitually, 

 he must have been a strong fellow. Some have called him Palcean- 

 thropus heidelbergensis ; others have placed him in the same genus 

 as Pithecanthropus; and others have ranked him as Homo. The 



CHIMPANZEE 

 .GIBBON SIAMANO \ AUSTRALIAN EUROPEAN 



ORANOW®"*'^'-'^ ATRICAnV ''V3N0OL 



NEW 



WORLD 



AVON KEYS 



PITHECANmROPUS/yr PI ltoown 



HOMINOIO OR HUMAN BRAf4CH 



PIVERCENCE ofANTHROPOIPS 

 AND HOMINOIDS 



COMMON STOCK 

 OF ANTHROPOIDS 

 AND HOMINOIDS 



TREE-SHREWS 



Fig. 194. 

 Diagram of Ancestry of Monkeys, Apes, and Man. After Keith. 



outstanding fact is that the lower jaw is strikingly intermediate 

 between the ape and the man. As Boule says, it is "a palaeonto- 

 logical relic representing, in an almost ideal way, a form interme- 

 diate between the structure of an ape and of a human being". The 

 jaw is an ape's, the teeth those of a man. Keith regards the Heidel- 

 berg man as on the way to the Neanderthal type of Homo. 



(3) The third important relic is the skull of Piltdown Man 

 {Eoanthropiis dawsoni), discovered by Dawson in 1911-12 in a gravel 



