Yol. 69.] THE HUMAN SKULL, ETC. FROM PILTDOWN. 



I:!; 



brow-ridges. The species of which the skull and mandible have- 

 now been described in detail may be named Eoanthropus 

 dawsoni, in honour of its discoverer. 



The differences between the mandible of E. daivsoni and 

 other primitive human mandibles hitherto discovered are very 

 remarkable ; but they are especially striking when comparison is 

 made between the new specimen and the mandible of Homo 

 heidelbergensis (fig. 7, p. 138). 1 These two jaws can be very satis- 

 factorily compared : because the first and second molars are almost 

 identical in length in the two specimens, and their outline may be 



(Fig. 6 cont.) 



exactly superposed, as shown in fig. 7. While separated by the 

 characters of the inner face and symphysis already noted (p. 131), 

 the mandible of Eoanthropus dawsoni is thus seen to differ also in 

 its comparative slenderness and its regular deepening to the sym- 

 physial end ; and, whereas the anterior teeth of the new specimen 

 must have occupied a space of about 60 mm., those of Homo 

 heidelbergensis have only the usual extreme human extent of 

 40 mm. When it is remembered that Eoanthropus daivsoni and 

 H. heidelbergensis are almost (if not absolutely) of the same geo- 

 logical age, we are thus led to the interesting conclusion that at 



1 O. Schoetensack, ' Der Unterkiefer des Homo licidclbergcnsis' Leipzig, 

 1908. 



