﻿PROCEEDINGS OE THE GEOLOGICAL SOCIETY. [May I9IO, 



mean, and minimum capacity of the gorilla are based on measure- 

 ments of thirteen adult male skulls. 1 



The femur, though it presents some characters which are also met 

 with in the gibbon, is on the whole more human than simian, and 

 belonged to an animal which walked erect. 

















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The age of Pithecanthropus cannot be regarded as precisely 

 determined ; Dr. Dubois regards it as Pliocene, but the weight of 

 opinion inclines to the Pleistocene. 2 The Kendeng Beds in which it 

 was found are folded along with the underlying Tertiary, and are 

 thus older than the existing river-terraces, which yet contain Elephas 

 and Hippopotamus. J. Elbert, 3 the latest writer on the question, 

 proposes the following classification of the Kendeng Beds : — 



Upper Kendeng Beds (Nos. 1- 4) = Upper Pleistocene. 

 Middle Kendeng Beds (Nos. 5-10) = Middle Pleistocene. 

 Lower Kendeng Beds (Nos. 15-21) = Lower Pleistocene. 

 Transition (Nos. 22-23) 



Upper Pliocene. 



1 The mean may be too low. Keith obtained 530 cubic centimetres as the 

 mean of nine skulls. 



2 W. Volz, 'Das geologische Alter der Pithecanthrojms-Schichten bei 

 Trinil, Ost-Java' Neues Jahrb. Festband (1907) p. 256; W. Branca, 

 4 Vorlaufiger Bericht, &c.' S.-B. d.k. Preuss. Akad. d. Wissensch. Berlin, 1908, 

 p. 261. 



3 ' Dubois' Alterbestimmung der Kendengschichten, ein Wort der Entgegn- 

 •ung ' Centralblatt fur Min. Geol. & Pal. 1909, No. 17, p. 513. 



