FlGS. I AND 2. 



Photographs of a front view of the two skulls shewn in profile in the 

 frontispiece, taken so as to shew the breadth of the ' forehead ' or pre- 

 frontal area, which is seen to be very much greater in the Greek skull 

 (Fig. 2) than in the Javanese Pithecanthropus (Fig. i). The prefrontal 

 area is marked out by a black dotted line, the outline of a plane (the pre- 

 frontal plane) which is at right angles to the sagittal plane and passes 

 through the meeting point of the frontal with the two parietal bones 

 above ; whilst below it passes through the median point called 'ophryon.' 

 The plane of the picture is parallel with this prefrontal plane. The white 

 dotted line gives the breadth of the boss-like prefrontal area. It is 

 identical in position with the line d in the side view of the same skulls 

 given in the frontispiece. The black dotted line is identical in position 

 with the line A C in those figures. The two specimens are equally reduced 

 in the photograph. (Original). 



