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). 



