Fig. 1.—Pithecanthropus from Java Fig. 2.—Greek Skull
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 prefrontal area, which is seen to be very much greater in the Greek skull ([Fig. 2]) than in the Javanese Pithecanthropus ([Fig. 1]). The prefrontal area is marked out by a black dotted line, the outline of a plane (the prefrontal 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).
Fig. 3.