Page:Evidence as to Man's Place in Nature.djvu/181

gitudinally and vertically, through the middle. The sectional diagrams then have been superimposed, in such a manner, that the basal axes of the skulls coincide by their anterior ends and in their direction. The deviations of the rest of the contours (which represent the interior of Fig. 30.—Sections of orthognathous (light contour) and prognathous (dark contour) skulls, one-third of the natural size, a b, Basicranial axis; b c, b' c', plane of the occipital foramen; d d' hinder end of the palatine bone; e e' front end of the upper jaw; TT', insertion of the tentorium.