PLATE 19. 



A series of diagrams showing the angles between the frontal, parietal, and supra- 

 occipital bones, the basicranial axis, and the row of maxillary teeth in the Ox, Elk, 

 Okapi, Elephant, and Man. The diagrams are based upon the inner view of the right 

 half of sagittally bisected skulls, and the thick lines are drawn straight from point to 

 point, disregarding any curve of the bones that may occur between the points. The 

 basicranial axis is set horizontally in each diagram. 



A. — The middle of the front end of the presphenoid bone. 

 B. — The hind edge of the basioccipital bone. 

 FM. — The superior edge of the foramen magnum. 

 FP. — The suture between the frontal and parietal bones. 

 NF. — The suture between the nasal and frontal bones. 

 PO. — The suture between the parietal and supraoccipital bones. 

 TT.— The line of maxillary teeth. 

 The line xy is drawn from the point PO parallel to the line TT, and from the right- 

 hand end of the line TT a perpendicular line {perp.) is erected to meet it. 



XIV 



