82 



COMPARATIVE ANATOMY. 



(except in Auteaters and some Cetacea) do not take part in its 

 formation. 



FIG. 66B. LONGITUDINAL VERTICAL SECTIONS THROUGH THE SKULLS OF 

 A, DEER, B, BABOON, AND C, MAN, TO snow THE RELATIONS BETWKI.N 

 THE CRANIAL AND VISCERAL PORTIONS. 



According to recent researches the pre maxilla appears to 

 originate primitively by a double ossification on each side. In the 

 middle line it bounds a canal which forms a communication between 



