82 



COMPARATIVE ANATOMY. 



(except in Anteaters 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 SHOW THE RELATIONS BETWEEN 

 THE CRANIAL AND VISCERAL PORTIONS. 



According to recent researches the premaxilla appears to 

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

 middle line it bounds a canal which forms a communication between 



