82 



COMPARATIVE ANATOMY. 



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

 formation. 



4 



' '\\ 



I'M:. 66n. LONCI i rniNAi, VERTICAL SECTIONS Tinmrrm THE SKULLS OF 

 A, DI:I;K, I'., I!AI:C>UN, AND (', MAN, TO snow THE RELATIONS I:KT\VF.I:N 



I HE Cl:.\NIAL AND VlSt'KUAL 1'uKTIONS. 



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 



