THE INTEBNAL SKBlBTOjr. 



185 



in which the palatine and maxillo-palatine processes remain quite 

 ,separate from the vomer (which tapers anteriorly), so that there 

 is an antero-posterior cleft in the skull on either side of it, is 

 called a Schizognaihous or " cleft " skull. Such a condition may 



Fig. 152. 



masp. 



Ventral View of the Skull or A Eaven (after Oaies). 



vo, Vomer; mxp, maxillo-palatine process ; pa, palatine ; ^i^, pterj-goid; 



q, quadrate ; J.spA, basi-sphenoid; sph.r, sphenoidal rostrum. 



Behind the basi-sphenoid is the large occipital foramen or foramen 



magrmm, at the middle of the front margin of which is a rounded 



prominence, the occipital condyle. The foramen magnum is bounded 



on each side by a lateral occipital bone, or exoccipiial. 



be seen in the Fowl. A skull in which, on the contrary, the 

 inaxillo-palatine processes form a continuous transverse ossifi- 

 cation is called a Desmognaihous skull, and the Duck's will 

 serve as an example. A skull wherein the maxillo-palatines 



