THE INTERNAL SKELETON. 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 Schizognathous or “ cleft” skull. Such a condition may 
Fig. 152. 

VenTRrAL View or THE SKULL OF A Raven (after Oates), 
vo, Vomer ; mxp, maxillo-palatine process ; pa, palatine; pig, pterygoid ; 
g, quadrate ; b.sph, basi-sphenoid; sph.r, sphenoidal rostrum. 
Behind the basi-sphenoid is the large occipital foramen or foramen 
magnum, 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 ocvipital bone, or exoccipital. 
be seen in the Fowl. A skull in which, on the contrary, the 
maxillo-palatine processes form a continuous transverse ossifi- 
cation is called a Desinognathous skull, and the Duck’s will 
serve as anexample. A skull wherein the maxillo-palatines 
