THE SKULL. 



7/7 



ar 



FIG. 65. SKTJLL OF A WILD DUCK (Anas boschas). A, from above ; B, from below ; 



C, from the side. 



a.l.s, alisphenoid ; ag, angular ; ar, articular ; a.p.f, anterior palatine foramen ; b.t, 

 basitemporal ; b.o, basioccipital ; b.pg, basipterygoid ; b.s, basisphenoid ; d, 

 dentary ; e.n, external nostrils ; eth, ethmoid ; e.o, exoccipital ; e.u, Eustachian 

 aperture ; fr, frontal ; f.m, foramen magnum ; i.c, foramen for internal carotid 

 artery ; j, jugal ; Ic, lacrymal ; mx.p, maxillopalatine process ; mx, maxilla ; 

 n, nasal ; n.px, nasal process of the premaxilla ; px, premaxilla ; p, parietal ; ps, 

 presphenoid ; pg, pterygoid ; pi, palatine ; p.n, internal nostrils ; q, quadrate ; 

 q.j, quadratojugal ; sq, squamosal ; s.o, supraoccipital ; ty, tympanic cavity ; 

 v, vomer ; II, foramen for optic nerve ; V, for trigeminal ; IX, X, for glosso- 

 pharyngeal and vagus ; XII, for hypoglossal. 



