64 



LAND MAMMALS IN THE WESTERN HEMISPHERE 



making the bone very strong in proportion to its weight. 

 Sinuses are very generally present in the frontals and communi- 

 cate by small openings with the nasal passage, even in genera 



Fig. 8. — Skull of Wolf, top view. 

 P.Mx., premaxillary. Na., nasal. 

 Ma., malar or jugal. L., lachrymal. 

 Fr., frontal. Sq., squamosal. Pa., 

 parietal. S.O., supraoccipital. 



Nar 



Fig. 9. — Skull of Wolf, view of base. 

 P.Mx., premaxillary. Mx., palatine 

 process of maxillary. PL, palatine. 

 Ft., frontal. Pt., parietal. Ma., 

 malar or jugal. Sq., glenoid cavity 

 of squamosal. B.S., basisphenoid. 

 B.O., basioccipital. Ty., tympanic 

 (auditory bulla), p.oc, paroccipital 

 process. con., occipital condyle. 

 S.O., supraoccipital. 



of moderate size and with- 

 out horns or tusks. The 

 frontals form the roof of 

 the eye-sockets, or orbits, and usually there is a projection 

 from each frontal, which marks the hinder border of the 

 orbit and is therefore called the postorbital process. The roof 

 of the facial region is made by the nasals, which are com- 

 monly long and narrow bones, but vary greatly in form and 



