XL] 



PERISSODA CTYLA. 



187 



compressed, hamular processes. There is a distinct alis- 

 phenoid canal for the passage of the internal maxillary artery. 

 The base of the cranium is long and narrow. The glenoid 

 surface for the articulation of the mandible is greatly extended 

 transversely, concave from side to side, convex from before 

 backwards in front and hollow behind, and is bounded 



Ma, 



ExO 



oc. 



FIG. 60. Side view of the posterior part of the skull of a Horse, \. Fr frontal (the 

 line points to the postorbital process) ; Sq squamosal ; Pa parietal ; SO supra- 

 occipital ; E.i'O exoccipital : oc occipital condyle ; // paroccipital process ; Per 

 mastoid portion of periotic ; pt post-tympanic process of squamosal ; th tympano- 

 hyal ; Ty tympanic ; pg postglenoid process of squamosal ; As alisphenoid (the 

 line points to the plate of the bone which bridges over the alisphenoid canal) ; Ma 

 malar. 



posteriorly, at its inner part, by a prominent postglenoid 

 process (Fig. 60, pg). 



The squamosal (Sq) enters considerably into the forma- 

 tion of the temporal fossa, and besides sending the zygo. 

 matic process forwards, it sends down behind the meatus 

 auditorius a post-tympanic process (pt), which aids to 

 hold in place the otherwise loose tympano-periotic bone. 



