540 



ZOOLOGY 



SECT. 



orbit behind ; the upper one is formed from the parietal (par). 

 The facial region is comparatively short. The premaxillse (p. max) 

 are not greatly developed. There are distinct paroccipital pro- 

 cesses (p. oc,). The periotic and tympanic are ankylosed together, 



par 



p.m 



FIG. 1156. Skull of Hyrax. Letters as in FIG. 1132. In addition, int. par. interparietal ; 

 ty. tympanic. The suture between the frontal and parietal has been by an error made to run 

 behind the post^orbital process. 



ME 



FIG. 1157. Section of skull of African Elephant (Elephas africanus), to the left of the middle 

 line. a. n. anterior nares ; ME. mesethmoid ; p. n. posterior nares ; Vo. vorner. (After Flower.) 



but not to the squamosal. The tympanic (ty.} forms a bulla with 

 a spout-like prolongation. 



In the Proboscidea (Fig. 1157) the bones of the skull are of 

 enormous thickness, the inner and outer tables being separated by 



