OKANG OUT AN©. 



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which slope down toward the temporal fossae. The 

 frontal spine is continued a little farther down, and 

 the depression which receives the cribriform plate 

 of the oethmoid bone, is much deeper and smoother 

 on the sides ; while the apertures in that bone, for 

 the passage of the olfactory nerves, are considerably 

 larger. The crista galli is smaller. The tempo- 

 ral fossae differ from the corresponding parts in man,, 

 in being much less marked by inequalities, and they 

 extend more toward the base of the skull. The 

 pars petrosa is less prominent, and smoother. The 

 sella turcica is almost in the centre of the cranium ; 

 the posterior clinoid process being two inches from 

 the edge of the frontal, and but 2.3 from the occipi- 

 tal spine ; whereas, in a human skull, the propor- 

 tions were found to be as 2.5 to 3.8. Though the 

 cerebellum is large, the fossae which lodge it are- 

 not very distinctly divided from the posterior fossae, 

 destined to receive the cerebrum. Indeed, instead 

 of the well denned boundaries traced in the human 

 skull by the crucial ridge, we found them marked 

 by a flat undulation of the occipital bone. The ca- 

 vity of the cranium measures from the interior edge 

 of the frontal spine, to the middle of the crucial 

 ridge, 3.9 inches ; and from side to side 3.5 inches. 

 The foramen magnum of the occipital bone, is si- 

 tuated considerably farther back. There is no mas- 

 toid, and scarcely a vestige of a styloid process. 

 The situation of the former is marked by a rough- 



