512 



ZOOLOGY 



SECT. 



only gives rise to a tube for the external auditory meatus, but also 

 forms the lulla tympani, a dilated bony process containing a cavity. 



The occipital region presents two condyles for the articulation of 

 the atlas. 



The mandible consists in the adult of one bone, the equivalent 







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of the dentary of Sauropsida, on each side the two rami, as they 

 are called, being in most Mammals closely united at the symphysis. 

 The mandible articulates with ; 'an articular surface formed for it by 

 the squamosal bone, below v the posterior root of the zygomatic 

 arch. 



