the horizontal and posterior semicircular canals communi- 

 cating with it. The epiotic recess (recessits vestibularis 

 epioticus) lodges the superior sinus and has the two vertical 

 canals communicating with it. 



The articulation of prootic with opisthotic and of both 

 with the epiotic region of the supraoccipitalissynchondrotic 

 the articulating cartilage is always large in quantity so 

 that in the macerated skull there is a three rayed cavity 

 in this situation {fossa spuria) [50]. 



In front of th< 

 a small but well 

 by two, sometimes three, apertures. This is the internal 

 auditory meatus (meatus acusiieiis interims), the two 

 apertures are the internal aperture of the facial canal 

 (eaualis facialis) [3(>] the lower and more anterior of the 

 two, and the anterior cribrose foramen (foramen erihrosum 



eochlea branch of the nerve is transmitted through a pos- 

 terior cribrose foramen, which in the macerated >kwll is 

 represented by the cribrose notch (inrisiira eribrosa) [~>i]. 

 In the complete skull theacust ie hiatus is Idled by cartilage, 

 which deepens and widens the internal meatus so that the 

 both cribrose foramina are within it. 



The facial canal tunnels through the prootic forwards, 

 laterally and downwards, its external aperture, is just 

 visible in the roof of the jugular canal, when that is looked 

 into from in front. 



In front of the transverse occipito-sphenoid synchondrosis 

 the basisphenoid is excavated to receive the anterior por- 

 tion of medullar oblongata. The anterior limit of this 

 "fossa meilulJaris " is an imaginary line joining the bases 

 of the postclinoid processes [451. In front of this line the 

 cranial lloor is lifted clear of the bony basis cranii by a 



