THE SKATE. 75 



1 86. T\vo large bundles of nerves proceeding one from 

 either side of the medulla oblongata, beneath the restiform 



FIG. 26. Raja nasuta. External view of the roots of the 5th, yth, 

 and 8th cerebral nerves of the left side (nat. size). 



V a . F a/ , ventral or anterior roots of the trigeminal : F b , dorsal or 

 posterior root of the same : VII, VII', roots of the portio dura : VIII, 

 root of the auditory nerve. 



bodies. Each bundle is seen to consist of an anterior 

 smaller and a posterior larger fasciculus. The former (Figs. 

 23, 26, and 27 V' A ] goes to form the inferior ramus of the 



VDT 



FIG. 27. Raja nasuta. The principal branches of the 5th, 7th, and 

 8th cerebral nerves (nat. size). 



F a , ventral and F b , dorsal root of the fifth: F Ia , dorsal, and F' b , 

 ventral ramus of the orbito-nasal nerve : F 2a , palato-nasal nerve : _F 2b , 

 maxillary nerve : F 3 , mandibular nerve : pt.qu, nerve to upper jaw^. 

 na, nerves to the region of the nostrils : VII, portio dura : VIII, 

 auditory nerve. 



first division of the fifth nerve, and the main part of its 

 third division, besides contributing fibres to the second 



