NERVES OF THE DOGFISH 



319 



Fig. 20 A horizontal section through a portion of the base of the cranium 

 from the optic commissure anteriorly to the anterior portion of the ear capsule 

 posteriorly, cutting the optic chiasma, the roots of the abducens nerve, the in- 

 ferior lobes, the saccus vasculosus and the anterior part of the medulla oblongata. 

 X15. 



