PISCES. 31 



from tliis to communicate with the auditory nerve before it reaches its 

 destination. It communicates with the auditory on the large sac of the 

 labyrinth, and gives filaments to the termination of a semicircular canal ; 

 it then passes out to give filaments to the surface of the first and that of 

 the opposite one of the adjoining division of the gills, and the membrane 

 of the mouth. 



FIG. III. 



IT shows the ventricle extending from between the crura of the anterior lobes into 

 the optic lobes and the cerebellum. Parts of the processes of the oblong medulla 

 giving origin to portions of the fifth nerve have been removed, and the ventricle has 

 been exposed for showing its communication with the ventricles of the brain. 



FIG. IV. 



THE cerebellum has been removed for showing the ventricles throughout to the 

 calamus scriptorius. 



