PISCES. 25 



5. Fifth nerve, arising from the restiform body, and dividing into several large 



branches, to be distributed on the muscles and skin of the head and face ; 

 many of those given to the skin pass in filaments through openings in the 

 bone. 



6. Posterior branch of the fifth, receiving a filament from one of the bundles about 



to form the trunk of the par vagum, and being continued to communicate 

 with the nerves of the fins, as in 1, Plate VII. 



7. Sixth, or abducent nerve. 



8. Auditory nerve, arising from the restiform body, near the fifth, and giving 



branches to the semicircular canals, and the sac containing the stone. 



9. Trunk of the par vagum, arising from the restiform body. 

 10. First spinal nerve. 



FIG. II. 



THE BASE OF THE BKAIN, AND THE OKIGINS OF 



THE NEEVES. 



a. ANTERIOR lobes of the brain. 



b. Mammillary eminences, which are much larger than in the skate ; the pituitary 



gland has been removed. 



1. Olfactory nerve. 



2. Optic nerve, arising from the optic lobe and the mammillary eminence, and 



crossing its fellow to terminate in the retina. 



3. Third nerve, arising from the base of the brain, in the track of the pyramidal 



body, a little behind the mammillary eminence. 



4. Fifth nerve, arising entirely from the restiform body. 



5. Sixth nerve, arising from the base of the brain, in the track of the pyramidal 



body. 



E 



