352 



MANUAL OF ZOOLOGY 



SECT. 



indistinctly divided into lobes, the cerebellum (ffff) is the 

 anterior portion of the hind-brain. The posterior division 



FIG. 205. Dorsal view of the brain of Dog-fish (Scyllium canicula). The posterior 

 division of the brain is the medulla oblongata (AT//), on the dorsal surface of 

 which is shown one of the cerebral ventricles (F. rho). The large cerebellum 

 (////) nearly covers the optic lobes (MH ). The diencephalon (ZH) shows in 

 the middle one of the cerebral ventricles, and the place of attachment of the 

 pineal body (/). The prosencephalon (VH~) gives off the olfactory lobes 

 (Tro,L.ol). The following nerves are shown: optic (//), trochlear (/'), 

 trigeminal (F),. facial (F/7), auditory (VIII\ glossopharyngeal (fX), and 

 vagus (A'). (From Wiedersheim.) 



of the hind-brain, or medulla oblongata (NH\ is broad in 

 front, and tapers posteriorly where it passes into the spinal 

 cord. 



