392 



THE DOGFISH 



LESS. 



form and size. Connected with the dorsal region of the 



FIG. 105. Dorsal view of the brain of the Scy Ilium canicula. 



The posterior division of the brain is the medulla oblongata (NH\ 

 on the dorsal surface of which is shown one of the cerebral ventricles 

 (F. rho\ 



The large cerebellum (HH) nearly covers the optic lobes (MH). 

 The diencephalon (ZH) shows in the middle one of the cerebral ven- 

 tricles, and the place of attachment of the pineal stalk (Gp). 



The prosencephalon ( VH] gives off the olfactory lobes (Tro, L. ol.}. 



The following nerves are shown : optic (//), trochlear (IV), tri- 

 geminal ( V], facial ( VII) t auditory ( K//7), glossopharyngeal (IX), and 

 vagus (X). 



(From Wiedersheim.) 



diencephalon is ite pineal body (Fig. 103, pin\ representing 



