158 



;^ooL()OY 



KKCT. 



capsule. Tho^'diencephalon (-^/f) is comparatively small : its roof 

 is very thin, while the tloor is composed of two thickish masses 



B 



^'■"^^ 



\J/J 

 II FLESH 



Y \Yr mix X 



VMI 



Sv 



Fio. S21.— Brain of ScyUium canicula. A, dursal view; B, ventral view; C, lateral view. 

 F. rlin. fossa rhiinilji>irl;ilis (fcartli veiitriele); ^'/S eiiiiihysis ; ////, eerebellum ; Hti. H, hypo- 

 physis ; i. ol. olfactory bulb ; MH, niiii-brain ; A7/, nicduUa oblonjfata ; Sc, saccus vasculosns ; 

 Tio, olfactory jiedunclc ; UL, lobi inferiores : VII, prosencephalon; ZH, diencephalon ; 

 //, optic nerves; ///, oculomotor; IV, pathetic; K, trigeminal ; VI, abducent; VII, facial; 

 VIII, auditory ; IX, glossopharyngeal ; .V, vagu.s. (Ti-om Wiedcrslicim's Comp. Analmny.) 



— the Optic thalami. Attached to the roof is a slender tube 

 the efiphysis cerebri or jnncal hoc^y (T/^J.), which runs forwards and 



