160 



COMPARATIVE ANATOMY 



f.b. b.o. B 



FIG. 130. BRAIN OF Scyllium canicula. (A, dorsal ; B, ventral ; and C, 



lateral view. )] 



f.b, prosencephalon ; b.o, olfactory bulb ; t.o, olfactory tract (very short in 

 Scyllium) ; th, thalamencephalon ; ep, base of pineal body ; if, lobi inferiores ; 

 h.p, hypophysis ; sc, saccus vasculosus ; m.b, mid-brain (optic lobes) ; h. b, 

 cerebellum ; m.d, medulla oblongata ; fr, fourth ventricle ; i-x, cranial 

 nerves (the ventral vagus roots are omitted from Fig. B. The epithelial and 

 vascular roof of the third and fourth ventricles has been removed. 



present on the infundibulum, and an " infundibular gland " or saccus 

 vasculosus is present on the sides and floor of the iofundibulum, 

 which is connected posteriorly with the pituitary body. 



