THE BRAIN. 



HI 



FIG. 113B. TRANSVERSE SECTION THROUGH THE FORE-PART OF THE TELEOSTEAN 



BRAIN. 



fr, frontal bone, underneath which the pineal tube, Gp, is visible in transverse sec- 

 tion, and below this the pia mater, Pm ; Pa, the pallium, or roof of the secondary 

 fore-brain, formed of a simple epithelial layer; Kern, common ventricle ; Ep, 

 ependyma ; T y T, olfactory tracts at the base of the corpora striata (C.st). 



FIG. 114. BRAIN OF PERCH (Perm schraetser}. (Side view.) 



Jt 



FIG. 115. BRAIN OF Perea schraetser. (Dorsal view.) 



Lol, olfactory lobe ; Vff, basal part of prosencephalon ; ZH, thalamencephalon ; Afff, 

 mesencephalon ; HIT, metencephalon ; NH, myelencephalon ; R, spinal cord ; 

 /, olfactory nerve ; //, optic chiasma ; V, trigeminal ; UL, lobi inferiores ; Se, 

 central sulcus at the bottom of the sinus rhomboidalis ; Lp, lateral elevations 

 of the cerebellum (lobi posteriores). 



