THE BRAIN. 



141 



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



BRAIN. 



/;, 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; I'.cm, common ventricle ; Ep, 

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



Lol 



r 



L. 



FIG. 114. BRAIN OF PERCH (Perm srhractser) . (Side view.) 



Jt 



I 

 FIG. 115. BRAIN OF Perca schractser. (Dorsal view.) 



Lol, olfactory lobe ; VH, basal part of prosencephalon ; ZH, thalamencephalon ; MH, 

 mesencephalon ; HH, 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). 



