THE BRAI:N T . 



141 





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



BBAIN. 



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; V.cm, common ventricle ; Ep, 

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



FIG. 114. BRAIX OF PER<;H (Perca srhraetser). (Side view.) 



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



Lol, olfactory lobe ; J'77, basal part of prosencephalon ; ZH, thalamencephalon ; .1/77, 

 mesencephalon ; EH, metencephalon ; 3*77, myelencephalon ; R, spinal cord ; 

 7, olfactory nerve ; 77, optic chiasma ; V, trigeminal ; UL, lobi inferiores ; Se, 

 central sulc-us at the bottom of the sinus rhomboidalis ; Lp, lateral elevations 

 of the cerebellum (lobi posteriores). 



