XIXI 



I'llVLr.M CFIOKDATA 



213 



body {hp) is rounded and placed at the end of a liollow stalk : a 

 shorter offsiioot of the roof of the diencejDhalon may perhaps 



M-MIT 



B 



77/— 



~v 



-VJI 



m 



c 



.1/7/ 



jm 



YEiPa 



inr 



ITeA 



Ei/^M FZSo m 



Fig. 806.— Salmo fario. Dorsal (A), ventral (B), and lateral (C) views of brain. BG., Bus. 6. 

 corpora striata ; ch, crossing of optic nerves ; G. p, pineal body ; HE. cerebellum ; //y/i, 

 pituitary body ; [nf. infundibuluni ; L. ol. olfactory bulbs ; il/ct', spinal cord ; MH. optic lolics ; 

 NH. medulla oblongata ; Pall, pallium ; Sv. saccus vasculosus ; Tr. Opt. optic tracts ; U, L. 

 lobi iiiferiores ; VH, prosencephalon ; I—X, cerebral nerves ; A'/7, 1, first spinal (hypoglossal) 

 nerve ; ;.', second spinal nerve. (From Wiedersheim's Vertebmta.) 



represent a rudimentary pineal eye. Behind the pituitary body 

 is a saccus vasculosus {s, v.). The ojJtic nerves do not form a 

 chiasma, but simply cross one another, or decussate (C%.), on 

 VOL. II O 



