GENERAL MORPHOLOGY OF THE NERVOUS SYSTEM. 



29 



Fig 1 1 -The mesial surface of the right half of the brain of a selachian Squalus 

 acalils io show the secondary segments of the brain the lo-g^t-dmal zones o 

 the medulla oblongata, the form of the ventricle and the pos t,on of the mfenor 

 lobesTdorsalsac,pa?aphysis,etc. The olfactory bulb is not drawn (compare Fig. M?)- 



