NERVOUS SYSTEM. VERTEBRATA. 



357 



pursues a course obliquely upward and forward for a con- 

 siderable distance (tig. 203, s). It thus presents a marked 



Fig. 203. 



Fig. 204. 



contrast to the " Sylvian fissure " of the Odontoceti. The 

 difference is further increased by the different arrangement 



