NEUVOUS SYSTEM. VERTEBRATA. 



103 



The basal ganglion is well developed and is clearly 

 divided into two lobes, an outer and anterior, and a median 

 and posterior the striatuin and epistriatum. Tho cavity 

 of the optic lobe is bounded in front by the displaced 

 tectum opticum and is occupied by the large torus semi- 

 circularis. 



Fig. 29. 



...OLF. BULB 



ANT. WING. 



.MID. WING. 



TOR.SEMICIRC. 



..POST. WIN 6. 



Brain of Mormyrus kannume. 



The cerebellum is small and tongue-shaped, with its 

 pointed apex directed forwards. Its base is separated in 

 front by a transverse groove from a small rounded emi- 

 nence the posterior part of the root of the valvula. Behind, 

 a similar but shallower groove divides it from a small lobe 

 (fig. 29, x.) said to resemble in microscopical features the 



