paper 1 the writer has indicated the existence < 



homology „f the ^\hluu/\!\ VV nJu n Z r'mu!! 

 following words : 



" Oommumres of th Cerebrum.— The exact equb 

 commissures of the cerebrum is a matter of much 

 these fishes where the whole dorsal and median j 

 tectum cerebri or mantle portion is apparently re 

 the pallium cerebri. Considering, however, that 

 in which the cerebrum has been differentiated ii 

 mals is caudad. and that, in the lower brains, hoc 

 caudad or dorsad in higher vertebrates must be >< 

 or cephalad, it is not difficult to homologize the 

 the plexus-bearing- projection from the po.^teru 

 margin of the mantle. Since the plexus in this 

 the vertex, instead of projecting from the eaud; 

 structures morphologically cephalad of the pie: 

 sought still further cephalad or ventrad. Using t 

 ol (serving thatithe cerebral cortex told- ventrad m 

 tory structure, we think we find a homologue oj 

 hippocampal commissure connecting the two h 

 cerebrum cephalad of the openings of the olfaen.i 



as well as 



