XIII 



PHYLUM CHORDATA 



545 



hand, there is no such union ; the fibres of the tsenia run towards 

 the foramen of Monro, where they become divided into several sets. 

 Of these one set, constituting the great majority of the fibres, 

 pass into the hippocampus of the opposite side, giving rise to a 



B 



SB 



iNH 



n 



C 



VIT 



FIG. 1133. Brain of Dog. A, dorsal ; B, ventral ; C, lateral aspect. B. ol. olfactory lobe ; Cr. ce. 

 ,-K-.V; T?; rpT-oot l/->nrritnHiiiQl fi=iiT-p ffff ffff' lateral lobes of cerebellum : Him. 



ispli 

 Wiedersheim's Comparative Anatomy.) 



hippocampal commissure (hip. com.), the great development of which 

 readily leads to its being mistaken for a corpus callosum. The fibres 

 entering into the formation of this commissure correspond, however, 

 not to the fibres of the corpus callosum, but, as proved by their 



VOL. II N N 



