202 Journal of Comparative Neurology. 



fibrillar substance and near the median line. Near the lower 

 surface of the inner calyx they turn outward over the anterior 

 root. 



XXII. Three groups that may be considered as one on 

 account of their situation below the neck of the morula have 

 their processes directed upwards toward the neck. 



XXIII. In the lateral lower side of the central cerebral 

 mass are several groups. One large one at the posterior lower 

 edge of the inner optic mass sends its processes straight forward 

 into the fibrillar mass forming the anterior lateral angle of the 

 brain below the anterior optic tract. 



XXIV. Another group inside the last sends its fibers into 

 the adjacent posterior angle. 



XXV. A little above the group just noted is another that 

 sends its fibers in among the terminations of the posterior optic 

 tracts. 



THE CELLS OF THE VENTROCEREBRON. 



Excepting the dorsal surface the whole of the ventro-cere- 

 bron is covered with a mass of cells all of which are of consid- 

 erable size, but largest ventrally. Among them may be distin- 

 guished seven principal groups. 



XXVI. A ventro-median group between the origin of 

 the maxillary nerves sends a band of fibers directly through the 

 mass above, passing behind a group of commissural fibers 

 among which may be those of the transverse oesophageal com- 

 missure to the dorsal surface. 



XXVII. A second ventro-median group also occurs be- 

 tween the origins of the labial nerves. Its fibers after reaching 

 the neighborhood of the dorsal surface separate and apparently 

 reach the latter, 



XXVIII. Between this group and the origin of the nerve 

 is another of large cells whose processes form a distinct tract 

 passing upward and outward just outside of the ventral column 

 at the level of which it branches, one half continuing upward 

 and forward towards the commissural region, the other turn- 



