198 Journal of Comparative Neurology. 



small cells filling the central portion of the calyx-cups and their 

 general mass is in some places continuous with that filling the 

 latter, their -relation to which may be compared to the over- 

 flowing contents of a cup. They are found in the space be- 

 tween each pair of calices and in that between the latter and the 

 fibrillar mass below, anteriorly and posteriorly, and grade into the 

 mass of cells between the central mass and the fibrillar masses 

 of the optic lobes. No processes from any of them to the por- 

 tion of the brain beneath them have been seen in any of my 

 preparations, but in all they seem to be in some way closely re- 

 lated to the calices. In one instance a process was traced into 

 a calyx from a cell in the space between the pair of cups, and 

 this, branching there, exactly resembled the dendrites of the cells 

 inside. Since this was one of the earlier of my discoveries, and 

 since the boundaries of the cup are not always distinct in non- 

 stained, or bichromate of silver preparations, and since at this 

 moment I am unable to verify the matter, there is here a possi- 

 bility of a mistake. If not, and the cells are of the same order 

 as those inside the cup, their neurites must be looked for as 

 passing inside to the radiating bundles of fibers. 



Between the posterior margins of the stalks and immedi- 

 ately below the calices I have several times found larger cells 

 impregnated, whose processes passed in between the stalks and 

 up between the calices. Perhaps these may be the cells giving 

 rise to the fibers of the superior commissure, but the details to 

 be seen are too poor to warrant a conclusion. 



THE CELLS OF THE DORSO-CEREBRON, 



I. To proceed with the enumeration of the groups of 

 cells, there may first be noted a small group of medium sized 

 cells, situated dorso-antero-laterally beneath the outer calyx, the 

 processes of which pass almost directly backwards to the neigh- 

 borhood of the inner surface of the outer stalk and form the 

 processes giving rise to the fibers of the antero-superior optic 

 tract. 



II. Behind and below these, but in close proximity, is an- 

 other group of similar appearance, the processes of which form 



