OF DENISON UNIVERSITY. 
87 
the ectal layer. Into this felting pass the apical fibres of the pyramids 
of the smaller size or ectal series. It is not easy to trace the ultimate 
course of these fibres, but in some cases, at least, they obviously di- 
vide into two and are lost in the neuropilem above referred to. Be- 
neath the small pyramids at a variable distance is an ill-defined layer 
of larger pyramids whose apical processes seem also to pass into the 
neuropilem. Still entad of the giant pyramids are the usual multipolar 
cells adjacent to the white mater or fibre zone. More or less frequent 
in all of these layers, but especially entad, are large clear granular 
nuclei surrounded by unstained spaces which may represent the bodies 
of unstained cells of the aesthesodic type. In cases where the cell- 
body is stained it almost invariably has the apical process directed en- 
tad. The average length of the body of the small pyramids is about 
.03 min., while the giant pyramids are more than .04 min. exclusive 
of processes. 
The cortex of the crus, i. e. of the lateral aspects of the cerebrum 
below the rhinalis fissure is the same as that of the ventral part of the 
cortex farther caudad. 
Longitudinal perpendicular sections exhibit little difference be- 
tween the cephalic and caudal portions of the dorsal cortex although 
the latter portion seems to possess proportionally more of the second 
type of cells. 
In a section of the parietal region the neuroglia layer consists of an 
outer less densely stained layer and an ental layer which latter is suffused 
with stained matter evidently of an albumenous character. The in- 
ner layer may be called the ectal neuropilem zone because of its be- 
ing filled with the finely dividing process of layers within. The an- 
astamosis of these fibres, while very probable, has not been observed. 
The cellular elements in this layer are inoblasts of connective 
fibres and Deiter’s cells. Beneath the neuroglia is a band of cells 
forming the ectal portion of the cell-bearing cortex. The cells are 
small pyramids in part but a careful study shows that there are many 
cells of a somewhat different character, i. e. the peripheral process is 
not simple but branches dichotomously and then subdivides into a fine 
fibrilary felt. Immediately above and about this layer the felting of 
fibres is most dense and results frequently in a diffuse coloration rend- 
ering observation difficult. Beneath this layer there follow successive 
layers of small pyramids with some fusiform cells. The fibres from 
the apex in each case is continued to the ectal neuropilem zone there 
