416 J. B. JOHNSTON 
celled nucleus continues over the medial surface of the basal 
lobe of the ridge to its caudal end. 
Further evidence as to the individuality of this nucleus is 
found in its fiber connections. Only the general disposition of 
its chief tract will be described here. In the extreme tip of the 
temporal horn of the ventricle (figs. 10, 13, 14) is seen a small 
ridge which follows the ventro-rostral border of this nucleus. 
It is clearly seen in the model and in sections.in all planes. This 
ridge is composed chiefly of fibers which run caudad over the 
medial surface of this nucleus. In addition to the bundle which 
forms the ridge there is a thin sheet of fibers in small fascicles 
covering the whole medial face of this nucleus. All of these fibers 
gradually disappear as they are traced caudad over this nucleus, 
in which they have either their origin or ending. Traced rostrad 
all these fibers pass through the tail of the caudate as a thick 
bundle. Here the bundle is just lateral (internal) to the stria 
* medullaris as that bundle rises from the nucleus of the lateral 
olfactory tract to enter the thalamus. The bundle here described 
now forms the most compact part of the stria terminalis and in 
addition a large part of its fibers go forward diffusely in the sub- 
stance of the caudate nucleus. A further discussion of the 
relations of this bundle will be reserved for a later study of the 
stria terminalis system. It is evident, however, from the facts 
given, that what is here described as the medial large-celled 
nucleus belongs to the amygdaloid complex and the distribution 
of the stria terminalis bundle confirms the observations as to its 
extent, based upon the character and grouping of cells. 
Dorsal ventricular ridge. Farther caudally in transverse 
sections the ventricle pushes around both laterally and ven- 
trally until the whole ventricular ridge is seen attached to a 
pallial wall and no longer to the brain stem (figs. 11, 12). In 
this pallial wall the extent of the general pallium and hippo- 
campal formation can be made out, at least roughly, as repre- 
sented in the model. The dense, deep layer of cells of the pallium 
turns into the ventricular ridge where it is continued by layers 
of cells lying adjacent to the ventricle. The sparsely scattered _ 
cells in the outer part of the pallial wall are continued into the © 
