CELL MASSES IN THE FOREBRAIN 421 
medial wall of the temporal pole and confirms the conclusion 
based on the study of the cells. 
In the temporal pole the hippocampus comes into contact 
with the general pallium and the large-celled amygdaloid nucleus 
only, not at all with the nucleus of the lateral olfactory tract 
or any of the small-celled portion of the amygdaloid complex 
(fig. 8). The hippocampal formation is intimately related in 
front with the olfactory bulb and secondary olfactory centers. 
Caudally it forms the border of the pallium adjacent to the 
choroid fissure and is bounded on the other side by general pal- 
lium. There is no continuity of cell masses between the caudal 
end of the hippocampus and the caudal part of the secondary 
olfactory centers. The olfactory apparatus taken as a whole 
does not form a complete ring following the line of junction of the 
hemisphere with the brain stem (‘limbic lobe’). An opening in 
this supposed ring occurs between the nucleus of the lateral ol- 
factory tract and the hippocampus. 
THE GENERAL PALLIUM 
The general pallium occupies the dorsal and caudal walls of 
the hemisphere and reaches well into the temporal pole. Through- 
out its whole extent it is interposed between the hippocampus 
on the one hand and the pyriform lobe and nucleus of the lateral 
olfactory tract on. the other.’ The pyriform lobe and hippo- 
campus meet one another in front of the rostral end of the general 
pallium near the olfactory peduncle (fig. 7). The general pal- 
lium extends forward slightly further. than is shown in the model. 
The presence of a subiculum between the hippocampus and 
general pallium and of a definite boundary line between the 
dorsal border of the pyriform lobe and the general pallium has 
been described above. 
Only the most general features in the structure of the pallium 
can be described in this paper. By far the greater part of the 
cell bodies are collected in a dense layer near the ventricle. At 
the dorso-medial border the cells are mostly pyramidal and there 
are a few cells scattered in the outer part of the pallium. There 
are many more of the peripheral cells in the adjacent subiculum. 
