THE FISSURA HIPPOCAMPI 169 
young stages suggests a certain type of relative growth in the 
telencephalon. In measuring the growth of the histologically 
distinct regions of the telencephalon medium and the areas 
contiguous to them, lying in the evaginated portion of the hemi- 
sphere, we are able not only to measure the relative amount of 
growth of the telencephalon, but also to determine the manner 
in which this growth takes place. 
In the embryos studied the medial wall was observed to grow 
in the following manner: first, by the intrinsic growth in the 
midline, especially in the region of the lamina terminalis and 
in that of the di-telencephalic fold; second, by the out-growth of 
a series of arcs of new tissue which forms the incipient frontal- 
parietal, occipital, and temporal poles. 
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