Raich Sweet 
14/3 
Fig. 2 A ventral view of the same brain as in figure 1. The diagonal band 
and the fibers imbedded in it are readily visible in the entire brain, although the 
fiber-bundles are much more delicate than those of the internal capsule. 
Fig. 3 A medial view of another specimen. (From Johnston 713 b, fig. 20.) 
The fissura prima curves forward over the parolfactory area. The fimbrio-den- 
tate sulcus runs longitudinally above it. The body between is the primordium 
hippocampi. Between the fissura prima and the lamina terminalis the diagonal 
band rises apparently to join the hippocampal primordium directly. The broken 
line indicates the boundary of the primordium as determined by internal struc- 
ture. The portion of the diagonal band seen on this surface of the brain is the 
homologue of the gyrus subeallosus. This figure shows the prominence of the 
rostral end of the pallium due to the pallial thickening. 
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