520 WILLIAM H. F. ADDISON 
the corpus striatum of each side forms the surface as a convex 
oval area, the lobule désert or désert olfactif of Broca. The parol- 
factory cortex is also much reduced, but at least some definite 
remains of it are seen. This is interesting in the light of Edin- 
ger’s view, that the tuberculum olfactorium is not a part of the 
olfactory system, but is the end-station of tracts conveying 1m- 
pulses by way of the fifth nerve from specialized sensory struc- 
tures in the snout region. ‘To the sense, which this mechanism 
serves, he has given the name ‘oral sense.’ 
Of the several connections of the olfactory and parolfactory 
cortical cells with the hippocampus, none were seen with cer- 
tainty. It is possible that from the parolfactory cortex some 
fibers of the fasciculi parolfacto-hippocampo-septales (Zucker- 
kandl’s bundle) are still retained, but as the origin as seen in 
these sections was doubtful, and as they normally pursue most of 
their course with the fornix fibers, one cannot decide definitely 
from the material at hand. 
Of the other possible connections of the olfactory and parol- 
_factory cortical cells, both the stria medullaris thalami (taenia 
thalami) and the taenia semicircularis are seen, as are their re- 
spective end-stations the ganglion habenulae and nucleus amyg- 
dalae. The latter are both quite definite. 
The hippocampi are very degenerate small structures, and it 
is with difficulty that one sees the analogy with even the micros- 
matic type of hippocampus. The fissura hippocampi is shallow 
but definite and the subiculum is present. The gyrus dentatus 
does not appear as a separate structure, but there are cell-groups 
which evidently indicate the position of what remains of it. 
Connected with the hippocampus is the fimbria, seen as a slender 
band of fibers. True fornix fibers are seen, and can be followed 
in sagittal series of sections When I reported, in a preliminary 
way, at the meeting of the American Association of Anatomists 
in December, 1914 (Anatomical Record, vol. 9, no. 1) this was 
not known to me, but this information has been kindly trans- 
mitted by Professor Edinger since that time. The corpora 
mamillaria where the fornix fibers end are greatly reduced in 
size. The psalterium or commissura dorsalis, formed of cross- 
