106 MR. FLOWER ON THE BRAIN OF THE JAVAN LORIS. 
pedicle springing from the middle of its anterior margin to the infundibulum, and 
divided by a transverse groove into two lobes, of which the posterior is much the 
smaller. The crura cerebri are of moderate size. The pons Varolii is not much elevated ; 
it is distinctly marked off in front, but very indefinitely separated from the medulla 
behind. The medulla oblongata is broad and flat anteriorly, the median groove distinct, 
its other divisions but faintly indicated. A slight longitudinal groove marks the outer 
boundary of the pyramidal bodies; but the olivary bodies make no projection on the 
surface, and the corpora trapezoidea are not well defined. The nerves appear all to rise 
in the usual situations. 
On separating the hemispheres above, while still in situ, the corpus callosum was 
seen to cover half of the anterior pair of the corpora quadrigemina. Of these bodies the 
anterior are the largest; they are flat and rounded in outline, narrower before than 
behind ; the posterior are small, but very prominent. The corpora geniculata are well 
marked ; the pineal gland small. On dividing the corpus callosum, the posterior part 
of the fornix was seen to be extremely broad, covering the optic thalami, and forming a 
broad, wide lamina (corpus fimbriatum) descending into each middle cornu of the 
ventricle. The hippocampus major is of moderate size. Although every care was 
taken to ascertain the extent to which the ventricular cavity extended into the posterior 
lobe, I was not able to do so satisfactorily : so readily do the layers of brain-substance 
separate in this direction, following exactly the curve of the bottom of the calcarine 
fissure, that it is difficult to distinguish an artificially formed from a natural cavity ; 
but, as I have elsewhere shown, the extent to which the walls of this portion of the 
ventricular cavity are adherent is of no anatomical or physiological importance, and 
varies even in the same species ; while, on the other hand, it is of consequence that, if 
the homologies of the calcarine sulcus as traced from Man through the Quadrumanous 
series to Stenops, Lemur, and Galago are true, the portion of cerebral grey matter 
answering to that forming the so-termed ‘“‘ hippocampus minor ”’ of the human subject, 
only of proportions corresponding to the greater relative depth of the calcarine sulcus, 
must exist in the brains of all these animals’. 
When a horizontal section had been made of the hemisphere, the length of the 
antero-median portion, measured to the posterior edge of the hippocampus major, was 
0-9 inch, and that of the posterior portion 0-4 inch, giving a proportion of 100 to 44,— 
being a shorter posterior lobe than in any of the true Apes that I have measured 
[ Hylobates excepted], and longer than in any of the inferior Mammalia. 
The cerebellum is 0°7 inch in breadth, and 0°4 inch in length. The upper surface is 
flat, rising but slightly in the median line, the superior vermiform process being much 
less distinctly marked than in Lemur, but forming a projection instead of a notch (as 
in the human subject) in the posterior border when seen from above. The lateral lobes 
are of moderate size, and more resemble those of the higher Quadrumana than those of 
" ««On the Posterior Lobes of the Cerebrum of the Quadrumana,” Phil. Trans. 1862, pt. 1, p. 185. 
