336 MR. W. H. FLOWER ON THE BRAIN OF MYCETES. [June 28, 
found. Through the resources of the Society’s Gardens, I am now 
able to supply the deficiency ; and it is interesting to find that this 
hitherto undescribed brain presents such striking peculiarities of con- 
formation as to render a figure of it well worthy of a place in our 
‘ Proceedings.’ 
The entire weight of the animal (an old male, which died in the 
Gardens in October 1863) was 7 lbs. 94 ozs. avoirdupois, the body 
being in an extremely emaciated condition. The encephalon, imme- 
diately after removal, weighed 740 grains, or nearly 5 of the whole 
weight. The capacity of the cranial cavity was 43 cubic inches. 
The greatest length of the cerebral hemispheres when fresh was 2°4", 
their greatest breadth 1:7": After having been immersed for some 
days in spirits, the length had diminished by shrinking of the brain- 
mass to 2°25'; and upon the brain which had suffered this slight 
contraction the dimensions given below were taken. 
As regards their general form, the cerebral hemispheres, taken 
together, may be described as depressed, moderately broad, with the 
upper surface very little arched, the sides flat and parallel, the poste- 
rior end rather abruptly truncated, and in front narrowing rapidly 
to an obtuse point. The frontal lobes are small, flat above, and 
deeply excavated below for the roof of the orbits; the temporal 
lobes are full and rounded ; the parietal lobes broad and flat ; and 
the occipital lobes short, broad, and shallow, not more than just 
covering the whole of the cerebellum. The olfactory lobes project 
0-2! beyond the cerebral hemispheres in front. 
The base of the brain offers few special characters. The corpora 
albicantia are quite distinct from each other. The tuber cinereum 
large. The pons varolii 0°4" long and 0°7" broad. The olivary bodies 
0-2" long, by nearly 0-1" broad. The limits of the corpora trape- 
zoidea can be readily defined. The anterior pyramids strongly 
marked, each 0°15" broad. 
The cerebellum is of moderate dimensions, and has a very large 
and prominent flocculus standing out horizontally on each side con- 
siderably beyond the hemispheres. The vermiform process, 0°3!' broad, 
projects posteriorly slightly beyond the limits of the hemispheres. 
The latter have the same form as in the Primates generally. The 
breadth of the cerebellum across the hemispheres is 1°25", across 
the floceuli 1:5". 
The corpus callosum measures 0°9" in length, or, compared with the 
entire length of the cerebrum, as 37 to 100. The antero-median 
portion of the hemisphere (parts in front of the hinder edge of the 
hippocampus major) measured internally 1-4", the posterior (equi- 
valent to the ‘ posterior lobe,’’ and containing the “ posterior cornu,”’ 
&c.) 0°7", or as 100 to 50. 
To return to the surface of the cerebral hemispheres, the sulci are 
distinct and deep, but not numerous or complex, and with very few 
secondary grooves. ‘There is a tolerably close general bilateral cor- 
respondence, though not extending to all the details. 
A. Sulei upon the outer surface.—Sylvian fissure. This great 
fissure, the complete development of which is characteristic of the 
