OF THE MARSUPIALIA AND MONOTREMATA. 
651 
PLATE XXXVIII. 
Figs. 1 & 2. Brain of Kangaroo ( Macropus major). 
Figs. 3 & 4. Brain of Wombat ( Phascolomys vombatus). 
Figs. 5 & 6. Brain of Thylacine ( Thylacinus cynocephalus). 
Figs. 7 & 8. Brain of Echidna ( Echidna hystrix). 
Explanation of the Letters used in all the Figures. 
A. Crus cerebri, divided between thalamus 
opticus and corpus striatum. 
B. Body of corpus callosum. 
C. Genu of corpus callosum. 
D. Rostrum of corpus callosum. 
E. Splenium of corpus callosum. 
F. Anterior commissure. 
G. Septal area. 
H. Septum lucidum. 
I. Precommissural fibres. 
K. Body of fornix. 
L. Columns of fornix. 
M. Corpus fimbriatum. Edge of posterior 
crura of fornix. 
N. Psalterial fibres of corpus callosum. 
O. Ventricular aperture. 
P. Fascia dentata. 
Q. Hippocampal sulcus. 
R. Corpus striatum. 
S. Third ventricle. 
T. Peduncles of pineal body. 
U. Thalamus opticus. 
V. Corpora quadrigemina. 
