4AS ON THE BRAIN OF MACROSCELIDES. 
backward and stretching it. This has not happened in Macro- 
scelides, and unfortunately I am unable to state what connection 
really exists between the corpus callosum and psalterium. In 
an examination of the mesial surface of the hemisphere with a 
lens, I was unable to find any connecting-link between the two 
commissures; nor did the histological investigation yield any 
more satisfactory result. 
And yet from what we know of the evolution of the corpus 
callosum, we can safely predict that when better material is 
available (which Dr. Broom assures me will soon be the case) 
a bridge will be found in the position marked «# in the diagram 
(fig. 2) joining the anterior limb of the psalterium to the under-leaf 
of the splenium. This bridge may not contain any nerve-fibres, 
and may thus realize a condition which we find in the Hapalide*, 
but there must at least be a narrow lamina of neuroglia. 
In the interval (y) between the corpus callosum and the 
psalterium there is a subsplenial hippocampal flexure of the 
usual structure, though of an unusually great size. I have 
traced the course of this flexure in a series of sections, and have 
been able to establish the fact that it does not differ essentially 
from that of Erinaceus. 
As soon as I get better material I hope to publish full details 
of the minute structure of this interesting brain, and to compare 
it in detail with that of Hrinaceus, Gymnura, Talpa, Chryso- 
chloris, Hemicentetes, Oryzoryctes, and Galeopithecus. 
I have written enough, however, to show that Parker’s remark 
concerning the skeleton, that “we have a curious mixture of 
Marsupial (Metatherian) and Eutherian characters,” might with 
equal truth be applied to the brain. 
* Cf. “The Relation of the Fornix,” Journ. Anat. & Phys. vol. xxxii. 1898, 
p. 52. 
