16 MR. F. E. BEDDARD ON THE [Jan. 20, 
hemisphere of a brain of S. hypoleucus. 'This I have not seen in 
Nasalis. 
This same brain (of S. priamus) and a brain of S. entellus 
show on both sides an unusual condition of the inferior temporal 
fissure, which is well developed and runs parallel with the Sylvian 
and parallel fissures. The more usual condition in this genus isa 
much shorter fissure which is more transverse in direction, and 
that is the condition which obtains in Wasalis. The fissure is 
not figured at all by Kiikenthal and Ziehen, but is mentioned 
as being very feebly developed. Another furrow which I find to 
vary in the Semnopithecus brains at my disposal is the calloso- 
marginal sulcus; it sometimes bends up and cuts the surface of 
the brain. In Wasalis it always does. 
§. The Brain of CoLoBuS VELLEROSUS. 
Broadly speaking the brain of this monkey is very like that 
of a Macaque. ‘There are, however, a few small points of 
difference, of which one at any rate may be of some little 
significance. The resemblance is so close in most particulars that 
it is really unnecessary for me to describe the brain in detail. 
The drawing exhibited herewith (text-fig. 5, p. 17) will adequately 
prove my statement. I may, however, remark that the fissure of 
Rolando quite cuts the inter-hemispheral suleus: that the post- 
centralis is well marked on both sides: that the precentralis 
superior is recognizable and has a direction parallel with the long 
axis of the brain. On one side (the right) the Sylvian and 
parallel fissures join above, as is so common on both sides with 
the Macaques. The occipital lobe is very smooth, as is often the 
case with the Macaques, and the lateral occipital sulcus is hardly 
marked at all. The cross-piece of the characteristically Macacine 
calearine fissure is visible when the brain is inspected from above. 
A small fissure, which I have not observed in other Old World 
Monkeys, is to be seen on either side, behind the Simian fissure, 
and running parallel with the longitudinal axis of the brain. 
Kiikenthal and Ziehen figure, but give no name to an apparently 
similar fissure (lettered 5) in the brain of Lagothrix humboldti. 
I am able to confirm their demonstration of fact. They do not 
figure the same fissure in any of the Cercopithecide. 
Tam unwilling to seem to emphasize too strongly this point of 
likeness between the African Colobus and the New World 
Lagothrix ; but I may remind zoologists that likenesses between 
Colobus and the New World Monkeys have been pointed out. 
More important than this, however, is the light which the 
brain-structure of Colobus appears to throw upon its relationship 
to other Old World genera. On account of the structure of its 
stomach, and for some other reasons also, Colobus has been 
associated with Semnopithecus into a subfamily Semnopithecine, 
contrasted with the Cercopithecine which embraces the remaining 
Cercopithecidee. It should be plain from the statements made in 
