532 Proceedings of Royal Society of Edinburgh. [sess. 
of the liver of Lagotlirix are more distinct than those of Cercocebus.. 
The right lateral lobe is the largest ; the central lobes, taken 
together, come next in point of size ; the left lateral lobe is 
comparatively small (figs. 4 and 5). The most striking feature is 
the form and development of the caval lobe. Its omental lobule 
is not in any way remarkable. It resembles the same lobule in 
Cercocebus , except that there is no distinction into a dorsal and 
a ventral part, and there is no pointed projection. It has a tongue- 
shaped tuber papilla re which is in relation to the lesser curvature 
of the stomach. It is to the caudate lobule that the liver of 
Lagotlirix largely owes its peculiarity of form. This is so large 
that it extends for some distance beyond the margin of the right 
lateral lobe, and is extensively related with the diaphragm. A 
considerable area of it is visible when the liver is viewed from the 
cephalic aspect (figs. 4 and 5) ; and it is in cases such as this that 
a special term is required to designate the fissure between the- 
caval and right lateral lobes. The name of right dorso-lateral 
fissure has been suggested in an earlier part of this paper. It is 
probable that the large size of the caudate lobule is in some degree 
due to the pathological change which has affected the whole organ 
but there seems no reason for thinking that under normal con- 
ditions the lobule would not be relatively very large. The bridge 
of liver substance, crossing the vena cava ventrally and uniting the 
omental and caudate lobules, is thick and very evident. 
Spleen. — At the first glance, the spleen of Lagotlirix appears so 
different from that of Cercocebus , that a recognition of four 
surfaces seems to offer a task of great difficulty. It is very much 
elongated and flattened (PI. III. fig. 7), and reminds one of the spleen 
as seen in many Carnivora. It is closely applied to the parieties 
of the abdomen, and is, therefore, curved in conformity with the 
curve of the abdominal wall. And, having its dorsal extremity 
close to the vertebral column, the curve is extremely pronounced in 
the region of the apex. Tracing its curve from the apex, the 
spleen first runs dorsalwards ; then it forms a short sweep to the 
left ; after which the major part of the organ runs ventral wards 
with a certain amount of inclination towards the pelvis. The 
most ventral angle is exposed on opening the abdomen.* 
* The spleen struck one as being of larger size than was to be expected. 
