1902-a] Abdominal Viscera o/Cercocebus fuliginosus, etc. 525 
of the oesophagus, which reminds one very much of the condition 
of the fundus of the human stomach at the third month of foetal 
life as figured by Keith and Wood Jones (9) ; but here it is bent 
caudal wards and almost at a right angle upon the rest of the 
stomach. It is a little less in diameter than the immediately 
adjoining part of the stomach, and is bluntly pointed. Its 
internal characters also separate it from the rest of the stomach, 
and ally it with the saccular fundus of Cercocebus ; for its walls 
are comparatively thin and smooth, whereas in the major part of 
the stomach there are conspicuous longitudinal folds of mucous 
membrane which end abruptly at the entrance to the appendage 
in much the same manner as did the similar folds in the Old 
World monkey. It is not without reason, therefore, that one may 
look upon it as homologous with the fundus of the stomach of 
Cercocebus , and consequently of man. As in Cercocebus , here also 
a microscopic examination would have been of great interest, had 
it been possible to make one. 
The pyloric portion of the stomach, though bent upon itself, 
does not change its direction so suddenly as in the other monkey 
dissected ; and the constriction, which may possibly demarcate a 
pyloric canal, is about 40 mm. from the pylorus, and is not very 
distinct. The pylorus projects into the duodenum, but to a lesser 
degree than in Cercocebus. 
Small Intestine. — As in Cercocebus , so in Lagothrix the duodenum 
can be divided into two parts ; the first of which runs almost 
straight caudalwards, just to the right of the mesial plane, until it 
reaches almost to a level with the caudal extremity of the right 
kidney, and nearly to a level with the opening of the ileum into 
the caecum. This portion of the duodenum is about 70 mm. long, 
and at its termination the intestine turns sharply upon itself and 
to the left. The second part is shorter than the first, being 
scarcely 50 mm. in length. It runs cephalwards to the left of 
the first part ; and lies immediately to the left of the mesial plane. 
It ends by making a fairly sharp turn in a ventral direction, and 
so becomes continuous with the jejunum. Here, as in Cercocebus 
that part of the small intestine which has no mesentery has been 
called duodenum ; as soon as a mesentery appears the jejunum 
has been taken to commence. 
