1902— 3. j Abdominal Viscera of Cercocebus fuliginosus, etc. 513 
which the part indicated as D in the figures begins. D passes 
almost straight caudalwards to the entrance to the pelvis, where 
it is continued by the rectum. This last piece of the colon is 
approximately in the mesial plane. 
Examined as a whole, the large intestine is seen to have a very 
variable calibre. The caecum is the widest part, and might almost 
be called saccular. As previously stated, the ascending colon is, 
at first, almost as wide as the caecum ; but later it narrows slightly. 
At the bend between the ascending colon and A there is a sudden 
reduction of calibre. A and B are of approximately the same 
width ; but where B ends and C begins there is a sudden increase 
in size, so that C is nearly as wide as the ascending colon. The 
second part of the horse-shoe-like piece of the colon is somewhat 
narrower than the part immediately preceding it ; and the part 
marked + in PI. II. fig. 4 is even narrower than A and B. D, on 
the other hand, is again wide, there being practically no difference 
between the diameters of C and D. This is the variation which 
was found in the particular Cercocebus dissected; but in what 
measure it may be due to different parts of the intestine having 
been distended with gas during the process of hardening, I do not 
feel in a position to say. In any case, the large calibre of the 
caecum and ascending colon does not appear accounted for as the 
result of gaseous distension. There does not seem to be any 
reason to doubt that these parts of the large intestine have retained 
their natural size. 
In all parts of the caecum and colon three longitudinal bands 
are found, one of the three being always along the line of 
attachment of the meso-colon where this exists. Owing to the 
numerous turns, these bands have no constant arrangement in the 
greater part of the colon ; but in the caecum and ascending colon 
they are disposed as follows : — One runs along the left side of 
both caecum and ascending colon. Another passes along the lesser 
curvature of the ascending colon. At the entrance of the ileum 
into the caecum it splits to become united again on the other side 
of the ileum, and to be continued to the apex of the caecum. The 
third band courses along the greater curvature of the ascending 
colon, and obliquely across the lateral surface of the caecum to its 
apex. All three bands end at the apex of the caecum. 
