1902 - 3 .] Abdominal Viscera of Cercocebus fuliginosus, etc. 535 
the food governs the intestinal length, and with a desire to show 
that the weight of the body is of primary importance in this 
connection. And certainly his tables show that, as the weight of 
the body increases, the “ coefficient ” diminishes, independently of 
the kind of animal. But still more recently (at the beginning of 
the present year) Lapicque (32) has pointed out objections to 
Noe’s method, and shown that the older practice is more satis- 
factory. Therefore the classic plan will be followed here. 
In Cercocebus the measurements of the intestine are as 
follows : — 
Duodenum 
= 
90 
mm, 
Jejunum and Ileum 
= 
2860 
5 J 
Caecum . 
= 
50 
Colon . 
= 
850 
* Rectum 
= 
110 
3960 mm. 
The length of the body, measured in a straight line from the- 
vertex of the head to the root of the tail, = 600 mm. 
600 : 3960 : : 1 : 6*6 
That is, the length of the intestine is 6*6 times the length of 
the body. 
In Lagothrix the length of the intestine is : — 
Duodenum 
= 
120 
mm. 
Jejunum and Ileum 
= 
1820 
5? 
Caecum . 
= 
120 
Colon . 
= 
410 
)) 
* Rectum 
= 
65 
2535 mm. 
The length of the body, measured as in Cercocebus , is 500 mm. 
500 : 2535 : : 1 : 5*07 
The length of the intestine is, therefore, about five times the 
length of the body. 
* The length of the rectum was obtained by measuring, with calipers, the 
distance from the pelvic inlet to the anus. This was done because it was 
desired to leave the pelvic viscera undisturbed. There seems little reason to 
doubt that this method gives results sufficiently accurate for the present 
purposes of comparison. In both Lagothrix and Cercocebus the rectum, so 
far as can be seen, runs straight between the two points from! which the 
measurements were taken. 
