1902-3.] Abdominal Viscera of Cercocebus fuliginosus, etc . 523 
regard to position ; the left being much nearer the pelvis than the 
right. Perhaps this dissimilarity may be best denoted by saying 
that the caudal extremity of the right lies 45 mm. nearer the head 
than the corresponding end of the left (fig. 3). The dimensions of 
Siqbr. 
JLsf L 
Fig. 3. 
the two organs are also different, as is shown in the following 
table : — 
Right kidney. Left kidney. 
Length . . 60 mm. 58 mm. 
Breadth . • 37 „ 40 „ 
Thickness . . 27 ,, 25 „ 
The left kidney has a flattened dorsal surface, its convexity 
being only very slight. Its ventral surface is very convex, 
especially along a line beginning close to the cephalic extremity 
and running along the surface about its middle to terminate some 
little distance from the caudal end. The result of the presence of 
