two Species of Cercocebus.. 
439 
of the rectum in this species present rather a sacculated appear- 
ance (Fig. 3.) 
Upper jaw, molars, 8; incisives, 2 anterior ; canines, 0; milk or 
first teeth, 2. Lower jaw, molars, 6 ; incisives, 2 anterior ; ca- 
nines, ; milk or first teeth, 4. In the upper and lower jaw the 
young canines were displacing the two milk teeth adjoining the an- 
terior incisives, the posterior molars were just beginning to appear. 
Vertebrae, cer. 7j dor. 11 ; lum. 7; sac. 3; caud. 23, probably 
the last caudal vertebra was wanting Ribs, 9 true, 3 false 
Length of the ulna 5 in., of humerus 4 T 2 u in., of femur 6 in., of ti- 
bia 5 in. 
The spleen, in both species, was similar in shape (Fig. 5,) but in 
C. sabeeus rather larger than in C. fuliginosus. 
From the above account it will be seen that the stomach is larger 
in C. sabseus than in C. fuliginosus, the contrary being the case 
with regard to the Coeca.* 
* It will be useful to compare the figures illustrating this paper with those 
given in the Transactions of the Zool. Society, i. p. 65, plates 8 and 9 of the 
sacculated stomachs of the Semnopitheci. EDIT. 
