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, ; 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. 7; 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 in., of femur 6 in., of ti- 

 bia 5 \ in. 



The spleen, in both species, was similar in shape (Fig. 5,) but in 

 C. sabasus rather larger than in C. fuliginosus. 



From the above account it will be seen that the stomach is larger 

 in C. sabeeus than in C. fuliginosus, the contrary being the case 

 with regard to the Cceca.* 



* 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. 



