CHAP. IV] THE GENERAL ANATOMY OF THE CERCOPITHECIDAE 151 



arrangement in an evolutionary sequence), is worthy of much 

 consideration 1 . 



Some distinctive features of the liver may now be enumerated. 

 Thus (a) the incisura duodenalis is filled up and obliterated ; 

 (b') the left lateral lobe is withdrawn from the right side of the 

 abdomen, and with its decrease, the preponderance of the right 



Vena cava 

 inferior 



Right 

 lobe 



Quadrate 



lobe 



Gall 



bladder 



Caudate 

 lobe 



Intestine 



Cardiac end 

 of stomach 



Left lobe 

 of liver 



Stomach 



Pancreas 



Spleen 



Fig. 95. Liver, Stomach, Pancreas and Spleen of a Cereopithecus monkey. 



side of the liver is seen to begin; (c) the true lobus caudatus 

 is no longer falciform ; it is almost wholly ventral to the post- 

 caval vein, the leftward position (seen in Lemurs) having been 



1 Ruge has pointed out that this is true for the apparent shortening of the trunk 

 (cf. Morph. Jahrb. Bd. xix. S. 249). The same writer (Morph. Jahrb. Bd. 35) 

 remarks on the recurring evidence of the lowly position of the genus Cercopithecus, 

 adding that they are separated from the Cynocephali and others of the Cercopithecidae 

 by a wide interval not bridged by any living genus. These remarks are based on 

 the study of the liver. 



