152 THE GENERAL ANATOMY OF THE CERCOPITHECTDAE [SECT. A 



abandoned ; (d') the right lateral lobe has reduced its contact- 

 area on the lateral aspect of the right kidney ; (e) a prominence 

 of the left lobe called "processus triangularis" now appears; it is 

 lost again in Man, or is represented only by the tuber omentale, 

 save in anomalous instances. 



The pancreas and spleen have relations similar to those seen 

 in Man. But the spleen of Cercopithecus (if the stomach be not 

 distended) may come into contact with the liver owing to the per- 

 sistently large size of the left lobe of the latter organ. 



Genitourinary System. In a young specimen of a Cepha- 

 lopterus monkey (Cercopithecidae) the right kidney is situated 

 posteriorly (i.e. caudally) to the left ; the right suprarenal body is 

 elongated and nearly cylindrical, the left being pyramidal in form. 

 The anterior renal surface is much more convex than the posterior 

 surface. Into the renal pelvis a single pyramid bulges distinctly, 

 though there are indications that a series of sections might reveal 

 more than one such protrusion. The genitalia are considered in 

 the two sexes separately. 



A. The male. The testes in the foregoing example are still 

 situated in the inguinal canal, though close to the " external 

 ring " ; it will be noted that the specimen though admittedly 

 young, nevertheless having acquired the first permanent teeth, 

 corresponds in age to human children of six to seven years. 



The penis is protected by an elongated prepuce attached 

 far behind the glans, a fraenum praeputii being entirely absent. 

 The long penile urethra is supported by the cartilaginous "os" 

 penis, and terminates posteriorly in a distinct bulb, the latter 

 being well protected by the concrescence of the two ischial cal- 

 losities in the middle line of the perinaeum. The prostate gland 

 is large, unilobular, and firmly attached to the rectum as well as 

 to the urethra and base of the bladder. 



The membranous urethra contains a distinct spheroidal caput 

 gallinaginis with lateral depressions. 



The abdominal peritoneum is reflected almost horizontally 

 forward from the fundus of the distended bladder. 



B. The female. The genitalia of a young female Cynocephalus 

 mormon provide material for the following notes. Externally, the 



