1909.] OF MONKEYS OF THE GENUS PITHECIA. 941 



§ Limgs and Sjyleen. 



Finally, I have to recoixl that the right laug consisted of four 

 lobes and the left of two only ; and that the spleen was long and 

 narrow, '6\ inches in length b}' ^ inch greatest breadth. 



(2) Some Kotes upon Pithecia monachus. 



Since writing the above I have had the opportunity of dissect- 

 ing an example of Pithecia monachus, which died in the Society's 

 Gardens on Dec. 11th, 1909. It was a young male, and I have 

 therefoi-e been able to compare very particularly the structure of 

 the larynx with that of its congener. 



Generally speaking, I quite confirm the account of the anatomy 

 of this species by the late Sir William Flower to which I have 

 referred in my description of Pithecia 2iithecia. There are, how- 

 ever, certain details to which he has not referred, and I am able 

 to compare the two species in respect of these and of other points. 



The tongue appears to be almost exactly the same as in Pithecia 

 pithecia. The three circumvallate papillae are present, and, as in 

 P. pithecia, the fungiform papilla? are mainly upon the flat lip of 

 the tongue extending backwards along its sides, the middle 

 dorsal surface of the tongue being free from them. A prominent 

 fungiform papilla lies just in front of each lateral circumvallate 

 papilla. In P. jjithecia, as already noted, there is only this 

 fungiform papilla on one side. Mayer's organ is equally con- 

 spicuous and of about the same size in the two tongues. 



The palatal ridges difier slightly in the two monkeys, showing 

 at the same time a genei'al agreement. There are in both eight 

 ridges on each side of the palate of which the anterior series of 

 four ai^e more complete than the posterior series. 



I found that the proportions of the intestine in this young 

 male were rather diflterent from those described by Flower in a 

 young female*. In my specimen the small intestine was 

 42 inches, the colon and rectum 14 inches, and the cajcum 

 1| inch. In Flower's specimen the same measurements were 

 50 inches, 22 inches, and 4^ inches. 



I have figured on a pre\ ious page the interior of the csecum of 

 Pithecia pithecia. That of P. monachus is rather different, 

 except of course in essentials. The same valve separates the 

 CEecum from the colon, and the ilemn ojDens on to the colic side of 

 this raised fold. But in P. monachus there are none of the 

 complications shown in the colon {i. e. the series of deep depres- 

 sions) of P. pithecia. The internal surface of both colon and 

 cpecum is quite smooth and even. 



The omentum extends right down the abdominal cavity, and is 

 attached for the distance of barely an inch to the ascending and 



* The size of the two specimens appears to be about the same, i. e. 11 inches of 

 boclJ^ 



