OF THE TONGUES OF THE MAMMALIA. 285 



resembled the condition which I have already described and 

 figured for Macqcus (10). 



The outstanding features are, therefore, the great length of 

 some of the laminae of the lateral organs, and the sharp processes 

 on the f renal lamella. 



Sykes's Cercopitheque (C. albigidaris) has an entire, oval, un- 

 divided lamella (text-fig. 20 D). Owen (15) described a vallate 

 triangle. 



THE MONA GROUP. 

 Species examined : 1 . C. burnetii (two examples). 

 2. C. mona ( two examples). 

 I did not observe any pigmented forms in this group. 



Burnett's Cercopitheque (C. bumelti). 

 Habitat : "West Africa. 

 When the tongues were examined fresh they did not exhibit 

 the vessels running between the base and the vallate papilla?. 



Measurements. — Total length 3*2 cm. ; length of the oral part 

 2 - 5 cm. ; length of the pharyngeal part '7 cm. ; width between the 

 lingual attachments of the palato-glossal folds 1'5 cm. 



The apex and lateral borders are the same as in C. preitssi, and 

 the same structures are absent. 



The Circumvallate Papilla; (text-fig. 18 D). 



The vallate triangle has an acute or obtuse vertical angle. 

 It lodges many conical and a few fungiform papilla?. 



The three papilla?, especially the posterior one, are prominent, 

 and the latter appears as if it had been pushed through the 

 vallum, thereby stretching it. All are granular, the fossa? are 

 well-marked, and the Valiums look like clear zones. 



The Fungiform Papillae. 

 The fungiform papilla? are the same as in C. preussi, but are 

 more numerous at the sides. None are overlapped by conical 

 papilla?. 



The Conical Papillae. 



The arrangement is similar to that of G. preussi. Most of them 

 are cylindrical, and each one is surrounded by a zone of inter- 

 papillary dorsum (text-fig. 18 C). Their surfaces are granular, 

 and there are few points. 



A few orifices of ducts are present on the base of the tongue. 



The Lateral Organs (text-fig. 18 E, F, &■ G). 



The sulci are narrow, and the lamina? lie on both dorsum and 



lateral borders (L B.) All the sulci and lamina? are convex 



forwards, and secondary grooves traverse the latter. The right 



organ is # 65 cm. long, and has 6 lamina? and 7 sulci. The left 



20* 



