OF THE TONGUES OF THE MAMMALIA. 285 



resembled the condition which I have ah-eady described and 

 figured for Macacus (10). 



The outstanding features are, therefore, the great lengtli of 

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

 on the frenal lamella. 



Sykes's Cercopitheque {C. albiriularis) has an entire, oval, un- 

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

 triangle. 



THE MONA GEOUP. 

 Species examined : 1 . (7. hurnetti (two examples). 

 2. C. mona ( two examples). 

 I did not observe any pigmented forms in this group. 



Burnett's Cercopitheque (6'. hurnetti). 

 Habitat : West Africa. 

 When the tongues were examined fresh they did not exhibit 

 the vessels running between the base and the vallate papillae. 



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 preussi, and 

 the same structures are absent. 



The Cirnumvallate Papillce (te:s.t-Gg. 18 D). 



The vallate triangle has an acute or obtuse vertical angle. 

 It lodges many conical and a few fungiform papillae. 



The three papillae, 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 foss?e are 

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



I'he Fungiform Papillce. 

 The fungiform papillae are the same as in C. 2yreicssi, but nre 

 more numerous at the sides. None are overlapped by conical 

 papillae. 



The Conical Papillce. 



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

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

 papdlary 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, k, G). 



The sulci are nari'ow, and the lamina3 lie on Ijoth dorsum and 



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



forwards, and secondary grooves traverse the latter. The right 



organ is "65 cm. long, and has 6 laminae and 7 sulci. The left 



. 20* 



