OF THE TONGUES OF THE MAMMALIA. 



237 



The Mona Oercopitheque (C. mono). 

 Habitat : West Africa. 



The fresh tongues did not reveal the vessels running between 

 the base and the vallate area. 



The following measurements refer to an adult specimen : — 

 Total length 3*5 cm.: length of the oral part 2*9 cm.; length of 

 the pharyngeal part # 6 cm. ; width between the lingual attach- 

 ments of the palato-glossal folds 1'9 cm. 



One of my specimens (adult) has an apical notch whence a 

 median sulcus runs back for 1-05 cm., but the young specimen 

 has neither. In other respects, however, the apex and lateral 

 borders have the same characters, and the lateral parts of the 

 dorsum have the same clusters of fungiform papilla? as in 

 C. burnetii. 



Text-fio-ure 19. 



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9876 5 4 3 2 1 



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The tongue of Cercopithecus mono. 



The Circumvallate Papilla! (text-fig. 19 C, D, & E). 



The vallate triangle is isosceles. The three papillae, especially 

 the posterior one, are prominent as in G. burnetii. One tongue 

 has a finely-granular posterior vallum, but the latter is coarsely 

 nodular in my other specimen (text-fig. 19 D). Within the 

 vallate area there are more fungiform papillae than in C. burnetii. 

 The anterior papilla? are oval, but the posterior one is circular, 



Munch (8) described a vallate triangle. 



