OF THE TONGUES OF THE MAMMALIA. 311 



The Frenal Lamella. 



The apex is bifid, and the edges, which are tuberculated 

 posteriorly, extend as far as the middle of the lateral organs. 



The ventral papillary zone is widest in front. It has a single 

 toav of fungiform papillae. 



The structures mentioned on page 278 are absent. 



Munch (8) has shown that the tongue of the Sooty Mangabey 

 (G.fuliginosus) has a vallate triangle. 



The White-crowned Mangabey (C. lunulatus). 

 Habitat : West Africa. 



Measicrements. — Total length 5 cm.; length of the oral part 

 4*4 cm. ; length of the pharyngeal part *6 cm. ; width between 

 the lingual attachments of the palato-glossal folds 2'3 cm. 



The apex is flat and devoid of a notch. It is very closely 

 studded with small fungiform papillae. The lateral borders are 

 more rounded than in G. aithiopicus, but their fungiform papillae 

 are more numerous, smaller, and arranged in more than one row. 



The usual structures are absent (see page 278). 



Text-figure 33. 

 ® 



t j.|il.i«W////»vu 



A. B 



The vallate papilla? (A) and lateral organs (B) of Cercocehus lunulatus. 



The Gircumvallate Papillee (text-fig. 33 A). 

 Three papillae form an isosceles triangle with an acute apex, 

 but they are not so large nor prominent as in C. cethiopicus. 

 Moreover, they are not throWn into prominence by the contrast 

 between their white colour and pigment of the dorsum, for 

 the tongue is devoid of colour. All are circular and vary in 

 protrusion or retraction, the fossae are clearly-cut, but the Valiums 

 are not prominent. 



The Fungiform Pajnllce. 



The character and distribution are the same as in C. wthiopicus, 

 but the papillae are smaller and more numerous. 



All the papillae are hemispherical, and their surfaces are 

 smooth or granular. 



The Conical Papillai. 

 Their arrangement and distribution according to size follow the 

 usual plan. 



The papillary bodies are cylindrical, irregular or tapering, and 



