298 DU. C. F. SONNTAG ON THE ANATOMY 



The Mozambique Cercopitheque (G. rufoviridis). 

 Habitat : Mozambique. 



The tongue, which is widest between the anterior limits of the 

 lateral organs, has the following measurements : — Total length 

 4 - 6 cm.; length of the oral part 3 - 8 cm.; length of the pharyngeal 

 part - 8 cm. ; greatest width 1*8 cm. These figures refer to the 

 larger of two specimens. 



The apex and lateral borders are similar to those of G. sabceus 

 and G. tantalus. 



The Circumvallate Papilla?. 

 There are two pairs of vallate papillae — anterior and posterior — 

 and the posterior elements are close together. All are circular, 

 prominent and granular, the fossae are well-marked, but the 

 Valiums are not easily distinguishable from the surrounding 

 dorsum. In my second specimen small papillae lie between the 

 four large ones of the double pair. 



The Fungiform Papilla}. 



Fungiform papillse are absent from the centre of the dorsum, so 

 they form a papillary bounding zone. The apical cluster is large, 

 and the oblique posterior rows are close together. The former 

 set contains large papillae. On the inferior surface the apical 

 papillae form a prominent cluster, but there is a single row of 

 papillae posteriorly. 



All are hemispherical, smooth and polished, and none are over- 

 lapped by conical papillae. 



The Conical Papillae. 

 The papillae have the typical arrangement in rows and clusters. 

 Most of them have cylindrical bodies surrounded by a zone of 

 interpapillary dorsum, and they give the tongue a sago-grain 

 appearance. 



The Lateral Organs. 



Deep sulci separate short, flat laminae. The right organ is 

 1 cm. long, and has 7 laminae and 8 sulci. The left organ is 

 1*2 cm. long, and has 5 laminae and 6 sulci. 



A few orifices of gland ducts and pits ace present on the base of 

 the tongue. 



The Frenal Lamella. 

 The triangular lamella has a bifid apex, and its smooth edges 

 extend back to the anterior limits of the lateral organs. 

 The median ventral stdcus is shallow and triangular. 



The Vervet Oercopitheque (G. pygerythrus or lalandii) has a 

 long, narrow, bifid lamella (text-fig. 20 F). 



