296 DR. C. F. SONNTAG ON THE ANATOMY 



The Tantalus Cercopitheque (G. tantalus). 

 Habitat : Nigeria. 



Measurements.- — Total length 4 - 6 cm. ; length of the oral part 

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

 lingual attachments of the palato- glossal folds 2 cm. 



The apex and lateral borders are the same as in 0. sabceus, and 

 there is no median dorsal sulcus. 



The Gircumvallate Papillce. 



Four vallate papillae are arranged in the two-pair type, but the 

 elements of the posterior pair are more widely separated than in 

 G. sabaius. The left papilla? are oval and all the others are 

 circular on plan. In some specimens both posterior papillae are 

 circular (text-fig. 24 K). 



The Valiums of the anterior pair are clear zones, or have the 

 appearance of nodulated and granular bands (text-fig. 24 0), and 

 those of the posterior papillae are raised, as in G. sabceus (text- 

 fig. 24 D), but are not so thickly crowded with conical papillae. 

 All the papillae project beyond the Valiums, and they are conical 

 on elevation, with the broad ends free (text-fig. 24 L). 



The Ftcngiform Papillce (text-fig. 24 E). 



The fungiform papillae are placed on a zone round the anterior 

 two-thirds of the dorsum, and they are arranged thereon in the 

 typical manner. On the lateral borders they form a row of 

 prominent bodies. They have, therefore, the same appearances 

 as in C. sabceus. 



They are hemispherical, cylindrical or lobulated, and their 

 surfaces are smooth or granular. 



The Conical Papillce (text-fig. 24 F & G). 

 The conical papillae have the usual arrangement, the common 

 distribution according to size, and the typical mode of direction 

 of the points. Through the lens they appear very similar to those 

 of 0. sabceus, but the additional forms are shown in text-fig. 

 24 F & G. Between the different rows the strips of inter- 

 papillary dorsum are visible. 



Lymphoid Follicles. 

 Several lymphoid follicles and duct orifices can be seen on the 

 base of the tongue. 



The Lettered Organs (text-fig. 24 H). 

 The lateral organs resemble those of G. preussi. They consist 

 of a series of laminae and sulci running from behind forwards 

 and inwards, and each of the former is traversed by a secondary 

 sulcus. The whole organ diminishes in size from before back- 

 wards. Behind them are folds of the mucosa. The laminae do 



