OF THE TONGUES OF THE MAMMALIA. 501 



simple (c). The vallate area is crowded with conical papillae, and 

 a fungiform papilla bisects the base. 



The Fungiform Papillce have a similar arrangement to those of 

 C. fatiiellus, and exhibit the same characters. 



The Conical Fcqnlloi have no definite arrangement in clusters 

 and rows, but they increase in size in the usual manner. None 

 overlap the vallate and fungiform papillse. 



Lymphoid Tissue and Glands. — The base of the tongue is 

 covered Avith nodules, but no duct orifices are visible through the 

 lens. They are intermingled with conical papillae. 



The Lateral Organs lie on the dorsum and lateral borders of 

 the tongue, and are curved with the convexities forwards. Their 

 surfaces are smooth, and some are traversed by secondary sulci. 

 The inner ends of the laminae are pointed. Both organs have 

 nine laminae and ten sulci. 



The Lnferior Surface. — The ventral 2^(!''pillO''>"y border is narrow 

 round the apex, and widens on the edges of the inferior surface. 



Text-figure 40. 

 -^"^ 0°°°° 



C. 6. 



The vallate papillae of Cebus alhifrons. 



Its fungiform papillae are arranged in two rows as in C.fatuellus^ 

 The ventral mesial sidcus is short, narrow, and deep. It opens 

 posteriorly into a triangular fossa, which also i-eceives the frenum. 

 The frenal lamella is triangular, with a bifid apex and serrated 

 edges which extend postero-laterally as far as the middle of the 

 lateral organs. 



The Weeper Capuchin (C. capucinus). 



Several authors have described the tongue of C capucijizis, and 

 the following arrangements of the vallate papillte have been 

 recorded : — 



(1) Three papillae in a triangle Mayer (4). 



(2) Four papillae as a double-pair Mayer (4). 



(3) Three papillae in a triangle Flower (3). 



(4) Three papillae in a triangle (in 5 cases) ... Miinch (5). 



The White-throated Capuchin (C. hypoleucos). 



Tuckerman (9) described the macroscopic and microscopic 

 appearances, and recorded three papilla? in the form of a triangle. 



