OF THE TONGUES OF THE MAMMALIA. 299 



THE DIANA GROUP. 



Tuckerman (11) has described the tongue of 0. diana and 

 pointed out that it has a vallate triangle. He states that it has 

 no frenal lamella, but doss not explain whether the tongue was 

 carefully removed. The lamella is easily cut away unless great 

 care is taken in removing the tongue. 



THE PETAUEISTA GEOTJP. 



Miinch (8) has pointed out that the tongue of O. petaurista has a 

 triangular vallate area. 



Mr. Pocock's sketch of the tongue of Schmidt's Cercopitheque 

 (C. schmidti) has a conical, or oval, undivided frenal lamella 

 (text-fig. 20 E). 



Summary of the Tongues of the Species of Cercopithecus. 



1. The tongues are conical or spatulate. 



2. Apical notches and median dorsal sulci are variable, 



3. The foramen caecum, lytta, and Apical Gland of Blandin 



are absent. 



4. Plicae fimbriate are absent in the adult, but may be present 



in the young animal, as Deniker described in the Gorilla 

 and Gibbons. 



5. The lateral organs appear as flat laminae and sulci, or as 



rows of oval bodies. 



6. The vallate papillae form a V, T, triangle or double-pair 



arrangement, and it must be stated that the type described 

 in each species is the commonest in a large series of 

 examples which were examined by me or recorded by 

 . others. 



7. The frenal lamella has an entire or bifid apex. 



8. Fungiform papillae form a dorsal bounding zone or stretch 



across the whole dorsum. 



9. It is not possible to group the Oercopitheques by the nature 



of the tongues as one can b}^ their external characters, 

 and I have arranged them in their zoological series to 

 show this. Most of the species in the iEfchiops Group 

 have a double-pair of vallate papillae, but others have the 

 triangular type, and that is as far as one can go. 

 10. Some examples of 0. jjatas and C. tantalus are pigmented. 



Genus Macacus. 



The Rhesus Macaque (M. rhesus). 



Habitat : India. 



Tuckerman (11) has briefly described the tongue, and most of 

 his account deals with the gustatory papillae. He has described 

 Proc. Zool. Soc— 1921, No. XXI. 21 



