OF THE TONGUES OF THE MAMMALIA. 



279 



The Circumvallate Papillae (text- fig. 16 D)« 



Three prominent, circular, vallate papillae form an isosceles 

 triangle whose acute vertical angle is directed backwards. All 

 are bluish-black in colour, granular, and have white secondary 

 papillae at their anterior poles. All the fossae (text-fig. 16 D, e) 

 and Valiums are well-marked, and the posterior vallum is coarsely 

 nodulated (text-fig. 16 D, b and c). 



The vallate triangle contains several large conical papilla?, and 

 a large fungiform papilla bisects the base. 



Text-figure 16. 



The tongue of Presbytes cephalopterus. 



A. Dorsum; B. Inferior surface; C. Lateral organs ; D. and E. Plan and elevation 

 of the posterior vallate papilla (or. anterior part ; d. main part). Other letters 

 in the text. 



The Fungiform Papillae. 

 The fungiform papillae form a dorsal bounding zone on which 

 they have the usual arrangement in clusters and rows, but they 

 have not got the usual distribution according to size. The 



