18 



DR. C. F, SONNTAG ON THE ANATOMY 



conical papillpe occupy the spaces between its lateral borders and 

 the edges of the tongue. 



The Orang-Outan is the only other Anthropoid which has a 

 bare area (text fig. 4 A), but it is Y-shaped and smaller in size. 



The Circumvallate Pcqnllce. 

 Five vallate papillae axe arranged in the form of a Y ; of these, 

 three form a mesial row, and there is a right lateral and a left 

 lateral papilla. All the papillae are circular on plan and conical 

 on elevation, and the fossae are well-marked. But the Valiums 

 are not demarcated off from the smooth area on which the 

 papillae stand. All have smooth bodies, and the right and left 

 lateral ones are umbilicated. 



Text-figure 5. 



The tongue of Symphatangus syndactylus, showing the dorsum, inferior 

 surface, and right hiteral organ with lateral vallate papilla. 



The Fungiform Fapillce. 

 The fungiform papillae are present over the anterior two-tliirds ' 

 of the dorsum except for a zone along the mid-line. They have 

 the usual distribution in clusters and rows, and are never very 

 large nor concealed by conical papillae. On the lateral borders 

 and inferior surface the}' are arranged in lines running vertically 

 or from without inwards. 



The Conical Papillce. 

 They have the usual form of distribution in clusters and ridges, 

 and their characters are visible to the naked eye right forward 

 to the apex. Most of them are filiform with the points directed 

 backwards, or backwards and inwards. 



