28 JDR. C. p. SONNTAG ON THE ANATOMY 



surface of the tongue and from its under surface to the floor of 

 the mouth. 



The ventral mesial sulcus begins anteriorly at the posterior 

 border of the papillary zone. It is narrow and deep, and lodges 

 a small median crest. 



Text-fiofure 9. 



10. II. IB. 13. 



o ® 



PapillitB of the Gibbons. 

 1-13, conical papillae; 14-16, fungiform papillre ; 19, vallate papillae of H. Jioolock. 



Summary AND Conclusions. 



1. Apical notches and mesial dorsal sulci are more frequently 

 absent than present, and are of no particular value for compara- 

 tive purposes, 



2. The lateral borders have the same chai^acters as regards 

 papillse in all forms. In the Chimpanzee and Gibbons they lolge 

 the greater part of the lateral organs, but in the Gorilla and 

 Orang they only lodge a small part. 



3. The vallate papillse are usually, fewer than in Man (7-12). 

 In the Orang they are in V-formation, but they usually assume 

 the Y-type in others. Compound papillse are common. 



4. Filiform papillse are the predominating type of the conical 

 group. on the anterior two-thirds of the dorsum. 



5. The long conical papillte on the base are largest in the 

 Gorilla, smaller in the Chimpanzee, smallest in the Gibbons, and 

 absent in the Orang. 



6. Only the Orang and Siamang have smooth non-papillnry 

 areas on the base. 



7. Plicse fimbriatse are absent in the Gibbons. 



8. Median ventral crests occur in the Gorilla and some 

 Gibbons. 



9. The Orang and Siamang have no triangular sublingual fold, 

 but all the other Simise possess one. ' In the Gorilla the apex is 

 entire,, but in all the rest it is bifid. 



