ANTHROPOID APES. 



437 



1904.] 



Pithecus sumatranus deliensis bestowed upon it by Dr. Selenka, 

 while he called the phase without the callosities P. sumatranus 

 ohangensis. Unfortunately, however, both these forms had had 

 previous names given to them, viz. Sim.ia ahelii by Clarke and 



Text-fio-. 116. 



Skull of Ponffo 231/ffiH'^us forma acjrias (Sclireber). 



Simia hicolor by Isidore Geoffroy respectively ; therefore the fourth 

 and Sumatran subspecies of Pongo pygmceus stands as follows : — § 



Pongo pygmceus j form, dimorph. ahelii (with cheek- callosities). 

 hicolor, [ form, dimorph. 6^coZo?■ (without cheek- callosities). 



After these explanations, I think the following synoptical table 

 of the divisions and subdivisions of the Orang-Outan, Pongo 



