198 PON GO 



wards over the skull, drawing gradually nearer until they come 

 together at the occiput. The facial region is much more horizontal 

 than that of the other two, which, in them, has a considerable slope, 

 and the rostrum is shorter. The orbits are small and oval, but still of 

 a different shape from those of 183. The zygomatic width is less than 

 in the others, although they also differ, and this causes the face to 

 appear much narrower. Altogether No. 165 is so very different both 

 in its general appearance, as well as in particular parts, some of which 

 are mentioned above, that judging by the characters it presents as com- 

 pared with the other two, it might easily be regarded as a distinct 

 species, and yet all three came from the same district, or the same 

 place. 



Turning now to the two old adult male skulls of so-called gene- 

 paiensis, we are at first impressed by their total dissimilarity. Both 

 are old males, but one, 151, is half as large again as the other, with the 

 braincase lifted high up, and not so much slope to the facial region. 

 It is altogether a more massive and heavier skull, and larger in all 

 its parts. Both have bony crests, but that of 151 is broader and rises 

 higher at the occiput. The superior outline of the braincase is nearly 

 straight, while that of the smaller skull. No. 42, curves downwards at 

 the occiput. In their general aspect these crania resemble those of 

 P. dadappensis, varying in different particulars, as all Ourang skulls 

 do from each other, but the two from Genepai differ from each other 

 much more, in many ways, than they do from those from Dadap, and 

 there are no characters exhibited by them which would help to assert 

 a claim for separation, and in view of the proximity of the localities 

 from which they came, and which would seem to negative the existence 

 of distinct species, the proper course appears to be to regard them as 

 the same. 



The following dimensions are from a skull of the Skalau District : 

 Measurements. Skull. Adult Male. No. 200 Selenka Collection, 

 Munich Museum. Total length, 248 ; occipito-nasal length, 149 ; inter- 

 temporal width, 64; breadth of braincase, 91 ; Hensel, 163: zygomatic 

 width, LS8; extreme width of orbits, 104.1; width of rostrum at 

 canines, 65 ; palatal length, 83.5 ; length of upper canines, 28.7 ; length 

 of upper molar series, 54.9; length of mandible, 158; length of lower 

 molar series, 67. 



The skull, the measurement of which is given above, is a fair 

 average size of an old male Ourang. It has a low crest from the 



