198 PONGO 
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, 158; 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 
