PONGO 187 
the former owner of any skull should be placed. Instead of indicating 
a distinct race, or being dimorphic, of which there is at present no 
proof whatever, I am inclined to regard the callosities as an individual 
characteristic of some old adult males varying greatly in extent, but 
not always present ; and I see no reason whatever to give them separate 
names on account of the presence or absence of these growths, as 
has been done, or to recognize them in any way as representing separate 
forms. 
I have seen no specimens of a small adult Ourang from Borneo, 
which could be regarded as representing a distinct species such as is 
indicated in the Pithecus morio Owen. There may be a dwarf Ourang, 
as there is a dwarf gorilla-like Ape, but at present it is not represented 
in any Museum so far as I am aware. 
Wallace mentions a specimen killed by him as having been de- 
posited in the British Museum, but I did not see it. It was, he said, 
about “one-tenth smaller in all its dimensions than the other adult 
males, and had no sign of the lateral protuberance on the face.” 
These can hardly be considered sufficient ‘differences’ upon which to 
base a distinct species, and would not be likely in a series of skins to 
attract attention, and the differences mentioned by Prof. Owen are 
such as may be easily found in the variable crania of Ourangs. 
Of P. s. wallacei (1. c.), Herr Selenka had no especial knowledge, 
but applied the name to the form from Sarawak, which would make 
it a synonym of his P. s. landakensis. Of the Sumatra Ourangs Herr 
Selenka gives names to two, deliensis which becomes a synonym of S. 
abelu Clark, (if this latter is distinct from the Bornean Ourang) ; 
and obogensis, which is a nomen nudum, as he gives no description 
having never seen a specimen, his only knowledge of the animal having 
been derived from the accounts told him by the natives. The animal, 
however, would probably be the same as S. bicolor I. Geoffroy, of 
which obogensis would be a synonym. 
In a collection of 50 Ourang skins received at the Munich Acad- 
emy from one locality, as I understand, in Borneo, the majority of 
which, as is always the case, were immature individuals, there was 
but one male that had cheek callosities, which would certainly be a 
rather extraordinary fact, if these growths did not represent merely 
an individual peculiarity to which no specific value could be attached. 
The question now arises, what is the proper name for the Bornean 
Ourang-utan? 
The name S1m1A pyGM£us was first published in the “Amcenitates 
Academice” (1. c.) 1763, VI, p. 69, by Christianus Emmanuel Hoppius 
