1855.] Remarhs on the different species of Orang-utan. 521 



corresponding bones of the full grown male Kassar in length ; being 

 very much shorter than those of the adult Rambi and Pappan : and 

 this remarkable brevity of limb, combined with the conspicuous 

 differences in the skull and sundry other distinctions, can scarcely 

 be considered otherwise than as indicative of specifical peculiarity. 



Of the five Rambis sent, there is unfortunately no specimen of a 

 male of the largest size, comparable to that of which the skull is 

 figured in the 1st and 2nd plates accompanying my former memoir : 

 but there are two large full-grown females (including that ticketed 

 Mias Chapin), and also a full grown female of smaller dimensions 

 (which was labelled If. Pappan ;) with a male of superior age and 

 stature to the male Pappan presented formerly by Mr. Mcholls ; 

 and also a young male, with the last molars brought into wear, but 

 which nevertheless had not nearly attained its full growth, which 

 bade fair to rival that of the gigantic Sumatran male already noticed. 



The specimen to which the name Mias Chapin was attached, 

 appears (as already mentioned) to be a large old female Rambi, very 

 remarkable for the enormous size and vertically elongated form of 

 its orbital cavities, which measure 2 in. by nearly If in. across. Its 

 skull is larger, though less massive, than that of the female Rambi 

 figured in my former memoir : the muzzle is conspicuously more 

 slender, measuring but 2J- in. in greatest width (outside the canines), 

 instead of 2-f- in. : and whereas the coronoid process of the lower 

 jaw in the former specimen is smaller and about on a level with the 

 condyle, in the present example (labelled Chapin) the posterior or 

 condyle process is unusually prolonged, and raises the skull (with 

 lower jaw in situ) so remarkably, that placing it on a level surface 

 together with the other skull noticed, the zygoma of the so-called 

 Chapin not only overlaps that of the other, but its lower edge is 

 about -fa in. higher than the upper edge of the zygoma of the other 

 specimen :* the nasal bones, which in the other are united and 

 ascend to the very summit of the glabella, in this skull continue 

 separate, and reach only to the lower portion of the glabella. This 

 skeleton is very deficient, wanting the sacrum and most of the bones 

 of the hands and feet : but all of the long bones are present, with 



* In Prof. Owen's figure of a female Rambi skull (ZooL Trans. I, pi. 35), the 

 condyle-process is similarly elongated. 



