12 



bably nine or ten years of age at the time of her death. Of her 

 agility and her cry I shall say nothing; much has already been 

 written on these subjects, and no account of mine could give any 

 adequate impression of her ■vv'onderful manners. 



This individual is the one which was exhibited in London in 1840, 

 and of which mention is made in Martin's ' Natūrai History of Qua- 

 drupeds,' Part 8. 



Section I. — Of the Skull. 



The cranium of the Hylohates agilis if? elongate and ovate in form, 

 much-contracted behind the orbits, \vhich are very projecting and 

 deep and surmounted by very elevated supraciliary ridges. The 

 muzzle is rounded and broad, so that the face, although considerably 

 prominent, has not attained the lengthened shape of the Baboons or 

 of the adult Orang Utan. The forehead, which is narrow, is but 

 slightly arched above the orbits, so that the whole of the cranium is 

 behind the face. 



A slightly elevated ridge of bone, arising from the supraorbital 

 ridges, which becomes contracted during its passage over the coronal 

 aspect of the skull, and again expands towards the occiput, marks 

 the boundary on either side of the temporal museles. This elevated 

 medial portion is smooth, w'hilst the latei-al portions of the skull are 

 roughened by muscular attachments. This development is similar 

 to that of the Chimpanzee, \vhilst in the Orang Utan the sagittal 

 ' and temporal crests are elevated to an extraordinary extent. 



The supraorbital ridges, we have before remarked, are much-de- 

 veloped. Such is the case in the Chimpanzee, where hovvever they 

 form a junction across the face, which does not take place in the 

 Active Gibbon. The orbits have a very prominent margiu, are very 

 large and deep, and are much swelled out externally, so that their 

 outer portion " projects very boldly from the cranium." Sir Thomas 

 Stamford llaffles says of tlae Siamang, " The orbits of the eyes are 

 circular and remarkably prominent," Linn. Trans. vol. xiii. p. 242. 

 Such too is the character of the skull of the adult Hoolock figured 

 by Dr. Harlan in the Transactions of the American Philosophical 

 Society, vol. iv. New Series, p. 52. 



The nasal bones make a slight elevation, thus resembling Man 

 more than the Orang Utan or even the Chimpanzee. The osseous 

 opening of the nose is wide and rather large. The figure of the face 

 ^■iewed in front, from between the orbits to the dental edge, resem- 

 bles a wedge -vvhose point is directed downwards. This form is con- 

 trary to that of the Baboons, ^vhere the vredge is inverted. The 

 infraorbital canal opens by a single hole, as in Man and the Chim- 

 panzee. This foramen is smaller in the Gibbon than in those animals. 



The outvvard curvature of the zygomatic arch is not great ; it is 

 placed far more posteriorly than in Man, in consequence of the 

 lengthening of the facial portion of the skull. 



The skull of this Gibbon is anchylosed, externally at least, into 

 one piece. Prof. Owen tells us that the cranial suturės are oblite- 

 rated in the adult Orang Utan, Syndactylous Ape, and freąuently 



