474 Dr. Harwood on a Pair of hinder Hands 



observation. 'I'here is a considerable dift'erence in the clavicles, 

 in the Pongo they are much straighter and of a different form, 

 as was particularly observable in a specimen belonging to that 

 kind and munificent promoter of natural science, the late Sir 

 Stamford Rattles. 'J'he scapula? of the Pongo have their spine 

 stronoly incurvated upwards, while in the Simia Satijrns it pur- 

 sues almost a straight direction horizontally : the space also for 

 the attachment of the infra spinatus muscle is, relatively to the 

 size of the bone, far more extended in the Pongo. In regard to 

 the form of the skull, there are differences between these animals 

 so decided as particularly to claim our attention, especially as I 

 am not aware that they have been before noticed. The nasal 

 bones in both animals are perfectly tiat and do not at all project 

 forwards, and are ossified together at a very early age ; but the 

 antrum is a cavity of far greater dimensions and developement 

 in the Satijrus than in the Pongo, where it can be hardly said to 

 exist at all, — a circumstance which, supposing the latter to be 

 the adult Sati/rus, is the reverse of what takes place in other 

 animals. But the most distinguishing difference relates to the 

 proportions of the orbits, and the space which separates them. 

 They are of by far the greatest proportionate size in the Saiijrns; 

 for in the very young animal before alluded to, they measure 

 transversely 1.5 lines and a half, while in the skull of the largest 

 Pongo ever brought to this country, they extend no more than 

 17 lines and a half. But the difference in the extent of the space 

 between the orbits is of all the distinctions I have seen the most 

 apparent ; for in the Sati/riis, where the transverse extent of the 

 orbits is 15 lines and a half, and the vertical 17 and a half, the 

 space between the orbits is only 2 lines and a half; and in the 

 still younger Satyr us at the Royal Institution, where the trans- 

 verse diameter is 13 lines and a half, this space measures only 

 2 lines, or less than one-sixth : while in the Pongo, where the 



same 



