22 ON THE ANATOMY OF THE 



not seem capable of perfect extension of this joint 

 from the contraction of the posterior muscles of the 

 limb. The tarsus possesses much more freedom of 

 motion than in man. The ankle may be bent, so 

 as to form a very acute angle with the tibia ; — a 

 circumstance favourable to the prone posture of the 

 animal in walking; and it may be turned verj 

 freely inwards and outwards. 



The Muscles, 



In examining the muscles of this animal, are 

 found several which seem to have escaped the re- 

 searches of Tyson, as well as the more recent obser- 

 vation of Camper and of Cuvier. How far this 

 may be owing to peculiarities in our specimen, I 

 shall not presume to determine ; but shall be con- 

 tented to mark such discrepancies as may be be- 

 tween what occurred during our dissection of the 

 Orang Outang, and the descriptions of preced- 

 ing anatomists ; commencing with 



The Muscles seen on the Front of the Head, 

 Neck and Trunk. — We found no trace of an oc- 

 cipito-frontalis muscle ; a remark also made by Dr 

 Tyson. The orbiculares and recti palpebrarum, as 

 well as the muscles about the nose, the most of the 

 muscles of the lips, with part of the buccinator and 

 the platysma myoides, had been removed, by the 

 person who flayed the animal in order to preserve 



