MOXKETS. 89 



penscry ligament, which is also used as an argument 

 tnat the natural gait of these animals is not quadruped; 

 for the immense weight of the jaws of the adults, placed 

 so far off the centre, could not possibly be supported in 

 that position, without some provision of this kind. 

 Additional confirmation of this argument is the absence 

 of the suspensorium oculi, a muscle found in quadrupeds, 

 and evidently intended to relieve the others, and be a 

 greater support to the eyes when continued in the 

 prone position. 



These are the principal peculiarities of structure con- 

 nected with progression and attitude ; and it must be 

 at once perceived, that neither the erect or quadruped 

 posture, is the common and natural one of the monkeys, 

 and that they will employ either as occasion requires, 

 in their silvan or rocky abodes. Every other part 

 of the form will present some difference ; but with 

 the exception of the construction of the larynx, and 

 principal organs employed in the faculty of speech, we 

 shall merely mention a few of the remaining most pro- 

 minent peculiarities exhibited by the African and 

 Asiatic orangs. 



There were only four lumbar vertebrae in Dr Trail's 

 orang, in this respect similar to the Asiatic species dis- 

 sected by Messrs Owen and Yarrel. In the first animal, 

 however, there were thirteen dorsal vertebrae, and a 

 similar number of ribs ; in the latter, only twelve of 

 each. The lower opening of the pelvis in the black 

 orang is very large ; the sacrum is very narrow. No 



