©RANG OUTANG. 



the skin. The muscles which move the eye-ball 

 do not differ from the corresponding parts in man. 



There is a striking similarity between the Orang 

 Outang and man, in the number and position of 

 the small muscles about the palate, tongue, pharynx, 

 and larynx. There is not one wanting in the ape ; 

 but as there is no styloid process in this animal, the 

 stylo-hyoideus, the stylo-glossus and stylo-pharyn- 

 geus, take their origin from the base of the pars pe- 

 trosa of the temporal bone. The temporal and 

 masseter muscles are stronger than in mam but not 

 so powerful as in the Simia Maim on. The princi- 

 pal peculiarities that we observed about the muscles 

 of the head, are in the digastricus and mylo~hyoi~ 

 deus. 



The digastricus has anteriorly a single flat belly, 

 attached to the lower jaw, for about half an inch on 

 each side of its symphysis, and passing toward the 

 larynx ; near which it is bordered by a semicircular 

 tendon. The extremities of this tendon are carried 

 to the os hyoides, and attached to it at the insertion 

 of the stylo-hyoideus ; where, uniting with addition- 

 al fibres, they form the long round tendons of the 

 two smaller bellies of the digastric muscle, which 

 (as the mastoid process is wanting in this animal) 

 are carried farther back than in man, and inserted 

 among the inequalities at the base of the occipital 

 bone. A disposition nearly similar was observed in 

 the digastricus of the Simia Maimon. It seems in- 

 tended to give greater power in depressing the jaw 



