350 



On the Myology of the Chimpanzee <&c. 



crural lay internal to the psoas ; otherwise the branches of the 

 lumbar and sacral plexuses were not noteworthy. The coccy- 

 geal gland was very small, far more indistinct than in the 

 Macacus rhesus or cynomolgus. 



The brachial plexus, however, was arranged upon a type 

 diverse from the ordinary human method of arrangement. 

 The method of its branching can be better seen in the figure 

 than it could be understood from a description. 



Brachial plexus of Chimpanzee. 



a, branch to fourth ; b, niuscuhir ; c, suprascapular ; d, anterior thoracic ; 

 e, posterior tlioracic ; /, circumflex ; ff, external cutaneous ; h, median ; 

 1, musculo-spiral ; J, lesser internal cutaneous ; k, internal cutaneous ; 

 /, ulnar; vi, posterior thoracic. 



The general conclusions whicli can be drawn from this dis- 

 section are the following : — 1. The facial muscles and head- 

 muscles in this specimen were even more human than any of 

 those hitherto described. The very strong risorius Santorini 

 noticed by Vrolik may have existed ; but the facial disease 

 matted together the parts in this locality. 2. The neck- and 

 laryngeal muscles were in general also far more anthropoid 

 than pithecoid ; this is especially true regarding the platysma, 

 digastrics, omo-hyoid, and the laryngeal muscles, as well as 

 the scaleni. 3. The back-muscles were anthropoid in the 

 separateness of the levator anguli scapulse and the serratus 

 magnus, in the non-development of the occipital rhomboid, 

 bpt pithecoid in the presence of a dorsi epitrochlear and of a 

 levator claviculge ; the other shoulder-muscles were anthropoid. 

 4. The upper limb-muscles departed from tlie human type in 

 the absence of a coronoid head of the pronator teres, of a 



