134 PHYSIOLOGICAL SERIES. 



longus is attached very high up on the radius. The 

 pronator and supinator muscles are weak, as well as all 

 the muscles belonging to digit v. There is no extensor 

 pollicis brevis. 0. C. 64 M i. 



For the Anthropoids : Hepburn, Jour. Anat. & Physiol., 

 vol. xxvi. 1891-92, p. 149. 



C. 164. Left arm of a Gibbon (Ilylobates leuciscus), showing the 

 deep muscles. The pectoralis minor is attached to clavicle 

 and coracoid process. The latissimus dorsi (as in the other 

 Anthropoids with exception of the Gorilla) is united to the 

 teres major before its insertion. The dorso-epitrochlearis 

 is short and broad ; its fibres run diagonally to the inter- 

 muscular septum, and are attached to it between the 

 proximal two-thirds. The short head of the biceps arises 

 from the coracoid, and from nearly the whole length of the 

 humerus ; most of its fibres join the long head, but those 

 that rise nearest the elbow run directly to the surface of 

 the supinator lougus. There is a flexor longus pollicis. 

 0. C. 64M?w. 



Keith, Nat. Sci., vol. ix. 1896, p. 373. 



C. 165. Right arm of an Orang-Outang (Simla satyvus) and 

 lower part of the left arm, showing respectively the super- 

 ficial and deep muscles. The pectoralis major has a slight 

 origin from the clavicle. The pectoralis minor is attached 

 to the coracoid and scapular end of the clavicle. The dorso- 

 epitrochlearis is of medium development. There is no 

 coraco-brachialis brevis. The two heads of the biceps 

 are separate through their whole extent (a fairly common 

 variation in the Orang) ; both are inserted on the radius ; 

 there is no fascial insertion. Pronator teres and supinator 

 longus are both inserted higher up the radius than in Man. 

 There is no tendon from the flexor profundus to the thumb. 

 Extensor pollicis brevis is present as a subdivision of the 

 extensor ossis metacarpi pollicis. The pronator quadratus 

 is very weak. Extensor lateralis (ext. min. dig.) supplies 

 iv. dig. & v. dig. 0. C. 64 Md. 



Presented by C. Dent, Esy. 



C. 166. Distal part of the right arm of an Orang-Outang (Simia 

 satyrus), in which the deep flexors arid lumbricals are more 



