346 Prof. A. Macalister on the Myology of 



The three scalenes were normal, not extending downward 

 on the thorax beyond the second rib, as in man, and thus 

 differing from the arrangement seen in almost all the lower 

 monkeys. There is no rectus sternalis, nor supracostalis, nor 

 was the rectus abdominis prolonged upwards on the thorax. 

 The deltoid was normal, not continuous with the triceps and 

 brachialis as it was in Prof. Humphry's animal [l. c. p. 264). 



The supraspinatus was to the infraspinatus as 10 to 15, the 

 teres minor was one-fifth the size of the infraspinatus, and the 

 subscapularis was nearly equal to the sum of the two spinati. 

 There was no subscapularis secundus or subscapulo-humeral 

 separate ; but a fleshy lower slip of the subscapularis seemed 

 to represent it. The biceps and brachialis anticus were normal, 

 and the two humeral heads of the triceps were with difficulty 

 separated. The anconeus was small, and there was no anco- 

 neus epitrochlearis. The supinator longus did not arise as 

 high as it did in Dr. Wilder' s specimen, but its tendon was 

 attached to the lower fourth of the radius. There was no 

 coronoid origin of the pronator teres. The palmaris longus 

 arose tendinously, and equalled the pronator teres in size. 

 Traill failed to find it on one occasion ; but all other au- 

 thors describe it. The radial and ulnar flexors of the carpus 

 were nearly equal, the radial on the left side being slightly 

 larger than the ulnar, but they were both equal on the right ; 

 this was not the case in Wilder's animal {Joe. cit. p. 363). 



The flexor sublimis was three-eighths of the flexor profundus 

 in weight, and had no radial origin ; this has been remarked 

 before : it had fom* tendons, as usual. Mr. Moore found, in 

 the right arm of the Chimpanzee which he dissected, that the 

 ring-finger received two tendons, and the little finger none ; 

 but in the left arm Dr. Wilder found it as in ours (Wilder, 

 he. cit. p. 365). 



The flexor profundus et pollicis was a single muscle sending 

 off five tendons to the four fingers and thumb ; these all arose 

 side by side, and the indicio-polliceal part was not separate as 

 Wilder found it, or as Duvernoy saw it in the Gorilla ; nor 

 did the polliceal tendon cross the others, as it did in Prof. 

 Humphry's specimen. This polliceal tendon seems thus to 

 vary remarkably in its position and course. Vrolik found it 

 with no tendon to the thumb. Humphry found it in one 

 Chimpanzee as a slender tendon arising from the palmar 

 fascia and going to the last phalanx of the thumb, and in an- 

 other as a long thin tendon from the ulnar side of the flexor 

 profundus {I. c. p. 267). Wyman found it as in ours ; and 

 Wilder found it conjoined with the flexor profundus indicis. 



The pronator quadratus was very small and thin, but occu- 



