Comparative Myology of the Chimpanzee. 367 



thinks that in the right arm it was united with the Exten- 

 sor brevis, with a double tendon attached to both trape- 

 zium and metacarpal bone. See Duvernoy for his views 

 as to the homologies of these three muscles. 



All the muscles of the little finger were present, as also 

 in the Gorilla. The Lumbricales were like the human, 

 except that the slip supplying the little finger did not arise 

 from the tendon of the deep flexor of that finger, but only 

 from that of the ring finger. The palmar Iriterossei were 

 much, and the dorsal Literossei little, developed. 



I dissected the muscles of the back and of the abdomen 

 only enough to see that the former, as extensors, were 

 weaker than in man, while the latter were stronger, both 

 as very important flexors of the trunk, and as supports to 

 the viscera, in the creature's semi-erect position. 



Psoas parvus. Absent on both sides of this individual. 

 Not mentioned except by Tyson, who says it was larger 

 than in man. Present in the Gorillas of Wyman and 

 Duvernoy, in the Howding- Monkey, in Macaci, and Cyno- 

 cephali. 



Quadratus lumborum. Shorter than in man, as the 

 Pso(S and Illiacus are longer. Mentioned only by Duver- 

 noy as in the Gorilla, and by Wyman as in the Howling- 

 Monkey, where it is more slender than in man, and arises 

 from the transverse processes of the four upper lumbar 

 vertebrae, and from the body of the first. 



Quadratus femoris. Longer and narrower than in man, 

 as noticed by Owen in the Orang, and naturally from the 

 downward projection of the ischium. 



I am quite sure that the other rotators were present, but 

 at the time of the dissection I was not sufficiently familiar 

 with their limits in man to compare them with much cer- 

 tainty. 



Pectineus and three Adductors. These are present, but 

 more intimately connected than in man. They form a 



