Comparative Myology of the Chi?npanzee. 365 



three fleshy parts to above the middle of the arm, and the 

 part supplying the index finger still higher; this becomes 

 tendon at the wrist, the middle portion about an inch 

 higher, while that going to the ring finger is the largest, 

 and continues fleshy below the end of the ulna ; the ten- 

 don of the middle one is the largest. The Extensor mini- 

 mi dig'iti is separate from the preceding as high as the part 

 supplying the index finger ; it is slender, but continues 

 fleshy below the wrist. Neither Mr. Moore nor I found 

 any tendon from the Extensor conmiunis to the little finger, 

 nor does Vrolik mention it ; but there was such a tendon 

 very distinct in Duvernoy's Gorilla. The Extensor pro- 

 prius indicis was as in man, but perhaps arose a little 

 lower down on the ulna. 



Palmaris longus and P. brevis. These are not constantly 

 present in the Quadrumana ; the former was in this Chim- 

 panzee, as in Vrolik's, but it does not exist in the Gorilla 

 according to Duvernoy, and Prof. Wyman does not men- 

 tion it. It was wanting in one arm of Traill's Chimpan- 

 zee, but present in the other, and Mr. Moore found it in the 

 right arm of Ateles Paniscus, while Mr. Folsom did not in 

 the left. I did not see any P. brevis, but Vrolik says it 

 existed in his specimen. It was present in the Gorilla of 

 Duvernoy, but not in that of Prof. Wyman. 



Flexor sublimis digitorum. This in the left arm was as 

 in man, but in the right arm Mr. Moore is certain that the 

 ring finger received two tendons, and the little finger none. 

 The Flexor profundus digitorum is very thick and strong. 

 As in Duvernoy's Gorilla, the portion supplying the index 

 finger is separate from the rest, and joined with the long 

 flexor of the thumb ; the remainder occupies the place of 

 the entire Flexor communis in man. (For the shortness 

 of its tendons, see above.) The Flexor proprius indicis et 

 poinds arises from the radius, in the position of the Flexor 

 poinds only in man ; it sends a strong tendon to the index 

 finger ; from the lower surface comes off" a slender tendon 



