1891.] ANATOMY OF THE KAGU. 15 



way along the radius ; soon after this the tendon joins that of the 

 inner head. The inner part of this muscle has a fleshy origin, and 

 it is larger than the outer part of the muscle ; its tendon commences 

 nearer to the origin of the muscle than that of the outer head ; the 

 combined tendons are inserted on to the metacarpal of digit i. 



Dr. Shufeldt, in his careful account of the myology of the Raven, 

 [20], mentions only a single head to this muscle ; and the same thing 

 occurs in other birds. 



(2) The Supinator is a strong muscle attached up to about the 

 middle of the radius ; it is not in any way fused with the extensor 

 communis digitorum, as I understand it to be in the Raven from 

 Shufeldt's description. 



(3) The Extensor digitorum communis arises by a distinct tendon 

 from the humerus in common with the supinator ; the muscle passes 

 into its tendon of insertion at about the middle of the forearm ; the 

 tendon passes round a smooth surface at the distal end of the ulna 

 in common with that of the flexor metacarpi radialis, and is attached 

 to the proximal end of the first phalanx of the index, having pre- 

 viously given off a branch to the thumb. 



In the Raven, according to Shufeldt, the insertion is on to the 

 second phalanx of the index. 



(4) The Extensor pollicis longua arises chiefly from the radius, but 

 also from the septum between itself and the anconseus. 



(5) The Extensor indicis longus is formed of two parts — one head 

 arising from the lower side of the radius near to its distal end, the 

 other from the carpus. 



(6) The Ectepicondylo-ulnaris is a strong muscle, arising by a 

 tendinous origin from the outer condyle of the humerus ; it is in- 

 serted along rather more than one half of the ulna. 



(7) The Extensor metacarpi ulnaris arises from the external con- 

 dyle of the humerus ; closely attached to it is a tendinous sheet 

 connected with the tensor patagii brevis tendon ; it is inserted by a 

 long tendon to metacarpus, which arises not far from the wrist- 

 joint. 



(8, 9) There are two pronator muscles, of which the upper is the 

 larger. 



(10) Flexor digitorum sublimis. — This muscle is visible when the 

 skin is removed ; it is related to a strong tendinous sheet connected 

 with the remiges ; the muscle itself is largely covered by the flexor 

 carpi ulnaris ; its tendon divides into two, the shorter being attached 

 to the wrist, the longer passing down in company with the tendon 

 of the flexor digitorum profundus. 



(11) The Flexor digitorum profundus arises from a part of ulna 

 just in front of attachment of brachialis internus ; it is for a very short 

 space overlapped by this muscle ; it also arises from radius ; the 

 tendon ends upon proximal end of last joint of the 2nd finger. 



(12) The Flexor carpi ulnaris is a very large muscle arising by a 

 strong tendon ; the distal extremity of the muscle divides into two 

 tendons^ — -one is short and strong and is attached to the ulnare ; the 

 other passes down the index digit and is attached to metacarpal iii. 



