ANATOMY OF THE SHOE-BILL. 677 



coideus, but quite separate from that. Its fil^res convex'ge to a 

 sti-ong tendon inserted to a peak of the median tubei'cle of the 

 humerus. 



Muscles op Forearm and Neck. 



Brachialis inferior. — A very strong flat sheet of muscle with n 

 fleshy origin and insertion, occupying the angle between the 

 humerus and ulna, the insertion to the ulna being twice the 

 width of the origin from the flexor aspect of the humerus. 



Pronator suhlimis or hrevis. — Short muscle from the inner 

 condyle of the humerus to the first quarter of the radius. This 

 insertion is rather shorter than in LeptojJtihis. 



Pronator frofundus or longus. — As in LejitojJtilus a larger 

 muscle, from the inner condyle of the humerus to a little beyond 

 the surface of the radius covered by the brevis and more on the 

 ulnar aspect than the brevis. 



Entejncondylo -ulnar is. — Absent, as in LejJtojMlus, but accord- 

 ing to Gadow present only in Rasores and Tinamus. 



Ectepicondylo-idnaris. — From outer condyle of the humerus to 

 first third of ulna on its radial face. A very thick and strong 

 muscle, closely united with the flexor digitorum profundus. As 

 in Leptoptilus. 



Ectepicondylo-radialis. — A thin muscle arising by a flat tendon 

 from the outer condyle of the humerus along with the extensor 

 digitorum communis, inserted to a quarter of the radius ; as in 

 Leptojytilus, except that the insertion is shorter in the latter 

 bird. 



Flexor carpi ulnaris. — From the inner condyle of the humerus 

 with a sesamoid ; runs down the inner surface of the ulna to the 

 great tuberosity of the ulnar carpal. Arising as a fleshy belly a 

 thinner tendon connected with the quills I'uns down to end on 

 the carpal alongside the great tendon. As in Leptoptilus. 



Ulni-metacarjxdis ventralis. — Fleshy from the last third of the 

 ulna on the radial face ; tendon crosses over a slide on the radial 

 carpal and is insei^ted on a hump of the second metacarpal near 

 the attachment of the pollex. 



Ulni-metacarpalis dorsalis. — Shoi't muscle arising by a tendon 

 from the distal end of the ulna on its lateral face ; it divides into 

 a shorter portion running straight across to the upper part of 

 metacarpal III and a broader portion inserted to about two- 

 thirds of the upper surface of metacarpal III, where that is free. 

 Similar in Leptoptilus., except that the first portion is tendinous, 

 the second fleshy, while both are fleshy in Balceniceps. 



Extensor metacaipi radialis. — Two heads, outer tendinous, 

 inner fleshy, from the outer condyle of the humerus. The outer 

 belly is quite separate from the inner belly and is connected with 

 the brevis tendons of the patagium (text-fig. 126, Ex., p. 671). 

 Insertion to the base of metacai^pal I, the tendons from the two 



4.5* 



