672 



DR. P. CHALMERS MITCHELL ON THE 



There is no cucullaris propatagialis. The patagial tendons arise 

 solely from the deltoides propatagialis and from the pectoralis 

 propatagialis, and there are no anchors to the humerus. 



The origin of the deltoides patagialis is from the clavicle, 

 acrocoracoid ligament and part of the scapula, the latter origin 

 not being found in Herons. Distally it splits into two peaks, a 

 smaller from which the longus tendon arises and a larger for the 

 bi-evis tendon. This is a mor-e specialized condition than in 

 Steganopods, Storks and Herons generally, where even the longus 

 and brevis tendons have a short common course, but in Scojms 

 and Leptoptilus there are separate peaks for the tendons. 



Text-%. 127. 



Insertion of Biceps ligament. 



R. Radius. U. Ulna. Bi. Biceps tendon : 1, insertion to radius ; 2, insertion to 

 radio-ulnar ligament; 4, insertion to ulna; 5, second superficial insertion to 

 ulna ; 3, radio-ulnar ligament. L.li. Humero-ulnar ligament. 



The longus tendon (text-fig. 126, Lon.), after being reinforced 

 by a slip from the pectoral, enlarges in Avidth and becomes elastic, 

 this portion being doubled, and being anchored by a very faint 

 (much fainter and more diffuse than would appear from the 

 drawing in fig. 126) set of fibres from the distal portion of the 

 brevis. 



The brevis tendon (text-fig. 126, Brev.) is highly specialized. 

 The main mass of the muscle passes into a strong rounded tendon 

 which is reinforced by the pectoralis slip and represents the con- 

 joined ft and jo slips of Fiirbringer, the beta slip being the direct 

 continuation of the muscle, but giving off half-way down the 

 patagium a broader and Aveaker alpha slip. The latter itself 

 becomes doubled distally, gives ofi" a weak anchor to the elastic 

 portion of the longus tendon and is inserted to the extensor 

 metacarpi radialis tendon. The beta slip broadens out as it 

 reaches the fascia over the extensor, sends forward a stout anchor 

 which covers and is fused with the tendinous head of the extensor 

 metacarpi, and sends downwards a branch which forms a forked 

 fan reaching the distal edge of the forearm. The gamma slip of 



