480 



STRUCTURE AND CLASSIFICATION OF BIRDS 



a slip (see fig. 227) uniting the brevis and longus tendon. It 

 must be remembered, however, that this also exists in some 

 eagles. 



In Serpentarius there is a longer attachment of the 

 deltoid to the humerus than in other birds of prey ; and there 

 is an accessory biceps muscle (see fig. 227). : 



tfl 



FIG. 227. TENSORES PATAGII OF Serpentarius (AFTER BEDDARD). 



t.p.l, tensor longus ; t.p.br, tensor brevis ; Bi, biceps ; Hi', accessory bicc-i's : 

 Anc, anconseus ; />, deltoid. 



The anconceus has a very broad tendon of origin from 

 humerus. 



In the syrinx a strong box is formed by the last tracheal 

 ring, and the intrinsic muscles are attached to bronchial 

 semi-ring 2. 



There is a powerful expansor secundariontui. 



1 Cf. Rhinochctus, p. 371. 



