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) } 



Fia. 227 — Tensokes Patagu or Serpentarius (after Beddakd). 



Lp.lf tensor longus ; t.p,br, tensor brevis ; Bi, biceps ; Bi', accessory biceps ; 

 Ancj anconseus ; J), deltoid. 



The anconcBus 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 secundariorum. 



' Cf. Bhinochetus, p. 371. 



