372 



STRUCTURE AND CLASSIFICATION OF BIRDS 



from the humerus just below the insertion of the deltoid, 

 and is inserted near to the insertion of the biceps. The 

 e.cpansor secunda riorum is present. 



The syrinx of Bhinochettis is tracheo-bronchial, and 

 presents us with no features of special interest. The 

 accompanying drawing (fig. 181) shows its lateral aspect. 

 The bronchidesmus is incomplete ; the intrinsic muscles are 

 attached to the third bronchial semi-ring. 



The number of cervical vertebra is sixteen. Four of the 



Bi.l 



FIG. 180 MUSCLES OF FORE LIMB OF 

 liJiinochetus (AFTER BEDDARD). 



I), D2, deltoid ; Ldl, LAI, latissimus dorsi ; Bil, biceps ; 

 Jii2, accessory biceps ; Jf, nerve. 



FIG. 181. SYRINX OF 

 Rhinochetus (AFTER 

 BEDDARD). 



last dorsal vertebra are ankylosed. Five ribs articulate with 

 the sternum. The sternum is unnotched. The skull is 

 schizorhinal ; there are no basipterygoid processes. There 

 is a partial bony internasal septum not to be found in the 

 cranes. The interorbital septum is more fenestrate than in 



