294 STRUCTURE AND CLASSIFICATION OF BIRDS 



Name of Bird 



Small Iiitest. . Large Intc-r. Cajca 



Penelope cujubi . 



,, cujubi . 



pileata . 



,, jacucaca 

 Pipile jacutinga . 

 ,, cumanensis 

 Aburria carunculata 

 Ortalis albiventris 

 Talegalla Lathami 

 Megacephalon maleo 



anterior end of the sternum and from fibrous septum between 

 it and the pessular process ; these muscles run up the sides 

 of the trachea, reaching further than the sterno-tracheales. 



Where the trachea is convoluted it sometimes happens 

 that the extrinsic muscles are quite abnormal in their attach- 

 ments ; thus in the males of Penelope pileata and Ortalis 

 albiventris the muscles in question do not enter the thoracic 



FIG. 143. SYHINX OF Pctro spicifer. 

 FRONT VIEW. (AFTER GARROD.) 



FIG. 144. SYHINX OF SAME. BACK 

 VIEW. (AFTER GARROD. 



cavity, but pass close to the carina sterni and are inserted 

 at the very end of the sternum. 



The syrinx of gallinaceous birds has been chiefly studied 

 by GAEEOD.' From his paper the following account of this 



1 ' On the Conformation of the Thoracic Extremity of the Trachea in the 

 Class Aves, Pt. 1, The Galling,' P. Z. S. 1879, p. 354. 



