ORDER GALLINJi. 123 



pectoral muscle, advances tliere only the length of two inches, 

 makes a curve to the left, and repassing over this same right 

 muscle the length of the crest of the sternum, follows its 

 direction towards the lungs. The rings of the trachea are 

 alternate, and have in their interstices tolerably broad mem- 

 branes. Towards the upper larynx the trachea widens like 

 a funnel. At the bottom of the glottis is a very prominent socle. 

 The hinder part of the tongue and the edges of the glottis 

 are furnished with sharp asperities. The upper larynx is sup- 

 ported by the extremity or tail of the hyoid bone, and thereby 

 attached to the tongue, as in the pauxis, the turkeys, and the 

 peacocks ; while in the hoccos, the cocks, and the pheasants, 

 the tail or extremity of the hyoid bone does not support the 

 upper larynx, which is attached in the membranous tissue of 

 the oesophagus, and thereby capable of being lowered or con- 

 tracted, according to the tone which the animal is desirous of 

 producing. The sinuosity which the tube of the trachea 

 describes over the muscle of the breast is fixed there by a 

 membranous and cellular tissue, as in the Crax Pauwi, and 

 in all the rest of the Penelopes. 



This Guan inhabits Brazil and Guiana. 



The Penelope Cumanensis and Pipile of Latham are 

 united under one name by M. Temminck, Penelope Siffleur, 

 which we may translate Whistling Guan, but which is the 

 Piping Curassow of Latham and the text. To this M. Tem-' 

 minck adds the Yacou of Bajon, and the Yacou Apeti of 

 D'Azara. All these different names have relation to this one 

 species, which is distinguished from its congeners by external 

 characters, very easy of recognition. Its general colours will be 

 found in the text. We shall here add a few important par- 

 ticulars. The crest is white ; the naked part in front of the 

 neck is less considerable than in the preceding species, and it 

 has a great number of small feathers pretty close, in the 

 interstices of which the red skin is visible. A small pro- 



