THE COW-PEN-BIRD. 



twelfths. The coeca, 1 inch distant from the extremity, are 3 twelfths long, 



^ twelfth in diameter. 



The trachea is 2 inches 2 twelfths long, rather wide 

 in proportion to the size of the bird, although not 



more than lj twelfths in diameter. 



The rings are 



5S; the bronchial half rings about 15. The lateral 

 muscles are moderate; the sterno-tracheal extremely 

 slender. There are four pairs of inferior laryngeal 

 muscles, as in all the singing-birds, whether thick- 

 billed or not. 



The digestive organs of this bird are in all respects 

 precisely similar to those of the Finches, Grosbeaks, 

 Buntings, and other allied genera. 



The oesophagus, a b c d, is considerably dilated on 

 the neck; the stomach, e, is a strong muscular gizzard, 

 having the lateral muscles large and distinct, the lower 

 prominent, the epithelium longitudinally rugous. The 

 intestine, of which the commencement only is here 

 represented, f g, is rather short and of moderate 

 width. The coeca are an inch distant from the ex- 

 tremity, and about a quarter of an inch in length; and 

 the rectum forms only a slight dilatation in place of a 

 cloaca. 



C«l 



