AMERICAN FLAMINGO. 



175 



The number of rings is 330. The bronchi are wide, short, compressed, of 

 about 15 half rings. 



The aperture of the glottis is 6 twelfths long; at its anterior part is a 

 transverse series of 12 short papillae directed forward, and behind it are 

 numerous pointed papilla?, of which the middle are largest. The muscles 

 of the upper larynx are two, one passing obliquely from the edge of the 

 marginal cartilage to the edge of the thyroid bone, for the purpose of open- 

 ing the aperture of the glottis; the other passing from the fore part of the 

 edge of the thyroid bone to the base of the cricoid and arytenoid, for the 

 purpose of pulling these parts forward, and thus closing the aperture. The 

 contractor muscles are of moderate strength, and the trachea is enveloped in 

 numerous layers of dense cellular tissue. The sterno-tracheals, which are of 

 moderate size, are in part a continuation of the contractors, which moreover 

 send a slip to the inferior larynx. 



Fig. 1. Fig. 3. 



