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 papillse directed forward, and behind it are 
numerous pointed papillae, 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. 
