1880. | Sandhill and Whooping Cranes. III 
The following short description of the course of the trachea 
within the keel in canadensis will be sufficient in connection with 
the drawing presented: Entering the keel at its lower anterior 
angle, the trachea follows the lower edge of the keel for about an 
FIG, II —GRUS AMERICANA. 
: inch and then curves strongly upward and forward, until K F ki e 
-turned nearly one-half of a circle, when it passes by a scarcely e 
perceptible curve to the upper anterior point of the sternum; 
lyi ing for a part of the distance in a groove formed for its recep- 
tion in the body of the bone and which is visible as a semi-c ylin- 
Sven Eesection on the inner surface of the : sternum in 
