GREAT AMERICAN EGRET. 607 
rectum, bdf, is 3 inches long; the cloaca, def, globular, 12 inch in dia- 
meter ; the ccoecum, ¢, single, as in the other Herons, 3 twelfths long, 
and nearly 2 twelfths in diameter. 
The trachea is 1 foot.94 inches long, of nearly uniform diameter, 
flattened a little for about half its length, its greatest breadth 33 
twelfths ; the rings 285, the last four rings divided and arched. The 
contractor muscles are extremely thin, the sterno-tracheal moderate, 
and coming off at the distance of 1 inch from the lower extremity, 
from which place also there proceeds to the two last rings a pair of 
slender inferior laryngeal muscles. The bronchi are very short, of 
about two half rings. 
TAPAYAXIN. 
The animal represented on the plate is the Tapayaxin of Hernan- 
dez, Phrynosoma orbicularis of WircMann, Tapaya orbicularis of Cuvier. 
The specimen from which it was drawn was entrusted to my care by 
my friend Ricuarp Hartay, M. D., to whom it was presented by Mr 
Nutra, who found it in California. A notice respecting this spe- 
cies by Dr Hartan will be found in the American Journal of Science 
and Arts, vol. xxxi. 
