ANHINGA OR SNAKE-BIRD. 159 
diameter of 2 twelfths, is closed by a semilunar valve or flap, and is sur- 
rounded by a disk of radiating ruge three-fourths of an inch in diame- 
ter. The intestine, g 4, is 3 feet 4 inches long, its average diameter 
21 twelfths, but only 1 twelfth at its junction with the rectum, which is 
31 inches long, 3 twelfths in diameter. The cloaca globular, 14 inch 
in diameter. There are no ceca properly so called, but a small rounded 
termination of the rectum 2 twelfths in length as in the Herons. 
