208 
BRENT GOOSE. 
duodenum, e g h, has a diameter 
of 4 \ twelfths, and curves at the 
distance of 5 inches ; the intes- 
tine is disposed in longitudinal 
folds, there being 16 turns, and 
measures 5 feet 11 inches in 
length. It retains a pretty uni- 
form breadth as far as the rec- 
tum, Fig. 2, a b, which enlarges 
to 7 twelfths. The casca, a c c, 
which come off at the distance 
of 5 inches from the extremity, 
are 5± inches in length, very 
narrow, their diameter at the 
base being about 1 twelfth, to- 
wards the end 2 twelfths, and 
their greatest breadth toward 
the middle 3J twelfths. In Fig. 
2 is seen part of the oviduct, db, 
which opens at the distance of 
h inch from the anus, opposite 
by and above or anterior to the 
ureters. In this bird there is 
no decided cloaca, which is 
equally the case with other 
species of this family, and with 
such birds generally as pass 
their fasces in a compact cylin- 
drical form. In this respect, 
Swans, Geese, and Ducks are 
analogous to Pheasants, Grouse, and Partridges ; they being in fact aquatic 
Gallinaceas. 
The trachea is 11 inches long, its diameter at the upper partis twelfths. 
It is a little flattened above, less so in the middle, and somewhat compressed 
at the lower extremity, where its diameter is 3 twelfths. There are 150 
free osseous rings, and 15 additional united rings at the lower part. The 
inferior larynx is destitute of muscles. The space between the last ring of 
the trachea and the first bronchial ring is large, being 4i twelfths in length. 
The bronchi are very short, rather wide, with about ten incomplete rings, the 
extremities of which nearly meet. The lateral muscles are strong, and there 
is a pair of cleido-tracheal, and a pair of sterno-tracheal muscles, the former 
