166 SURF BÜCK.
Adult female. Hate CCCXVI I . Fig. 2.
BiU greenishiblaek ; iris as in the male ; feet yellowish-orange, webs
greyish-dusky, claws black. The general eolourof the plumage is brownish
black ; darker on the top of the head, the back, wings, and tail ;
on the breast and sides the feathers edged with dull greyish-white
Length to end of tail 19 inches,-to end of wings 15f, to end of claws
18 ; extent of wings 31§ ; wing from flexure B| ; tarsus l|.;Vmiddle toe
2f , hind toe T%. Weight 2 lb. 2 oz.
In an adult Male, the tongue is 1 ineh 9 twelfths lung, has numerous
conical papilla; at She liase; is deeply grooved along the middle,
has two lateral series of brisifa, and terminates in a thin rounded lobes
2 twelfths long. On the middle line of the upper mandible are about
ten short conical papillas, and .m each of its margins about 35 lamellae ;
Oil till! lower an equal number. The heart is 1 inch 8 twelfths long,
1 inch 2 twelfths broad. The «sophagus, 8J inches long, isiwide, its
diameter at the upper part being 1 inch, towards; the middle of the
neck 1 inch and a quarter. The provcntricmlus is' 1 | inch long ;. i t s
glanduleg cylindrical, 1 | twelfths in long-til, and, as in all other ducks,
arranged so as to form a complete bolt. The stomach p i a powerful
gizzard of® roundish form, 1 inch 10 twelfths long, 1 inch 10 twelfths
broad, its lateral .muscles very large, the .right 10 twelfths thick, the
left 9 twelfths. In the stomach were various small bivalve sheffl and
much gravel. The cuticular lining longitudinally Mtgous ; grinding
plaies } inch in diameter. Thé intestino, 5 feét 7 inches in length,
luu> an average diameter•of fi twelfths. The rectum is 7J inches long,
8 twelfths in diameter. Of the coeca one is 3 inches 4 twelfths long, cylindrical,
obtuse, 2f twelfths in diameter, the other 4§ inches long.
• The aperture of the glottis is 8 twelfths long, with numerous minute
papilla; behind. The trachëa presents the saine structure as that of the
Velvet Duck. Its upper rings, to the number of 9, are very narrow,
and continuous with a large bony expansion, 7 twelfths l ong , aind 8
twelfths broad. Beyond' this part its diameter is 5 twelfths, gradually
diminishes to 3 twelfths about the middle, then enlarges to 5 twelfths.
In this part the number of rings is 78. Then comes a roundish or
transversely elliptical enlargement, 1 inch 2 twelfths in breadth, 9
twelfths in length, convex before, .-lightly concave behind;}'and composed
of about 12 united rings! The trachea then contract* to 4 twelfths
SURF DUCK.
and presently enlarges « . form the; inferior larynx, which is large, ossified,
but symmetrical. In this space there are 6 distinct rings, and
10 united: The entire length of the tniclioa i s 7J inches, its rmgs are
all osseous and strong. The contractor muscles are very strong, pass
along the sides ofWe'lower dilat&tlSn, (mWfcH&We given off the cleidotracheals,
then continue to the .•„mme.iccm.mt of the inferior larynx,
wherejtbeTftefno-tracheals come off. The bronchial half-rings 25, unossified.
.
The 'cavity of the tui.se is very large, being 2 inches long, | inch
in diameter at the lower part, continued narrow in front over: the dilatation
cawing the. external protuberance of -the fe»of the bill. The
olfactory nerves are of trnxkratc size; the maxillary branches of the
fifth pair very large.