188 * 
THE BED-THROATED DIVER. 
Adult Female in summer. 
The female is precisely similar to the male in form and colouring, but is 
considerably smaller. 
Length to end of tail 25 inches, to end of claws 28 T ‘2 ; extent of wings 
43. Weight 3 lbs. 
Male in winter immature. 
Tn this state the principal differences are the following : — The fore part 
of the neck, instead of being of a uniform rich brownish-red, is merely mot- 
tled with that colour ; all the feathers of the upper surface have each two 
white spots towards the end ; the tail-feathers are edged and terminated 
with white ; the colouring in general is somewhat less pure and deep, and 
the bill is of a much paler tint. 
Young bird unfledged. 
The young^are at first covered with a dense elastic down of a greyish- 
black colour, tinged with brown. The bill is bluish-black, its basal edges 
yellow ; the iris reddish-brown. 
The width of the- mouth is 10 twelfths ; but the lower jaw is dilatable to 
1| inches. On the palate are two papillate ridges, with two series of papillae 
on each side of the posterior aperture of the nares, which is oblongo-linear, 
11 inches long, and margined with papillae. On the anterior part of the 
upper mandible are three ridges. The tongue is 1 inch 8 twelfths long, very 
slender, trigonal, flat above, tapering to a horny point. (Esophagus, a b c, 
14 inches in length, at its commencement inches in width, but at the 
lower part of the neck enlarging to 2 inches ; on entering the thorax it 
contracts to 11 inches ; the proventriculus, b c, again enlarges to 2 inches, 
forming a very large ovate sac. The lobes of the liver are very large and 
nearly equal, the length of the one being 3 inches 10 twelfths, that of the 
other 3 inches ^8 twelfths. The stomach, c d ef, is rather large, roundish, 1 
inch 9 twelfths in diameter, a little compressed, its lateral muscles rather, 
thin, the lower somewhat prominent. Its contents are remains of fishes, and 
a great quantity of snjall stones and pebbles. The epithelium is pretty 
thick, dense, with numerous longitudinal rugas. The proventricular glands 
form a belt 1 inch 10 twelfths in breadth. The intestine is 4 feet 11 inches 
long ; its average width 8 twelfths. The coeca, Fig. 2, c c, 2j inches long, 4£ 
twelfths broad, towards the end 6 twelfths, with the extremity rounded. 
The rectum is 2 inches long, with a globular cloaca, b, 1^ inches in diameter. 
Trachea 11| inches long, much flattened, from 6 twelfths to 4 twelfths in 
breadth ; the rings 145, with 2 dimidiate. Bronchi moderate, of 20 half 
rings. Lateral muscles strong ; a single series of inferior laryngeal muscles 
going to the last half ring of the trachea. 
