GREAT NORTHERN DIVER OR LOON. 57 
inches long, 2% inches in breadth. The stomach is three inches long, 
21 in breadth, of an elliptical form, a little compressed ; its lateral 
muscles 9 lines in thickness, and composed of strong large fasciculi ; 
the tendons 14 inch in diameter; the cuticular lining thick, its up- 
per and lower parts marked with strong longitudinal ridges having 
numerous transverse fissures; the grinding surfaces irregularly wrinkle ', 
with a deep fissure down the middle of each. The pylorus is 8 lines 
in diameter when distended, and is destitute of valve, but has a 
strong prominent rim. In the stomach were remains of fishes, and 
some pebbles, chiefly quartz, the largest 4 lines long. The intestine 
measures 6 feet 6 inches in length, and varies in diameter from 8 
to 6 lines. The rectum is 33 inches long, the cloaca extremely large, 
forming a cavity about 3 inches in diameter. The czeca are 1} inch 
long, cylindrical, rounded at the extremity; one of them 7 lines, the 
other 9 lines, in diameter. 
The trachea, when moderately extended, measures 133 inches in 
length, inconsiderably depressed, its transverse diameter at the upper 
part 92 lines, at the lower 64 lines ; the rings cartilaginous, of mo- 
derate breadth, uniform, with a contraction in the middle before and 
behind, their number 134, the four lowest united. The bronchi are 
composed of about 20 narrow cartilaginous half rings. The contractor 
muscles are very broad but thin, their fibres irregularly disposed in 
front; they become thicker and narrower toward the lower part, and 
are continued beyond the sterno-tracheal muscles, which come off 
from the 20th ring from the inferior larynx, to the membrane between 
the last tracheal and first bronchial ring. 
