The upper mandible is broadly and deeply concave. The tongue, which is thick and fleshy, as in other ducks, is 2-2/12 inches long, its sides parallel, slightly sloping, and furnished with two series of bristly filaments; its base with numerous straight conical papillæ directed backwards, its upper surface marked with a broad median groove, the lower flat, its extremity formed by a thin semi-circular appendage, a quarter of an inch in length. The œsophagus passes along the right side of the neck, for six inches has a diameter of 5/12 then dilates to 9/12, so as to form a slight crop, again contracts as it enters the thorax, and in terminating forms the proventriculus, which is 1-3/4 inches in length, with oblong glandules, generally a twelfth of an inch in length. The stomach is a very large and powerful gizzard, of a broadly elliptical form, with extremely thick lateral muscles, the left being 11/12 in thickness, the right 10/12, the tendons large and strong. The transverse diameter of the gizzard is 2-11/12 inches, the longitudinal, from the cardiac orifice to the bulge of the inferior muscle, 2-1/12. Its cuticular lining is of very dense texture, and rugous; the grinding plates opposite the lateral muscles about half a twelfth thick, and slightly rugous. The intestine, which is 5 feet 9 inches in length, first forms in the usual manner the duodenal fold, at the distance of 5 inches from the pylorus, encloses the pancreas, receives the biliary ducts, and passing under the right lobe of the liver, proceeds backward beneath the kidneys, is convoluted in several large folds, and finally from above the stomach, passes in a direct course to the anus. Its coats are thick, its inner surface villous, and its diameter is considerable, being in the first part of the duodenum 9/12, then for two feet from 5/12 to 4/12, enlarged again to 6/12, and so continuing to the rectum, which is 6 inches long, 1/2 inch in diameter, and ends in an enlargement or cloaca, about an inch in diameter. The cœca, which commence at the distance of 6 inches from the anus, are 8 inches long, slender, 2/12 in diameter for 3 inches, afterwards about 3/12, with the extremity obtuse. The œsophagus and stomach contained young shoots of _Zostera marina_, and in the latter were numerous particles of quartz.