On the upper mandible internally are three series of minute papillæ which become larger on the palate. While the upper mandible is flat beneath, the lower is deeply concave, and its crura elastic and capable of being separated near the base to the distance of three-fourths of an inch. The tongue, which is 2-1/4 inches long, and of a slender form, carinate beneath, with the tip pointed, lies in the deep hollow of the lower mandible, and being deeply concave above, leaves a vacant space, by which, when the bill is immersed in the mud and the tips separated, the food-passes along. The œsophagus is 4-3/4 inches long, 1/4 inch in diameter, and nearly uniform. The proventriculus, _a_, _b_, _c_, is bulbiform, its diameter 6 twelfths. The stomach, _c_, _d_, _e_, _f_, is an oblong gizzard of moderate strength, with the lateral and inferior muscles decided, the tendons large, its length 1 inch, its breadth 8 twelfths. The epithelium is dense, tough, with numerous longitudinal rugæ, and of a reddish colour. The contents of the stomach were very small hard hemispherical seeds and vegetable fibres. The intestine, _f_, _g_, _h_, 19-1/2 inches long, its diameter 3 twelfths in its upper part; the cœca 1-3/4 inch long, and from 1 to 2 twelfths in diameter, with the extremity obtuse. [Illustration] The trachea is wide, flattened, 3-1/2 inches long, 2-3/4 twelfths broad at the top, gradually diminishing to 2 twelfths; the rings about 130. The contractor muscles are very thin, the sterno-tracheal slender; and there is a pair of inferior laryngeal. The bronchial half rings are about 25. YELLOW-CROWNED HERON. _ARDEA VIOLACEA_, LINN. PLATE CCCXXXVI. ADULT AND YOUNG. The Yellow-crowned Heron, which is one of the handsomest species of its tribe, is called “Cap-cap” by the Creoles of Lower Louisiana, in which country it is watched and shot with great eagerness, on account of the excellence of its flesh. It arrives about New Orleans toward the end of March, and departs in the middle of October. On arriving, they throw themselves among the thickets along the bayous, where they breed. Like the Night Heron, this species may be enticed near by imitating its cries, when it approaches, cutting many curious zigzags in the air, and alights close by. It is a curious circumstance that when passing over several gunners placed on the watch for them, they dive toward the ground if shot at and missed, and this they do several times in succession, according to the number of shots. It is in the evening and at dawn that they are chiefly obtained. They are said not to travel in boisterous weather, or when there is thunder; and I have heard the same stated with regard to the Night Heron.