I dissected a female in May; an operation which though performed in the open air, was almost sufficient to take away the breath. I found the stomach a long capacious sac without constriction, with thick muscular walls; there was a round cavity just beyond the pyloric bend; the intestinal canal was nearly uniform in size, slender, but long, with many convolutions; it measured 99 inches; near the middle was a curious conformation, which I have observed in the intestine of the _Ardeadæ_; as though the tube had been abruptly terminated and closed, and another tube _let in at the side_ of the former a little way from the end, which end thus projected like a teat. Two cæca, about 1¹⁄₂ inch long when distended. The appearance of the viscera corresponded in most particulars to that described by Prof. Owen (Pr. Zool. Soc. 1835) in _P. rufescens_. The right lobe of the liver was three or four times greater in volume than the left; the former had its edges rounded; the latter was sub-globose. The gall-bladder small; the gall deep brown-yellow. The spleen was large, oval, about 1³⁄₄ by 1¹⁄₄, soft, and greenish-black. Kidneys about equal, 2 inches by 1 inch. The fat about the viscera, which was in series of small lumps, was of a deep orange, or almost salmon-red. I may add that our species seems much more arboreal than that described by Prof. Owen. On bending the heel-joint, so as to bring the tarsus up towards the tibia, the toes were strongly incurved; and on my placing a stick beneath the toes, and then forcibly bending the heel, the stick was grasped with so much power that it could with difficulty be dragged away. I perceived from the form which the foot assumed under such circumstances, that the hind toe is opposed to the others in grasping or perching, notwithstanding their continuity of membrane; the web which connects the hind-toe being wide enough to admit an object like the branch of a tree, when the toes are opposed. The tongue is singularly minute; the _rami_ of the hyoïd bone, passing on each side of the larynx, are simply enveloped in the membranes of the pouch, and at their convergence, there is a minute projecting point of cartilage about ¹⁄₆ inch long, which is the only apology for a tongue. I was astonished to observe that the whole inner surface of the skin on the trunk, was cellular, especially on the breast; composing an immense congeries of membranous cells, inflated with air. The pouch held seventeen pints of water, which when full dripped out at a wound _in the fore-arm_. DUSKY BOOBY.[130] _Sula fusca._ _Pelecanus sula_, +Linn.+—Aud. pl. 207. _Sula fusca_, +Briss.+ [130] Length 29 inches, expanse 58, flexure 14³⁄₄, tail 7³⁄₄, rictus 4⁸⁄₁₀, tarsus 1¹⁄₂, middle toe 3.