Another specimen, purchased at a high price by Dr. Bennett, was presented by him to the Zoological Gardens, London, where it lived for several months. Its skin is now in the British Museum. Of this bird Dr. Bennett says that, while in his possession, "it never became domesticated, nor evinced the slightest attachment to the lady who fed it; it was the same to her as to strangers." Dr. Bennett does not consider the Didunculus a bird which could be readily reconciled to captivity; "for some time it would be comparatively tame, and then, without any apparent cause to account for the change, it would become very wild." Walpole says that the Didunculus makes its nest on the ground, and that both parents incubate the eggs. * * * * * TRUE GALLINACEOUS BIRDS. The TRUE GALLINACEOUS BIRDS are so named because they present a general resemblance, both in their structure and habits, to our common Barn-door Fowls. They are usually of a moderate or rather large size, and of a stout and somewhat heavy build. They have a small head, often partially or wholly denuded of feathers, and a bill of moderate length, of which the upper mandible is distinctly arched and overhangs the lower, both at the tip and along the margins. As they are all essentially terrestrial in their habits, their legs are always strong and well-developed. The tarsi are stout, and very commonly armed with a spur, or even with two or more such weapons, which are especially developed in the males. The toes are three in front and one behind, the latter being usually small and slightly elevated on the back of the tarsus, but sometimes more elongated, and then placed upon the same level as the other toes, so as to be efficient in grasping. The anterior toes are not very long, but stout, and often united by webs at their base; they are armed with strong, but rather blunt nails, which are of great use in scratching up the ground in search of food--a habit common to most of the species, from which, indeed, many ornithologists give them the name of RASORES, or SCRAPERS. The feathers of the legs are continued down to the articulation of the tarsus, and sometimes extend beyond this point, even to the extremities of the toes. The wings are generally short and weak in comparison with the weight of the body, so that they fly heavily and only to short distances. Their plumage is firm and often adorned with brilliant colours, and parts of it, especially in the males, are frequently developed to an extraordinary extent, sometimes giving them a grotesque appearance. The feathers are remarkable for the great development of the accessory plumules springing from the base of the stem at its junction with the quill.