Several flocks of a new description of pigeon were seen for the first time; two were shot, and were beautiful and curious. Their heads were crowned with a black plume, their wings streaked with black, the short feathers of a golden colour edged with white; the back of their necks a light flesh-colour, their breasts fawn-coloured, and their eyes red. A new species of cockatoo or paroquet, being between both, was also seen, with red necks and breasts, and grey backs. I mention these birds thus particularly, as they are the only ones we have yet seen which at all differ from those known on the east coast. [Note: See the Plates.] Our visible horizon, in every direction, being merely studded with shrubs and low bushes, gave the scene a singular marine appearance. We stopped about two miles south of the river, not being able to reach it before night-fall, the marshy ground having driven us a considerable distance round. July 4.--During this day's course we repeatedly attempted to gain the situation where we supposed the river to take its course, but were always disappointed; immense swamps constantly barred our attempts to travel northerly; these swamps were now covered with several feet of water, which, from the marks of dwarf trees growing in them, is sometimes three or four feet deeper. The same dead level of country still prevailed; and the sandy deserts of Arabia could not boast a clearer horizon, the low acacia bushes not in any degree interrupting the view. It was remarkable that there was always water where the dwarf box-trees grew; we might therefore be said to coast along from woody point to point, since all attempts to pass through them were uniformly defeated. The soil the same as yesterday, and most unpleasant to travel over, from the circular pools or hollows, which covered the whole plain, and which seem to be formed by whirlpools of water, having a deep hole in the bottom, through which the water appeared to have gradually drained off. It is clear that the entire country is at times inundated, and that as every thing now bears the appearance of long-continued drought, the swamps and stagnant waters are the residuum. In the whole we proceeded upwards of fourteen miles, and stopped for the night upon the edge of one of the swamps, which are now the only places that afford any timber for firing. Some traces of natives were seen today, about three or four days old; they appeared to have been a single family of four or five persons. If there are any natives in our neighbourhood, they must have discovered us, and keep out of the way, otherwise upon these clear flats we could not avoid seeing them. We were again fortunate enough to kill an emu, a most acceptable supply, since continued exercise gives us appetites something beyond what our ration can satisfy.