These islands, after the others, of which the greatest height is 12 feet, appear of considerable altitude; though the loftiest point rising on the north-east extreme of East Wallaby Island, measures no more than 50 feet. This island is upwards of a mile each way; whilst the west one is two miles and a half long, and one broad. In the centre of the eastern is a low flat, with hills rising all around, with the exception of the south side. FLAG HILL. The loftiest, which is called Flag Hill, is, as I have mentioned, on the north-eastern extreme, and has a long finger-shaped point running out from its foot in a north-east direction, to which we gave the name of Fish Point, from the number of snappers we caught there. They were so voracious that they even allowed themselves to be taken with a small bit of paper for a bait. Flag Hill is a rock formed of sand and comminuted shells; while the flat which stretches to the south-west from its foot is of limestone formation. In it we found a kind of cavern, about 15 feet deep, with a sloping entrance, in which was some slightly brackish water, that in percolating through the roof had formed a number of stalactites. A reef, which dries in patches at low-water, connects the east and west Wallaby Islands. On the south-west point of the latter are some sandhills 30 feet high; and on that side also is a dense scrub, in which the mutton birds burrow, so that it forms rather troublesome walking. SLAUGHTER POINT. NEW SPECIES OF WALLABY. The northern end is a level, stony flat, terminating towards the sea in projecting cliffs six or eight feet high; with patches of bushes large enough to serve as fuel here and there, all full of a new species of wallaby, which, being plentiful on both the large islands, suggested their name. The reader will obtain a good idea of the numbers in which these animals were found, when I state that on one day, within four hours, I shot 36, and that between three guns we killed 76, averaging in weight about seven pounds each; which gave rise to the name of Slaughter Point for the eastern extreme of the island. As there is no record of the Dutch having visited the northern group, it is impossible to say whether wallaby were then found on it or not. How they could have got there is a mystery, as there were no large floating masses likely to have carried them from the main. The species has been described from a specimen we obtained, as Halmaturus houtmannii; it is distinct from Halmaturus derbyanis, found on most of the islands on the southern parts of the continent.