Number 48. Macropus laniger. This name must be rejected as the animal is not wool-bearing. The skin in the Paris Museum is made up with the skin of a sheep. M. Desmarest's description of the female M. rufogriseus in the New Dictionary, very nearly agrees with this species, but Mr. Gould is inclined to consider the specimen he was shown for that species in the Paris Museum was M. major. Number 57. Halmaturus elegans. The description of Mr. Lambert is so short that it has hitherto been considered impossible to determine it with accuracy; but on comparing the coloured plate which is bound up with Sir Joseph Banks' copy of the volume of the Transactions containing the paper, now in the Museum Library, with the specimens of kangaroos in the Museum collection, I have very little doubt of its being intended for one which Mr. Gould considers as identical with M. ruficollis of M. Desmarest. M. Desmarest's animal is said to come from King's Island, in Bass Strait, while Mr. Gould's animal, like the one Mr. Lambert described, is from New South Wales. Mr. Gunn remarks that H. billardieri is common in the locality indicated by M. Desmarest. Number 67. Petrogale brachyotis. This species was discovered by Captain G. Grey, in his expedition, and the specimens he collected he gave to Mr. Gould, who described them, and is now about to figure them in his forthcoming monograph of the species of kangaroos: a work which will be as far superior to any other published on Mammalia in beauty of design and accuracy in the execution of the plates as his work on Birds has been to any that has hitherto appeared either in England or on the Continent. The specimens are now in the collection of the British Museum. Number 84. Mus lutreola. Back black and yellowish grizelled, with longer black hairs; sides yellowish grey, beneath grey lead colour, under fur lead colour; ears with scattered short adpressed hairs; whiskers black; front teeth yellow; tail with short black adpressed bristles; length of body and head 7, tail 4, hind-feet 1 1-4 inches. The water-rat of the South Australian Colonist. Inhabits South Australia, River Torrens, Bass Strait, New South Wales; Musquito Islands and Macdonald's River, Van Diemen's Land, Tasman's Peninsula. J. Gould, Esquire. Number 85. Mus greyii, Gray. Fur brown, with close long slender pale-tipped black hairs; sides yellowish-brown; throat and beneath yellowish; feet whiteish; ears nearly naked, with close-pressed short greyish hairs; tail with close-pressed brown hairs. Variety; belly rather more greyish-white. Inhabits South Australia, June. Length, body and head 6, tail 4 3/4, hind-feet 1 1/12 of an inch. Number 86. Mus adelaidensis.