Some of the observations embodied in this paper date back as far as the year 1852, but the greater number are the results of a nine months' sojourn on the Lower Murray and Darling, where, encamped in the neighbourhood of Gol Gol, I was enabled, with the assistance of Messrs. Williams and their devoted natives, to thoroughly investigate the fauna of that part of Australia.

I cannot speak too highly of the valuable co-operation of these gentlemen, the same whom Mr. Landsborough met on his return journey at the Warrego pushing on towards the Gulf, and whom he designates "the best of Australian Bushmen."

The Placental Mammals of this district are of course few. They belong to the Bats, (Nyctophilus, Scotophilus, Rhinolophus,) the Rodents, (Hydromys, Hapalotic, Mus,) and the Carnivora, which are represented here, as in the rest of Australia, by the Dingo alone.