We accomplished about eight miles in a straight line to the westward, but went over a much greater extent of ground; as I mistook a large though dry creek from the northward for the river, and followed it about four miles; when, finding my mistake, I crossed about four or five miles of rich treeless plains, and reached the river again at the foot of a long high range to the westward. Other ranges appeared to the eastward and northward. As we approached the river, we passed some sandstone hills covered with a dense scrub exactly like that of the sea coast south of Limmen Bight. It was principally composed of several species of Acacia of Grevillea chrysodendron (R. Br.), and of the Bossiaea with broad stem. All along the outside of the scrub, we observed old camps of the natives; several of whom were seen crossing the plains. The bed of the river became excessively wild: the Pandanus channel was still full of water, and running; but the dry bed was full of rocky water-holes or chains of them, composed of, and scattered over with blocks of sandstone; and overgrown with most magnificent Casuarinas, with tea-trees and flooded-gum (or its representative). Large camps of the natives were full of the shells of lately roasted mussels (Unios), the posterior part of which appeared to be much broader, and more sinuated, than those we had hitherto seen. John and Charley found the head of an alligator; and the former caught the broad-scaled fish of the Mackenzie (Osteoglossum), which weighed four pounds. The mosquitoes, and a little black ant, were very annoying during the warm but slightly dewy night.