beneath me. It was, as seen from this height, of an oval contour, with a breadth of about thirty miles and a width of twenty. Its general shape was that of a shallow funnel, all the sides sloping down to a considerable lake in the centre. This lake may have been ten miles in circumference, and lay very green and beautiful in the evening light, with a thick fringe of reeds at its edges, and with its surface broken by several yellow sandbanks, which gleamed golden in the mellow sunshine. A number of long dark objects, which were too large for alligators and too long for canoes, lay upon the edges of these patches of sand. With my glass I could clearly see that they were alive, but what their nature might be I could not imagine.
From the side of the plateau on which we were, slopes of woodland, with occasional glades, stretched down for five or six miles to the central lake. I could see at my very feet the glade of the iguanodons, and farther off was a round opening in the trees which marked the swamp of the pterodactyls. On the side facing me, however, the plateau presented a very different aspect. There the basalt cliffs of the outside were reproduced upon the inside, forming an escarpment about two hundred feet high, with a woody slope beneath it. Along the base of these red cliffs, some distance above the ground, I could see a number of dark holes through the glass, which I conjectured to be the mouths of caves. At the opening of one of these something white
