Along the bottom of the canyon through which they had descended a mountain torrent had cut a deep gorge, the sides of which were so precipitous that they found it expedient to follow the stream down into the plain in order to discover an easier crossing, since the stream lay between them and Zoram.
They had proceeded for about a mile below the mouth of the canyon; around them were low, rolling hills which gradually merged with the plain below; here and there were scattered clumps of trees; to their knees grew the gently waving grasses that rendered the Gyor Cors a paradise for the huge herbivorous dinosaurs. The noonday sun shone down upon a scene of peace and quiet, yet Tarzan of the Apes was restless. The apparent absence of animal life seemed almost uncanny to one familiar with the usual teeming activity of Pellucidar; yet the ape-man knew that there were creatures about and it was the strange and unfamiliar scent spoors carried to his nostrils that aroused within him a foreboding of ill omen. Familiar odors had no such effect upon him, but here were scents that he could not place, strangely disagreeable in the nostrils of man. They suggested the scent spoor of Histah the snake, but they were not his.
For Jana's sake Tarzan wished that they might quickly find a crossing and ascend again to the higher levels on their journey to Zoram, for there the creatures would be well known to them, and the dangers which they portended familiar dangers with which they were prepared to cope, but the vertical banks of the raging torrent as yet offered no means of descent and now they saw that the appearance of flatness which distance had imparted to the great Gyor Cors was deceptive, since it was cut by ravines and broken by depressions, some of which were of considerable extent and depth. Presently a lateral ravine, opening into the now comparatively shallow gorge of the river, necessitated a detour which took them directly away from Zoram. They had proceeded for about a mile in this direction when they discovered a crossing and as they emerged upon the opposite side the girl touched Tarzan's arm and pointed. The thing that she saw he had seen simultaneously.
"A Gyor," whispered the girl. "Let us lie down and hide in this tall grass."
"He has not seen us yet," said Tarzan, "and he may not come in this direction."
No description of the beast looming tremendously before them could convey an adequate impression of its titanic proportions or its frightful mien. At the first glance Tarzan was impressed by its remarkable likeness to the Gryfs of Pal-ul-don. It had the two large horns above the eyes, a medial horn on the nose, a horny beak and a great, horny hood or transverse crest over the neck, and its coloration was similar but more subdued, the predominant note being a slaty gray with yellowish belly and face. The blue bands around the eyes were less well marked and the red of the hood and the bony protuberances along the spine were less brilliant than in the Gryf. That it was herbivorous, a fact that he had learned from Jana, convinced him that he was looking upon an almost unaltered type of the gigantic triceratop that had, with its fellow dinosaurs, ruled the ancient Jurassic world.
Jana had thrown herself prone among the grasses and was urging Tarzan to do likewise. Crouching low, his eyes just above the grasses, Tarzan watched the huge dinosaur.
"I think he has caught our scent," he said. "He is standing with his head up, looking about him; now he is trotting around in a circle. He is very light on his feet for a beast of such enormous size. There, he has caught a scent, but it is not ours; the wind is not in the right direction. There is something approaching from our left, but it is still at a considerable distance. I can just hear it, a faint suggestion of something moving. The Gyor is looking in that direction now. Whatever is coming is coming swiftly. I can tell by the rapidly increasing volume of sound, and there are more than one—there are many. He is moving forward now to investigate, but he will pass at a considerable distance to our left." Tarzan watched the Gyor and listened to the sound coming from the, as yet, invisible creatures that were approaching. "Whatever is approaching is coming along the bottom of the ravine we just crossed," he whispered. "They will pass directly behind us."
Jana remained hiding low in the grasses. She did not wish to tempt Fate by revealing even the top of her head to attract the attention of the Gyor. "Perhaps we had better try to crawl away while his attention is attracted elsewhere," she suggested.
"They are coming out of the ravine," whispered Tarzan. "They are coming up over the edge—a number of men—but in the name of God what is it that they are riding?"