Carruthers backed off the path into the underbrush, dragging the girl after him. The jaws of the huge animal opened wide with anticipation. Lumberingly he turned from the path and followed. Trees crashed before its gigantic bulk. The woods became a bedlam of snapping branches. The horrified scream of the girl ended in a gurgling sigh. She toppled to the ground in a dead faint. Carruthers flung himself beside her crumpled body and gathered it into his arms. A quick glance he threw at the spot where he had last seen the gigantic ape. The animal was no longer there. It had disappeared. The man's lips became a hard, straight line. Even as he straightened to his feet the leaves and branches of an overturned tree whipped his face. The red mouthed dinosaur was perilously near. So close that Carruthers could smell its great, glistening body. The odor was musky and foul. Stumbling blindly he attempted to widen the distance between himself and his pursuer. But the hungry dinosaur pounded steadily on its course. There was no getting away from it. Its beady eyes sought out its prey and its keen smell told it exactly where the earth beings were. On and on staggered Carruthers. The extra burden of the girl hampered his movements. Unseen roots tripped him time and time again. Each time he scrambled to his feet and picked up the unconscious girl. Briars tore at his clothing and stung his hands. The underbrush was thickening. A warm, dank smell clung to the vegetation now almost tropical in nature. Beads of sweat rolled down the man's forehead and into his eyes. But the horrible fear of those red, dripping jaws spurred him to renewed efforts. He doubled to the left, hoping to throw the animal off his tracks. The undergrowth seemed to thin out at this point. Renewed hope flowed through the young scientist's blood. He stumbled on blindly, scarce watching where his feet were taking him. A sigh of relief came to his lips. Ahead of him he saw a clearing. His stride lengthened and he broke into a shambling run. * * * * * Then it was he saw, towering walls rising up on both sides of him--steep walls that he could never scale, even if alone. He tried to change his course, but the huge bulk of the pursuing dinosaur effectively blocked his path. There was no alternative but to push on and pray for an opening in the rugged cliffs. Abruptly a sigh of despair escaped his lips. The walls of the canyon narrowed suddenly, and across it stretched a wall of bare rock. He realized too late that he had returned to the base of the plateau where he had spent the night. The grim, towering walls hemmed him in completely from three sides. At the fourth side bulked the dinosaur, coming slowly, ponderously. Beady eyes peered down cunningly at the helpless man and woman. Confident now that its prey couldn't escape, it extended its huge bulk across the narrow canyon for a leisurely killing.