They had come upon the footprints where the path made a turn, leading into a dense growth of trees and underbrush. And as Carruthers knelt beside the path he heard a rustle as of something moving directly behind him. Wonderingly, he turned his head to trace the disturbance. But the woods seemed empty. "Strange," he murmured. "Did you hear something moving in back of us, Nan?" Nan shook her head. "You don't think we're in any danger from these beasts, do you?" Carruthers said nothing for the moment. Instead, he looked sharply in all directions and saw nothing. "Let's push on till we come to some kind of a shelter. Perhaps we'll find people much like ourselves." Down the path they hurried, glancing curiously right and left at unknown flowers and trees. A bird with brilliant feathers skimmed above their heads, uttering shrill cries. Other voices from the birds and animals in the woods took up the cry. The woods grew denser as they pushed into the unknown. In the woods at their right a rodent squeaked as some larger animal pounced upon it. Presently they came to a pool of water roughly seventy feet across. While they knelt to quench their thirst they saw two young deer eyeing them from the far side. Soft feet pattered behind the kneeling couple. Carruthers half whirled as he rose to his feet and peered into the jungle behind him. A blur of reddish brown vanished behind a tree. Man or animal Carruthers couldn't determine. He grasped Nanette by the arm and pulled her back to the path. "Quick!" he whispered. "There's someone or something following us. I'm sure of it now." * * * * * Nanette's voice trembled slightly. "What is it, Aaron?" "I don't know." He turned his head again. This time he saw the thing that was following. A low ejaculation of alarm escaped his lips. A gigantic ape! The mouth of the creature sagged grotesquely, revealing two rows of yellow fangs. And its orange colored eyes were burning coals set close together. Carruthers sucked in a deep breath. "Run, Nan," he gritted. "I'll try and scare him away." Simultaneously with the scream of fright from the startled girl, a huge mountain of grayish flesh and bones blocked the downward slope of the path. Carruthers paled as he turned and faced the new menace. Coming directly toward them he saw an immense animal so great in size that it seemed to shut out the light. A prehistoric dinosaur! It came slowly and leisurely, swinging its great red mouth from side to side. Other denizens in the woods, sensing the presence of the huge killer, fled in a panic of alarm. Their shrill cries increased the terror that froze the hearts of the two earth people. Nanette clung to her companion in abject terror, unable to move. Her fear stricken eyes were wild and staring as the mountain of flesh pushed towards them. The animal's long neck arched far in front of its body, and its long, pointed tail remained out of sight within the trees.