Nelson had no time to further study the array, for he whirled about as from the Atlantean army arose a deep, horrified shout. He stood paralyzed, his jaw slack. For there, waddling slowly forward, came the most fantastic huge creature imaginable. Unspeakably repellent and horrible, it stood on short legs thick as mature trees, to tower at least thirty-five feet above the ground at the fore-shoulders! An immense reptilian neck some twenty-five feet long weaved continuously back and forth, while a surprisingly small, bullet-shaped head emitted rumbling grunts. "Great God!" gasped the horrified aviator, and felt the ground sway under him. "It must be ninety feet long!" Paralyzed by a dreadful fascination he watched the ungainly, hill-like reptile shuffle ponderously forward and realized that, high on its back, was fixed a small fort, rather like those howdahs or boxes which are fastened to the backs of elephants. Chilled with the nearness of death, Nelson counted six mail-clad warriors in the howdah. Then the true import of the Jarmuthians evil jest struck him with full force. "Six men, they said. And six men there are--but the treacherous devils mounted them on that walking hill-side! Guess Altorius can kiss his six girls good-by right now. Poor Alden! Well, I did my best--a rotten trick." * * * * * At that moment he felt as an ant must feel on beholding the approach of a human. It was terrifying, the inexorable advance of that colossal, fantastic monster. From behind he could hear the infuriated shouts of the Atlantean army. They knew even he could not hope to withstand the murderous onslaught of the beast now entering the duelling space. On came the diplodocus, its vast warty tail trailing over the ground and raising a heavy column of dust, while its mud smeared sides bore out Hero Giles' statement that here was one of those semi-aquatic titans from the steaming swamps of Jarmuth. "Hell! Poor Alden's as good as finished now! What a fool I was to think I could save him!" Obedient to an overwhelming fear, Nelson whirled to flee, then stopped, as, from the depths of his being, a stronger power forbade him to desert his friend to certain death. "Range two hundred and fifty yards," he estimated, and, whipping up the Winchester, sighted full at the ponderous creature's slimy snakelike head. When the recoil jarred his shoulder, Nelson dropped the barrel an inch or so to watch. Nothing happened. The great beast was advancing as before, its incredibly long neck weaving steadily back and forth as though to sniff the air. "Hell!" Struck by a sudden thought, he snatched a cartridge from his pocket and, with that strength which comes to men in their hour of mortal peril, wrenched out the metal-jacketed bullet, to reinsert it backwards into the brass cartridge case. Meanwhile the vast brute had drawn nearer, crushing flat a young oak in its path as easily as though it had been a wheat stalk.