Another vile, twisting arm rose from the afterdeck with a screaming figure in its grasp and vanished into the water beyond the yacht.

There were others writhing about the decks. Thorpe saw them as he made his boat fast and clambered aboard.

A wave of reeking air enveloped him as he reached the deck; the nauseous stench from the monster's tentacles was horrible beyond endurance. He gagged and choked as the stifling breath entered his lungs.

A huge rope of slippery, throbbing flesh stretched its twisted length toward the stern. It contracted as he watched into bulging muscular rings and withdrew from the afterdeck. The deadly end of it stopped in mid-air not twenty feet from where he stood. The jawlike pincers on it held the limp form of an officer in its sucking grip, while above, in a protuberance like a gnarled horn, a great eye glared into Thorpe's with devilish hatred.

The beak opened sharply to drop its unconscious burden upon the deck, and the watching man, petrified with horror, saw within the gaping maw great sucking discs and beyond them a brilliant glow. The whole cavernous pit was aflame with phosph.o.r.escent light. Dimly he knew that this light explained the ability of the beastly arms to grope so surely in the dark.

The eye narrowed as the gaping, fleshy jaws distended, and Robert Thorpe, in a flash that galvanized him to action, was aware that his fight for life was on. He fired blindly from the hip, and the recoil of the heavy gun almost tore it from his hands. But he knew he had aimed true, and the toothless, seeking jaws whipped in agony back into the sea.

There were other arms whose eyes were searching the stern of the yacht. Thorpe plunged frenziedly down a companionway for the cabin he knew was Ruth Allaire's. Was he in time? Could he save her if he found her? His mind was in a turmoil of half-formed plans as he rushed madly down the corridor to find the body of the girl a limp huddle across the threshold of her cabin.

She was alive; he knew it as he swung her soft body across one shoulder and staggered with his burden up the stairs. If he could only breathe! His throat was tight and strangling with the reeking putrescence in the air. And before his eyes was a picture of the strong oak bars of his own retreat. Somehow, some way, he must get back to the abandoned ship.

An eye detected him as he came on deck, and he dropped the limp body of the girl at his feet as he swung his rifle toward the glowing light within the opening jaws. The sucking discs cupped and wrinkled in dread readiness in the fleshy, toothless opening. He emptied the magazine into the head, though he knew this was only a feeler and a feeder for a still more horrible mouth in the monstrous body that rose and fell tremendously in the dark waters beyond. But it was typical of Robert Thorpe that even in the horror and frenzy of the moment he rammed another clip of cartridges into his rifle before he stooped to again raise the prostrate figure of Ruth Allaire.

The forward deck for the moment was clear; it rose high with the weight of the writhing, twisting arms that weighed down the stern of the yacht where the crew had taken refuge.

To think of helping them was worse than folly--he dismissed the thought as another great eye came over the rail. Once more he used the gun, then lowered the girl to the waiting boat, and cast off and rowed with the stealthiest of strokes into the dark.

Behind him were whipping points of light above the white brilliance of the yacht _Adelaide_. The boat was tossing in great waves that came from beyond, where a body, incredibly huge, was tearing the waters to foam. There were ghostly arms that shone in slimy wetness, that lashed searchingly in all directions, as the monster gave vent to its fury at Thorpe's attack. There were screaming human figures grasped in many of the jaws, and the man was glad with a great thankfulness that the girl's stupor could save her from the frightful sight.

He dared to row now, and his breath was coming in great choking sobs of sheer exhaustion when at last he pulled the senseless form of Ruth Allaire to the deck of the _Nagasaki_ and drew her within the frail shelter of the wireless room.

Stout had the oaken bars appeared, and safe his refuge in the barricaded room, but that was before he had seen in horrible reality the fearful fury of this monster from the deep. He placed the braces against the door and turned with hopeless haste to seize the wireless key.

"_Bennington_," he called, and the answer came strong and clear.

"Where are you.... Help--" His fingers froze upon the key and the answering message in his ears was unheeded as he watched across the water the destruction of the yacht.

This craft that had dared to resist the onset of the brute, to fight against it, to wound it, was feeling the full fury of the monster's rage. The gleaming lights of the doomed ship were waving lines that swept to and fro in the grip of those monstrous arms. The boat beneath Thorpe's feet was tossing in the waves that told of the t.i.tanic struggle. He had meant to look south for some sign of the oncoming destroyer, but in fearful fascination he stared spellbound where the masts of the trim yacht swept downward into the waves, where the green of her star-board lantern glowed faintly for an instant, then vanished, to leave only the darkness and the starlit sea.

A voice aroused him from his stupefaction. "Where am I ... where am I?" Ruth Allaire was asking in a frightened whisper. "That terrible thing--" She shuddered violently as memory returned to show again the horror she had witnessed. "Where are we, Robert? And the _Adelaide_--where is it?"

Thorpe turned slowly. The insane turmoil of the past hour had numbed his brain, stunned him.

"The _Adelaide_--" he mumbled, and groped fumblingly for coherent thoughts. He stared at the girl. She was half-risen from the floor where he had laid her, and the sight of her quivering face brought reason again to his mind. He knelt tenderly beside her and raised her in his arms.

"Where is the yacht?" she repeated. "The _Adelaide_?"

"Gone," Thorpe told her. "Lost!" A thought struck him.

"Was your father on board, Ruth?"

Ruth was dazed.

"Lost," she repeated. "The _Adelaide_--lost!... No," she added in belated response to Thorpe's question. "Daddy was not there. But the men--Captain MacPherson ... that horrible monster...." She buried her face in her hands as she realized what Thorpe's silence meant.

He held the trembling figure close as the girl whispered: "Where are we, Robert? Are we safe?"

"We may win through yet," he told her through grim, set lips. He realized abruptly that he was seeing the face of Ruth Allaire in the light. He had left a lantern burning! He withdrew his arms from about her and sprang quickly to his feet to put out the tell-tale light. In darkness and quiet was their only safety. And he knew as he sprang that he had waited too long. A soft body crashed heavily on the deck outside.

The girl's voice was shrill with terror as she began a question.

Thorpe's hand pressed upon her lips in the dark where he stood waiting--waiting.

A luminous something was glowing outside the cabin. It searched and prodded about the deserted deck to whip upward at the audible hiss of wet carbide. Another appeared; the rifle came slowly to the man's shoulder as a pair of jaws gaped glowingly beyond the windows and an eye stared unblinkingly from its hornlike sheath. It crashed madly against the walls of the wireless room to shatter the gla.s.s and make kindling of the woodwork of the sash. Thorpe fired once and again before the specter vanished, and he knew with sickening certainty that the wounds were only messages to some central brain that would send other ravening tentacles against them. But the oak bars had held.

He reached in the brief interval for the key, and he sent out one final call for help. He strained his ears against the head-set for some friendly human word of hope.

"--rocket," the wireless man was saying. "Fire rockets. We can't find--" A swift, writhing arm wrapped crushingly about the cabin as the message ceased.

Thorpe seized his rifle and fired into the gray ma.s.s that bulged with terrible muscular contractions through the window. He fired again to aim lengthways of the arm and inflict as damaging a wound as his weapon would permit.

The arm relaxed, but a score of others took up the attack. Again the sickening stench was about them as gaping jaws gleamed fiery beneath the hateful eyes and tore at the flimsy structure. Thorpe jammed more cartridges into the gun and fired again and again, then dropped the weapon to fumble for the rockets that Brent had given him.

He lighted one with trembling fingers; the first ball shot straight into a waiting mouth. Another ignited a searing flame of acetlylene gas where a wet arm writhed in the hot carbide trail. The man leaned far out through the broken window.

No time to look around. He let the red flares stream upward high into the air, then dropped the rocket hissing on the deck to seize once more the rifle.

A ma.s.s of muscle crashed against the door; it went to splinters under the impact, and only the two oak bars remained to hold in check the horrible tentacles and the darting heads. One mouth closed to a pointed end that forced its way between the bars. The oak gave under the strain as Robert Thorpe pulled vainly at an empty gun. Beside him rose shrieks of terror as the monstrous thing came on, and Thorpe beat with frantic fury with his clubbed rifle at the fleshy snout.

He knew as he swung the weapon that the shrieks had ceased, then smiled grimly in the numbing horror as he realized that Ruth Allaire was beside him. A piece of oak was in her hands, and she was striking with desperate and silent fury at the slimy flesh.

It was the end, Thorpe knew, and suddenly he was glad. The nightmare was over, and the end was coming with this girl beside him. But Robert Thorpe was fighting on to the last, and he tried to make his blows reach outward to the hateful devilish eye.

He saw it plainly now, for the deck was a glare of white light. He saw the eye and the thick arm behind it and the score of others that made a heaving, knotted ma.s.s were brilliant and wetly shining. He could see now how best to strike, and he turned his gun to thrust with the barrel at the eye.

It withdrew before his stroke--the jaws slid backward to the deck.

There were sounds that hammered at his ears. "The guns! The guns!" a girl was screaming. Across the deck, where a search-light played, huge arms were lashing backward toward the sea. The waves beyond had vanished where a monstrous body shone wetly black in a blinding glare.

And the man hung panting, helpless, on the one remaining bar across the doorway to look where, beyond, her forward guns a spitting stream of staccato flashes, the _Bennington_ tore the waves to high-thrown spray. Her four clean funnels swung far over as the slim ship, with her stabbing, crashing guns, swung in a sweeping circle to bear down upon the black bulk slowly sinking in the search-light's glare.

The vast body had vanished as the destroyer shot like one of her own projectiles over the spot where the beast had lain. And then, where she had pa.s.sed, the sea arose in a heaving mound. The big ship beneath the watching man shuddered again as another depth charge grumbled its challenge to the master of the deeps.