Oliver Lane lay sick with horror. The weight upon his chest grew unbearable, and the desire to cast it off stronger minute by minute, as he lay motionless, with his oppressor quite invisible now.

Panton was in the berth above him, Drew upon the other side of the cabin, and along the beams there were guns and rifles hanging ready for use, while a faintly heard tread overhead told him that the watch was on the alert. But though help and means of defence were so near and ready, they seemed to be too far-off to avail him much, and hence he still did not stir.

Twenty or thirty feet he felt the creature must be, and of enormous thickness. They could not, then, be upon an isle, he thought, for such a creature must be an inhabitant of the mainland. But what could he do, with the weight increasing now? He could not possibly bear it much longer, for the reptile must be far longer than he had first imagined—forty feet at least.

At last, after vainly hoping that the serpent might grow restless and leave him, he felt that he must make some effort, and determined to call to his comrades for help.

But he hesitated, for what would be the consequences? The monster would be aroused by the noise and the first movement he made; and if it did not attack him, it would seize Drew or Panton, who would wake up in complete ignorance of the danger at hand. They could not use their guns there, in the narrow cabin, and the serpent would be master of the field.

No; he dare not call for them to help him, nor speak till some one came into the cabin, for in all probability Mr Rimmer was on deck and would come down soon.

A hundred wild thoughts flocked through Oliver Lane’s brain, as he lay there half-suffocated, and felt how hard it was to have escaped from the terrible dangers of the volcanic eruption to find his end in the embrace of a loathsome serpent.

At last his mind was made up to what seemed to be the only way of escape. He determined to try and collect his energies, and then, after drawing a long deep breath, suddenly heave the monster off him on to the cabin floor. This he knew—if he were successful—would enrage it, but at the same time it might make for the companion-way and escape on to the deck—to attack the watch!

He hesitated at this for a few moments, but self-preservation is the first law of nature, and the watch would hear the alarm and be able to ascend the rigging, out of the creature’s reach.

“I must do it,” thought Oliver, “before I become too weak, for he’s sixty feet long if an inch,” and beginning softly to draw in a deep breath, he felt, to his horror, a slight gliding motion on the part of the reptile, as if the heaving up were making it uncomfortable.