Yet, beholding the terrific size and power of the tiger of the air, it seemed impossible that any agency of man might cope with it. That it meant an attack was obvious; for while Dick was disposing his little force it had been circling, perhaps two hundred yards above, choosing the point for the onslaught.

Now it rushed down; not at Dick, but from the opposite quarter. All ran in that direction. The pteranodon rose, sounding its raucous croak as if in mockery. Before they had regained their position, it had whirled, and was plunging with the speed of an express train down the aerial slope directly upon Dick. Straight for his heart aimed the great bayonet that the creature carried for a bill.

Dick stood braced. The heavy, loaded club swung high. The creature was almost upon him when he leaped to one side, and brought his weapon around. The next instant he lay stunned and bleeding from the impact of the piston-rod wing.

The reptile swerved slightly. Shouting aloud, Professor Ravenden poured the six bullets from his revolver into the great body. From the other side Johnston was shooting. The monster was apparently unaffected, for it skimmed along toward the spot where the girls crouched, guarded by Everard Colton, who held ready a small boulder, his only weapon.

But between stood “The Wonderful Whalley” with knife poised. On came the reptile. Like a bow, the little juggler bent backward until his knife almost touched the ground behind him. Then it swung, flashed, and went home as the pteranodon, with a foot of steel driven into its hideous neck, pierced the man through and through, and rising, shook the limp body from its beak.

The air was poisoned with the reek of the great saurian. Sharp to the left it turned, made a halfcircle and, beating the air with the thunderstrokes of sails flapping loose in a mighty wind, fell to the ground ten paces from Professor Ravenden.

Instantly that intrepid scientist was upon it, with clubbed revolver, everything forgot except the hope of capturing such a prize. Everard, holding aloft his rock, sprinted to the rescue. Dick staggered after him. They had almost reached the spot when the reptile’s dying agony began.

The first wing-beat hurled Professor Ravenden headlong with a broken collar-bone. Frenzied and unseeing, the monster of the dead centuries projected itself from the hill, and with one dreadful scream that might have rung from the agonised depths of hades, sped out across the waters. Once, twice, thrice, and again, the vast pinions beat; then a plunge, a whirl, a wild maelstrom of foam far out at sea—and quiet.

Dolly Ravenden, with a cry, ran to her father, and with the help of Dick and old Johnston got him to his feet.

“A boat! A boat!” he cried. “We must pursue it!”