“Work yourself out! I did!” yelled Dick. “Can’t fire! Got no revolver! I won’t desert you, though! I’ll follow on!”

The Plesiosaurus had now disappeared down the trail.

It went sliding down over the slippery rocks, and now the boys were able to understand what made it so smooth. Probably this had been the monster’s path for years.

“Oh, it’s terrible! Terrible!” cried Clara. “Oh, Dick! Can nothing be done to save that man?”

“There’s his rifle now, standing against the hut!” cried Charley. “Why didn’t we think of it before?”

Dick made a rush for the rifle, and sprang to the head of the trail.

“It will do no good, anyhow, but here goes!” he cried.

He fired, but with no result, just as he had anticipated.

The bullet struck the monster on its scaly back and glanced off as if it had been fired against boiler plate.

Down the steep slope the Plesiosaurus went sliding.