e started down the great trunk, with Wichter following close behind. Walking as rapidly as they could, they hurried back along the tunneled trail toward their shell.

They hadn't covered a hundred yards when they heard a mighty crashing of underbrush behind them. Glancing back, they saw tooth-studded jaws gaping cavernously at the end of a thirty-foot neck—little, dead-looking eyes glaring at them—a hundred-foot body smashing its way over the trap-bushes and through tangles of vines and down-drooping branches.

"The mate to the thing we killed back there!" Joyce panted. "Run, for God's sake!"

Wichter needed no urging. He hadn't an ounce of fear in his spare, small body. But he had an overwhelming desire to get back to Earth and deliver his message. He was trembling as he raced after Joyce, thirty feet to a bound, ducking his head to avoid hitting the thick lavender foliage that roofed the trail.

"One of us must get through!" he panted over and over. "One of us must make it!"

It was speedily apparent that they could never outrun their pursuer. The reaching jaws were only a few yards behind them now.

"You go," called Joyce, sobbing for breath. He slowed his pace deliberately.

"No—you—" Wichter slowed too. In a frenzy, Joyce shoved him along the trail.

"I tell you—"