opening before us like the gate of hell. A mouth, nothing more. It yawned in front of us—

Then advanced.

I felt noxious vapors shoot out, bathing my thermosuit, and I saw a gargling larynx feet across. I fired, again and again, into the monster's throat.

My companions were firing too. We seemed to have halted the thing's advance. It paused some twenty feet from us, a wall of mouth.

Then it disappeared.

It blinked out of sight the way it had come—instantaneously. For a moment I didn't realize what had happened, and fired three useless charges into the space where the monster had been.

"It's gone," Hamner exclaimed.

My hands were trembling—me, who had stood up to Venusian mudworms without a whimper, who had fought the giant fleas of Rigel IX. I was shaking all over. Sweat was running down my entire body, and the wiper of my faceplate was going crazy trying to blot my forehead.

Then I heard dull groans coming from up ahead. One final grunt, then silence. They had been coming from Max Feld.

Looking around cautiously, I rose to my feet. There was no sign of the creature. I ran to where Max lay.

The plump paleontologist was sprawled flat in the sand, face down. I bent, yanked him over, peered in his facemask. His eyes were open, staring—and lifeless.

It wasn't till we got back to the ship that we could open his spacesuit and confirm what I thought I saw on his face.

Doc Graves pronounced it finally: "He's dead. Heart attack. What the devil did you see out there, anyway?"

Quickly I described it. When I was finished the medic shivered. "Lord! No wonder Max had an attack. What a nightmare!"

Donaldson, the anthropologist, appeared from somewhere in the back of the ship. Seeing Max's body, he said, "What happened?"

"We were attacked on the desert. Max was the only casualty. The thing didn't touch us—it just stood there and changed shape. Max must have died of fright."

Donaldson scowled. He was a wry, taciturn individual with a coldness about him that I 

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