In the plate could be plainly seen the hind quarters of the sheep held in the grasp of such a monster as even the drug-laden brain of an opium smoker never pictured. Judging from the sheep, the monster stood about twenty feet tall, and its frame was surmounted by a head resembling an overgrown frog. Enormous jaws were opened to seize the sheep but, to the amazement of the three observers, the jaws were entirely toothless. Where teeth were to be expected, long parallel ridges of what looked like bare bone, appeared, without even a rudimentary segregation into teeth. The body of the monster was long and snakelike, and was borne on long, heavy legs ending in feet with three long toes, armed with vicious claws. The crowning horror of the creature was its forelegs. There were of enormous length, thin and attenuated looking, and ended in huge misshapen hands, knobby and blotched, which grasped the sheep in the same manner as human hands. The eyes were as large as dinner plates, and they were glaring at the camera with an expression of fiendish malevolence which made Carnes shudder. "How does that huge thing ever get through that crack we examined?" demanded the lieutenant. Dr. Bird rubbed his head thoughtfully. "It's not an amphibian," he muttered, "as is plainly shown by the shape of the limbs and the lack of a tail, and yet it appears to have scales of the true fish type. It corresponds to no recovered fossil, and I am inclined to believe it is unique. The nervous organisation must be very low, judging from the lack of forehead and the general conformation. It has enormous strength, and yet the arms look feeble." "It can't get through that crack," insisted the lieutenant. "Apparently not," replied the doctor. "Wait a moment, though. Look at this!" He pointed to the great disproportion between the length and diameter of the forelegs, and then to the hind legs. "Either this is grave distortion or there is something mighty queer about that conformation. No animal could be constructed like that." * * * * * He turned the film so that an oblique light fell on it. As he did so he gave a cry of astonishment. "Look here!" he said sharply. "It does get through that crack! Look at those arms and hands! There is the answer. This creature is tall and broad, but from front to rear it can measure only a few inches. The same must be true of the froglike head. That animal has been developed to live and move in a low roofed cavern, and to pass through openings only a few inches wide. Its bulk is all in two dimensions!" "I believe you're right," said Carnes as he studied the film. "There is no doubt of it," answered the doctor. "Look at those paws, too, Carnes. That substance isn't bone, it's gum. The thing is so young and helpless that it hasn't cut its teeth yet. It must be a baby, and that is the reason why it made its way into the cave when no other of its kind ever has."