Along the black silent tunnel Conan groped, momentarily dreading a fall into some unseen pit; but at last his feet struck steps again, and he went up them until he came to a door on which his fumbling fingers found a metal catch. He came out into a dim and lofty room of enormous proportions. Fantastic columns marched around the mottled walls, upholding a ceiling, which, at once translucent and dusky, seemed like a cloudy midnight sky, giving an illusion of impossible height. If any light filtered in from the outside it was curiously altered. In a brooding twilight Conan moved across the bare green floor. The great room was circular, pierced on one side by the great bronze valves of a giant door. Opposite this, on a dais against the wall, up to which led broad curving steps, there stood a throne of copper, and when Conan saw what was coiled on this throne, he retreated hastily, lifting his scimitar. Then, as the thing did not move, he scanned it more closely, and presently mounted the glass steps and stared down at it. It was a gigantic snake, apparently carved in some jade-like substance. Each scale stood out as distinctly as in real life, and the iridescent colors were vividly reproduced. The great wedge-shaped head was half submerged in the folds of its trunk; so neither the eyes nor jaws were visible. Recognition stirred in his mind. This snake was evidently meant to represent one of those grim monsters of the marsh which in past ages had haunted the reedy edges of Vilayet's southern shores. But, like the golden leopard, they had been extinct for hundreds of years. Conan had seen rude images of them, in miniature, among the idol-huts of the Yuetshi, and there was a description of them in the _Book of Skelos_, which drew on prehistoric sources. Conan admired the scaly torso, thick as his thigh and obviously of great length, and he reached out and laid a curious hand on the thing. And as he did so, his heart nearly stopped. An icy chill congealed the blood in his veins and lifted the short hair on his scalp. Under his hand there was not the smooth, brittle surface of glass or metal or stone, but the yielding, fibrous mass of a _living_ thing. He felt cold, sluggish life flowing under his fingers. His hand jerked back in instinctive repulsion. Sword shaking in his grasp, horror and revulsion and fear almost choking him, he backed away and down the glass steps with painful care, glaring in awful fascination at the grisly thing that slumbered on the copper throne. It did not move. He reached the bronze door and tried it, with his heart in his teeth, sweating with fear that he should find himself locked in with that slimy horror. But the valves yielded to his touch, and he glided through and closed them behind him.