River. But it's small and hard to find. We call it 'The Deep Hole.' And there's another in the Antarctic Sea."
The Doctor: "Can you talk any shellfish language yourself?"
The Fidgit: "No, not a word. We regular fishes don't have anything to do with the shellfish. We consider them a low class."
The Doctor: "But when you're near them, can you hear the sound they make talking—I mean without necessarily understanding what they say?"
The Fidgit: "Only with the very largest ones. Shellfish have such weak small voices it is almost impossible for any but their own kind to hear them. But with the bigger ones it is different. They make a sad, booming noise, rather like an iron pipe being knocked with a stone—only not nearly so loud of course."
The Doctor: "I am most anxious to get down to the bottom of the sea—to study many things. But we land animals, as you no doubt know, are unable to breathe under water. Have you any ideas that might help me?"
The Fidgit: "I think that for both your difficulties the best thing for you to do would be to try and get hold of the Great Glass Sea Snail."
The Doctor: "Er—who, or what, is the Great Glass Sea Snail?"
The Fidgit: "He is an enormous salt-water snail,
