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“But the fish called the nautilus,” says Aristotle, “is not a polypus, though it resembles a polypus in its feelers. And the back of the nautilus is covered with a shell; and it rises up out of the bottom of the sea, having its shell upon its back, in order that it may not catch the water. But when it has turned round, then it sails on, putting up two of its feelers, which have a thin membrane growing between them, just as the feet of some birds are which have a membrane of skin between their toes. And their other two feelers they let down into the sea, instead of rudders; but when they see anything coming towards them, then out of fear they draw in those feet, and fill themselves with salt water, and so descend to the bottom as rapidly as possible.” But, in his treatise on Animals and Fishes, he says—“Of the polypi there are two sorts; one, that which changes its colour, the other the nautilus.”
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