swimbladder

• Whereas on the original prototype, Fantasy, they had been forced to dispense with a full complement of armament, in this regard the Ironduke was a high-powered arsenal. —  Spoor of the Antis
• There was no tracking device that could trace its position. —  Spoor of the Antis
• It moved in a kind of buffer zone between dimensions, which the converter invented by Dr. Kalup served to generate. —  Spoor of the Antis
• The roots of fallen trees towered above the moist morass. —  Spoor of the Antis
• All physiologists admit that the swimbladder is homologous, or "ideally similar" in position and structure with the lungs of the higher vertebrate animals: hence there seems to me to be no great difficulty in believing that natural selection has actually converted a swimbladder into a lung, or organ used exclusively for respiration I can, indeed, hardly doubt that all vertebrate animals having true lungs have descended by ordinary generation from an ancient prototype, of which we know nothing, furnished with a floating apparatus or swimbladder. —  On the Origin of Species by Means of Natural Selection or the Preservation of Favoured Races in the Struggle for Life. (2nd edition)

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