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Updated: May 12, 2025
Here is situated a complicated net-work of vessels, and the fluids of the body are thus exposed to the influence of oxygen, and receive the needed aeration. The stroke of the disk, therefore, is not only a locomotive, but also a respiratory act. The jelly-fishes of this section move as they breathe, and breathe as they move. Hence the name which has been given them Pulmonigrades.
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