But we must not leave unnoticed one very remarkable Hydroid Acaleph (Fig.) [Please select]
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While Polyps live for many years, and Star-fishes and Sea-urchins require ten or fifteen years to attain their full size, the short existence of the Acaleph, with all its changes, is accomplished in one year. [Please select]
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The color of this pretty Acaleph varies from a greenish hue to green, with a faint tinge of red, or to a reddish brown. [Please select]
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