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Page 21 - Scombrida, of the exact color of the deathdealing tentacles, that live under and among them, a wonderful case of mimicry.* Allied to the Physalia are the Porpita and Velella. The latter also floats upon the surface, a raft bearing a silvery sail, while beneath is the same rich coloring of the Physalia. Works on Hydroids for further reference. " Acalephs (Jelly-Fishes) of North America, with Pictures of most of the Species in Catalogue of Museum of Comparative Zoology," by A. Agassiz ; L. Agassiz,...