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It has been shown in the chapter on Keeling atoll that there are some species of large fish, and the whole tribe of Holothuriae which prey on the tenderer parts of the corals. On the other hand, the polypifers in their turn must prey on some other organic beings; the decrease of which from any cause would cause a proportionate destruction of the living coral.
Innumerable crustacea frequent every part of the plant. On shaking the great entangled roots, a pile of small fish, shells, cuttlefish, crabs of all orders, sea-eggs, starfish, beautiful Holothuriae, Planariae, and crawling nereidous animals of a multitude of forms, all fall out together. Often as I recurred to a branch of the kelp, I never failed to discover animals of new and curious structures.
All possible gradations, as he adds, may likewise be found between the pedicellariae of the star-fishes and the hooks of the Ophiurians, another group of the Echinodermata; and again between the pedicellariae of sea-urchins and the anchors of the Holothuriae, also belonging to the same great class.
But as these holothuriae are generally found in the vicinity of the coral banks of Polynesia, to the eastward of New Guinea, and not in the direction of the Australian coast, there is much reason to think that the Chinese claim to the discovery of this continent is purely mythical, although, like the ancients, they may have believed in its existence as a logical deduction of philosophy.
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