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Updated: May 23, 2025
With regard to organisms, however, the wonderful Acanthometræ and the Polycystina may be mentioned as presenting complexities of form which can hardly be thought to be due to other than internal causes. The same may be said of the great group of Echinoderms, with their amazing variety of component parts.
Then on the foraminifera, which secretes a shell of lime from the water. Then on a step higher to the polycystina, which secretes a shell, or skeleton of flint-like material from the water. Then come the sponges. Then the coral-animals, anemones and jelly-fish. Then come the sea-lilies, star-fish, etc. Then the various families of worms. Then the crabs, spiders, centipedes, insects.
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