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Smooth round masses Moeandrina and Astroea were contrasted with delicate leaf-like and cup-shaped expansions of Explanaria, and with an infinite variety of Madreporiæ and Seriatoporæ, some with more finger-shaped projections, others with large branching stems, and others again exhibiting an elegant assemblage of interlacing twigs, of the most delicate and exquisite workmanship.
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