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Chapter Xx. Echinodermata.

The Works of Francis Maitland Balfour, Volume 2 (of 4) · Francis M. Balfour — chapter 4 of 27 · ~22 words · public domain

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Development of the germinal layers, pp. 544-553. Development of the larval appendages and metamorphosis, pp. 553-573. Summary and general considerations, pp. 573-576.

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The Works of Francis Maitland Balfour, Volume 2 (of 4) · The Wunder Library — complete classics, free to read, with narration.

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