Abstract
MAY I ask your permission for a short space in which to reply to Dr. Mortensen's letter published in NATURE of December 16, p. 806, under the title “Echinoderm Larvæ and their bearing on Classification.” The points which Dr. Mortensen raises are two—namely (a) whether the Echinoderm metamorphosis is a metagenesis, i.e. an alternation of generations, or not, and (b) whether the fixed stage in the life-history of Asteroidea is a reminiscence of an ancestral condition or a secondary modification of development. I shall deal with the second point first. Dr. Mortensen states:
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MACBRIDE, E. Echinoderm Larvæ and their Bearing on Classification. Nature 111, 47 (1923). https://doi.org/10.1038/111047a0
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DOI: https://doi.org/10.1038/111047a0
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