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  • I also compared the succession of this type in time with the growth of its present representatives in their embryonic condition, and carried out this illustration especially for the Crinoids; showing that in its successive transformations the Comatula passes through stages which, from their resemblance to the full grown Crinoids of earlier ages, I designated as the Cistidian, the Pentremitian, the Platycrinian, the Pentacrinian, and the Comatuline stages of growth.

    --Louis Agassiz, 1869, Annual Report of the Trustees of the Museum of Comparative Zoology for 1868, p. 9

    June 19, 2010