. The American Arbacia and other sea urchins. Sea urchins; Arbacia punctulata; Sea urchins -- Embryos; Biology -- Research. 14. 2 hrs, 10 min 15. 2Va hrs 16. 2 hrs, 50 min. J 20. 7 hrs. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvey, Ethel Browne, b. 1885. Princeton, Princeton University Press

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