. The American Arbacia and other sea urchins. Sea urchins; Arbacia punctulata; Sea urchins -- Embryos; Biology -- Research. 20. 7 hrs 0 21. 3 hrs 22. 6 hrs 23. 10 hrs 24. 10 hrs Plate XI. Red half, parthenogenetic, development (Parthenogenetic merogone). 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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