. The American Arbacia and other sea urchins. Sea urchins; Arbacia punctulata; Sea urchins -- Embryos; Biology -- Research. 4. 20 hrs 5. 22 hrs 6. 1 day i t # //?? * ^ ^/' f y t /?' W. 7. 2 days 8. 2 days Plate IV. Normal development (living), continued 9. 2 days. 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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