. The American Arbacia and other sea urchins. Sea urchins; Arbacia punctulata; Sea urchins -- Embryos; Biology -- Research. 5. Unfertilized 6. 10 min 7. 20 min 13. 8 hrs. 14. 11 hrs 15. 20 hrs. 17. 3 hrs mu. 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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Keywords: ., bookcentury1900, bookpublisherprincetonprincetonuniversitypress