. The American Arbacia and other sea urchins. Sea urchins; Arbacia punctulata; Sea urchins -- Embryos; Biology -- Research. 5. Unfertilized 6. 1 0 min 7. 1 hr 8. 1 !4 hrs. 9. 21/2 hrs 10. 3 hrs 11. 41/2 hrs 12. 5 hrs n 13. 27 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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Keywords: ., bookcentury1900, bookpublisherprincetonprincetonuniversitypress