. The Biological bulletin. Biology; Zoology; Marine biology. CENTRIFUGAL FORCE ON MITOTIC FIGURE 295 .tion, as is indicated by the fact that it bears no relation to the oil cap; it possibly bears a relation to the original polarity of the egg before. Photographs 15-20. Parechinus microtuberculatus 15. Fertilized at 9:40; centrifuged from 10:40-10:44; photograph taken at 11:30. Both primary and induced planes functional; lower cell has no nucleus. 16. Fertilized at 3:10; centrifuged from 3:48-3:52; photograph taken at 4:20. Cleavage in primary plane; amphiaster above in long axis of egg and its
. The Biological bulletin. Biology; Zoology; Marine biology. CENTRIFUGAL FORCE ON MITOTIC FIGURE 295 .tion, as is indicated by the fact that it bears no relation to the oil cap; it possibly bears a relation to the original polarity of the egg before. Photographs 15-20. Parechinus microtuberculatus 15. Fertilized at 9:40; centrifuged from 10:40-10:44; photograph taken at 11:30. Both primary and induced planes functional; lower cell has no nucleus. 16. Fertilized at 3:10; centrifuged from 3:48-3:52; photograph taken at 4:20. Cleavage in primary plane; amphiaster above in long axis of egg and its axis per- pendicular to primary cleavage plane. 17. Same egg at 4:23; new induced cleavage plane, primary plane nearly gone. 18. Same egg at 4:55; induced plane functional. 19. Fertilized at 10:15; centrifuged from 11-11:04, as nuclear wall is breaking; photograph taken at 11:20. Cleavage through oil cap. 20. Fertilized at 10:00; centrifuged from 10:43-10:47; photograph taken at 11:18; lag of cleavage plane at mitochondrial lobe. centrifuging, though this was not determined. This is at variance with the eggs of other species, Paracentrotus, Sphcerechinus, and Arbacia, where the nucleus lies after centrifuging in the clear zone;. 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 Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-; Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report; HighWire Press. Lancaster, Pa. [etc. ] : Lancaster Press, inc. [etc. ]
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectb, booksubjectzoology
