. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 228 ALEX B. NOVIKOFF Fusions of Whole Eggs Two eggs are fused at the trefoil stage or at the two-cell stage. The orientation of the two eggs with respect to each other is varied as follows: (1) the animal-vegetal axes of the ova remain parallel, but the eggs are rotated to different degrees; (2) one of the two eggs is inverted so that the fusion occurs at the animal poles or at the vegetal poles of the two eggs, with the rotation of the eggs varied as in (1).. j FIG. 10. Differentiation of larvae arising from fusions of two
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 228 ALEX B. NOVIKOFF Fusions of Whole Eggs Two eggs are fused at the trefoil stage or at the two-cell stage. The orientation of the two eggs with respect to each other is varied as follows: (1) the animal-vegetal axes of the ova remain parallel, but the eggs are rotated to different degrees; (2) one of the two eggs is inverted so that the fusion occurs at the animal poles or at the vegetal poles of the two eggs, with the rotation of the eggs varied as in (1).. j FIG. 10. Differentiation of larvae arising from fusions of two eggs. A. Larva, 23 hours. B. Same larva as shown in A, 52 hours. C. Another larva, 27 hours. />. Another larva, 49 hours, with one internal gut. On the outer surface is an area of ciliated cells, devoid of chromatophores. E. Another larva, 55 hours, with two internal guts. Of the twenty-live fusions effected, 23 larvae are alive at the end of twenty hours of development, and \() at the end of thirty-five hours. Of the 23, 2 larva* show no apical tuft, 7 show one tuft, and 11 sliou two tufts. Among the 19 larva?, the post-trochal bristles fail to form in one case, 4 larva; have one set of bristles, and 14 have two sets; the apical cilia are not visible in 2 larvae, 5 show one group of cilia, and 12 show two distinct groups. In none of the larva? are there more than two apical tufts, or more than (wo sets of post-trochal bristles, or more. 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
