. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIG. i. Figures showing the extent to which the nucleus (germinal vesicle) of an immature starfish egg may be indented en one or both sides without rupture. On removing the needle the nucleus reverts to its original spherical shape. FIG. 2. a, immature starfish egg cut at 2:45 into three parts; the nucleus has remained intact but is laterally compressed in the middle frag- ment, b, c, d, e and /, successive steps in attempt of nucleus to round up; b, 2:50 ; d, 3:00 ; /, 3:10 FIG. 3. a, partial ru
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIG. i. Figures showing the extent to which the nucleus (germinal vesicle) of an immature starfish egg may be indented en one or both sides without rupture. On removing the needle the nucleus reverts to its original spherical shape. FIG. 2. a, immature starfish egg cut at 2:45 into three parts; the nucleus has remained intact but is laterally compressed in the middle frag- ment, b, c, d, e and /, successive steps in attempt of nucleus to round up; b, 2:50 ; d, 3:00 ; /, 3:10 FIG. 3. a, partial rupture of nucleus followed by a repair of its membrane. b and c, successive changes in the shape of the nucleus within the following ten minutes after which time it disappeared. liquefies. If the rupture of the nucleus be violent, the disintegra- tion of the cytoplasm spreads rapidly until the entire egg is in- volved. If the rupture be slight, the disintegrative process is quickly limited by a surface film which forms on the boundary between the disintegrating and the surrounding healthy cytoplasm (Fig. 4). This film tends to prevent any further spread of the destructive process. The destruction of the cytoplasm is evidently due to something which emanates from the injured nucleus. The injury to the cytoplasm does not start where the nuclear membrane is first torn, but from the entire surface of the injured 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
