. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. * *.'* » W J» * » - * #, * * *" <fc* ' % *'* • % . * % * « .- #* * . « »- 41 « * * »***« * * •»• • :-•/ / * ..» i* *» »*• * * 8 FIGURES 5-8. \rie\vs of one polar surface of the egg pictured in Figures 1-4. The following pairs of photographs were taken within a few seconds of each other : 1 and 5 ; 2 and 6 ; 3 and 7 ; 4 and 8. Figures 1 and 5, cylinder stage. Figures 4 and 8, at the end of furrowing. normal, diastral cleavage. Polyspermy was induced by methods detailed pre- viously (Scott, 1946). RESULTS Cortical stif
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. * *.'* » W J» * » - * #, * * *" <fc* ' % *'* • % . * % * « .- #* * . « »- 41 « * * »***« * * •»• • :-•/ / * ..» i* *» »*• * * 8 FIGURES 5-8. \rie\vs of one polar surface of the egg pictured in Figures 1-4. The following pairs of photographs were taken within a few seconds of each other : 1 and 5 ; 2 and 6 ; 3 and 7 ; 4 and 8. Figures 1 and 5, cylinder stage. Figures 4 and 8, at the end of furrowing. normal, diastral cleavage. Polyspermy was induced by methods detailed pre- viously (Scott, 1946). RESULTS Cortical stiffness indicated h\< granule patterns The movements of the echinochrome granules are as follows : ( 1 ) In the unfer- tilized egg they are scattered throughout the cytoplasm ; within seven minutes after fertilization at 20° C. most of them have migrated to, and become fixed in, the cortex. (2) The individual granules when observed with oil immersion are seen to undergo a slow random migration within the cortex up until the moment of cell. 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
