. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIGURE 2. Unfertilized egg and early embryos. Scale, 20 /urn. A. Unfertilized egg in the sea water containing India ink to show the jelly coat. Arrowhead indicates the region where spindle of the first meiotic metaphase is situated. Lateral view. B. Fertilized egg surrounded by the fertilization membrane (FM) and hyaline layer (HL). Swelling of the hyaline layer at the animal pole (arrowhead) is the elimination site of the first polar body. Lateral view. C. High magnification of the animal polar region of the fertilized egg,
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIGURE 2. Unfertilized egg and early embryos. Scale, 20 /urn. A. Unfertilized egg in the sea water containing India ink to show the jelly coat. Arrowhead indicates the region where spindle of the first meiotic metaphase is situated. Lateral view. B. Fertilized egg surrounded by the fertilization membrane (FM) and hyaline layer (HL). Swelling of the hyaline layer at the animal pole (arrowhead) is the elimination site of the first polar body. Lateral view. C. High magnification of the animal polar region of the fertilized egg, showing the first and second polar bodies (arrowhead). D. Two-cell stage embryo. Lateral view. E. Regular four-cell stage embryo. Animal polar view. F. Irregular four-cell stage embryo. Animal polar view. Note the irregular arrangement of the blastomeres. G. Regular eight-cell stage embryo. Lateral view. H. Irregular eight-cell stage embryo. Lateral view. I. Blastula having a narrow blastocoel (BC). J. Swimming blastula. Primary mesenchyme (P) migrates to the blastocoel. The hyaline layer is thickest at the posterior pole (arrowhead). K. Swimming blastula slightly compressed to show vacuoles in the animal polar wall (arrowheads). Primary mesenchyme has occupied almost the whole cavity of the blastocoel. L. Gastrula. Arrowhead indicates the archenteron. 134. 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
