. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIG. 10. Disintegration of normal sand-dollar eggs and embryos, showing re- lative susceptibility of parts. Mesenchymc omitted, a-b, eggs; c, 4-celled; d-f, blastulie; g-j, gastrulte and early larvae. When the polar axis becomes recognizable disintegration proceeds from animal to vegetal pole (i.e. is apico-basal). formation, cell separation, roughening of contour, visible dis- integration, and decolorization, according to the particular agent used, begins at one point of the surface of the egg, or at one pole of the blastom
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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIG. 10. Disintegration of normal sand-dollar eggs and embryos, showing re- lative susceptibility of parts. Mesenchymc omitted, a-b, eggs; c, 4-celled; d-f, blastulie; g-j, gastrulte and early larvae. When the polar axis becomes recognizable disintegration proceeds from animal to vegetal pole (i.e. is apico-basal). formation, cell separation, roughening of contour, visible dis- integration, and decolorization, according to the particular agent used, begins at one point of the surface of the egg, or at one pole of the blastomeres in tin- 2- or 4-cell stage, or at one pole of the cleavage mass or early blastula, and then extends gradually over adjacent parts to reach last the opposite surface or pole. As soon as the blast ul.i differentiates to show the b.is.il thick- ening and begins its elongation, one may orient the embryo in. 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 work.. 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