. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 276 ALLAN SCOT I this type of cleavage is the bridge-like stalk which results (Figs. 23 and 24). In these latter figures note that one circumferential furrow deepened symmetrically and more rapidly than the other. The furrow which started later is very asym- metrical, being much deeper on one side (cf., at the arrow) than the other. Egg^ cleaving to three cells show a similar behavior (Fig. 22) and when cleavage is com-. FIGURE 13. in sea water. Series showing late cleavage and development of the cleavage stalk at 10° C. ple
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 276 ALLAN SCOT I this type of cleavage is the bridge-like stalk which results (Figs. 23 and 24). In these latter figures note that one circumferential furrow deepened symmetrically and more rapidly than the other. The furrow which started later is very asym- metrical, being much deeper on one side (cf., at the arrow) than the other. Egg^ cleaving to three cells show a similar behavior (Fig. 22) and when cleavage is com-. FIGURE 13. in sea water. Series showing late cleavage and development of the cleavage stalk at 10° C. plete they may have a Y-shaped stalk, or if one furrow deepens more rapidly than the others, two stalks may connect to one blastomere (Figs. 9 and 10). The speed of furrowing in polyspermic eggs cleaving to four cells may be as rapid as when two cells are being formed, yet it should be remembered that the amount of new surface formed is much greater when a sphere divides into four equal smaller spheres. The surface of a sphere divided into two spheres increases 26 per cent,. 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
