. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ii 9 10 FIG. 9. Two minutes after insemination. Membrane is fully rounded, equidis- tant at all points from the now spherical egg. FIG. 10. About same time as in Fig. 9. Cone is clearly visible. FIG. ii. Ten minutes after insemination. Egg with hyaline plasma layer formed those farther removed may become attached, lashing back and forth very vigorously. The heads of those still farther away but not far enough beyond the area of decrement actually to be engulfed are likewise affixed and present a swollen appearance. When the
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ii 9 10 FIG. 9. Two minutes after insemination. Membrane is fully rounded, equidis- tant at all points from the now spherical egg. FIG. 10. About same time as in Fig. 9. Cone is clearly visible. FIG. ii. Ten minutes after insemination. Egg with hyaline plasma layer formed those farther removed may become attached, lashing back and forth very vigorously. The heads of those still farther away but not far enough beyond the area of decrement actually to be engulfed are likewise affixed and present a swollen appearance. When the membrane lifts off these affixed sperm are carried with it. The Echinarachnius egg, then, would seem to be unusual, since a gradient of susceptibility to the sperm may actually be demon- strated in the cortical changes following sperm entry. After elevation of the membrane in Echinarachnius egg a cone (Fig. 10) of clear cytoplasm forms at the point of sperm entry; sectioned eggs show the sperm within where rotation of the head may begin. This cone1 disappears; within some ten to fifteen 1 The cone and the behavior of sperm that are attached to the cortex but do not enter constitute important checks on the observation of the point of sperm 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
Size: 1581px × 1581px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
