. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. C FIGURE 21. Successive stages of sperm entry in Thyone briareus, from sketches of a living specimen. A broad cone with filose projections elevated one moderately slender sleeve about the inmoving acrosome filament. Acrosome filament seen in outer part of cone: solid line. Presumed further course of filament: dotted line. normal eggs. On the other hand, cleavage was never observed in inseminated cul- tures of the stripped eggs. Yet, whichever the source, a number of spermatozoa entered every egg which was observed individual
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. C FIGURE 21. Successive stages of sperm entry in Thyone briareus, from sketches of a living specimen. A broad cone with filose projections elevated one moderately slender sleeve about the inmoving acrosome filament. Acrosome filament seen in outer part of cone: solid line. Presumed further course of filament: dotted line. normal eggs. On the other hand, cleavage was never observed in inseminated cul- tures of the stripped eggs. Yet, whichever the source, a number of spermatozoa entered every egg which was observed individually in slide and coverslip prepara- tions. Generally, the entry was more rapid and the height of the cone less great in the naturally shed eggs. A scheme of the entry process is shown in Figure 20. The spermatozoon does not swim through the thick jelly hull; its first contact with the egg surface is made by means of its acrosome filament. ^Presumably a very early stage would appear as in Figure 20, a. At the earliest stage noted frequently in successful entry, the main body of the spermatozoon had already progressed part way through the jelly and its acrosome filament was already associated with the broad low hyaline 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 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
