. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. THE SPERMATOGEXESIS OF A DAPHXID. 137 The principal stages in the spermatocytic development of Simocephalus are indicated in Fig. 3. A resting spermato- gonium is shown in Fig. 3, a. The spermatogonial chromosomes appear to be slender more or less U-shaped rods. During metaphase (Fig. 3, b), they are too closely massed to be counted. I have no doubt, however, that they are considerably more than eight in number. Nuclei in synizesis (Fig. 3, c} show a decided. FIG. 3. contraction of the chromatin threads. No growth occurs dur
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. THE SPERMATOGEXESIS OF A DAPHXID. 137 The principal stages in the spermatocytic development of Simocephalus are indicated in Fig. 3. A resting spermato- gonium is shown in Fig. 3, a. The spermatogonial chromosomes appear to be slender more or less U-shaped rods. During metaphase (Fig. 3, b), they are too closely massed to be counted. I have no doubt, however, that they are considerably more than eight in number. Nuclei in synizesis (Fig. 3, c} show a decided. FIG. 3. contraction of the chromatin threads. No growth occurs during this stage and no nucleolus is discernible. Intheprophase of the primary spermatocyte (Fig. 3, d), eight distinctly double rod-like chromosomes are evident. The chromosomes in this stage are very distinct being more or less regularly distributed just under the nuclear membrane and in over fifty cases counted the double chromosomes were constantly eight 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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