. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 112 N. M. STEVENS. nature, and the members of the pair are in about the position which they assume in the spindle. Throughout the growth stage the composite pair of chromosomes is found, more or less condensed, but always distinguishable from the remainder of the chromatin—against the nuclear membrane, twisted or coiled or. 20 FIGS. 14—17. Anopheles punctipennis, first spermatocyte metaphase. X=the unequal pair. FIG. 18. Anaphase. FIGS. 19 and 20. Culex pipiens, first spermatocyte metaphase and anaphase. FIG. 21. Anopheles p
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 112 N. M. STEVENS. nature, and the members of the pair are in about the position which they assume in the spindle. Throughout the growth stage the composite pair of chromosomes is found, more or less condensed, but always distinguishable from the remainder of the chromatin—against the nuclear membrane, twisted or coiled or. 20 FIGS. 14—17. Anopheles punctipennis, first spermatocyte metaphase. X=the unequal pair. FIG. 18. Anaphase. FIGS. 19 and 20. Culex pipiens, first spermatocyte metaphase and anaphase. FIG. 21. Anopheles punctipennis, second spermatocyte metaphase. FIG. 22. Spermatid nuclei. All figures same magnification—2,000. knotted into such shapes that it is usually impossible to dis- tinguish the equal and unequal pairs of which it is composed. Prophase stages are evidently much briefer than in Culex, for it was difficult to find any clear figures—Fig. 13 shows the composite heterochromosome pair (x) and the other two chro- mosomes not yet separated into their parallel 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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