. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIG. 12. Protenar belfragei. Chromosome-groups of embryonic cells, a and b, 13-chromosome type, from the same embryo, c, i4-chromosome type, from another embryo. to those of the spermatogonia, the 14-chromosome group, to those of the oogonia. Though the results are too few to justify broad conclusions, it is most probable that the embryo with 13 chromosomes is a male, the one with 14 chromosomes a female, thus bringing Protenor in line with Archimerus, Anasa and Chelinidea. IV. SUMMARY AND CONCLUSION. Among the results descr
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FIG. 12. Protenar belfragei. Chromosome-groups of embryonic cells, a and b, 13-chromosome type, from the same embryo, c, i4-chromosome type, from another embryo. to those of the spermatogonia, the 14-chromosome group, to those of the oogonia. Though the results are too few to justify broad conclusions, it is most probable that the embryo with 13 chromosomes is a male, the one with 14 chromosomes a female, thus bringing Protenor in line with Archimerus, Anasa and Chelinidea. IV. SUMMARY AND CONCLUSION. Among the results described in this paper,14 those of particular interest are as follows: 1. In Archimerus, Anasa and Protenor there is an odd or un- paired chromosome in the spermatogonia which in Protenor is distinguishable by its size. The oogonia contain in addition to this chromosome, a second chromosome of the same size. These observations are in agreement with those of Wilson, Montgomery and of Lefevre and McGill for the forms mentioned. 2. The chromosomes in the reduced female groups (polar or oocyte divisions) show the same relative size differences as the corresponding pairs in the oogonia (particularly well shown in Protenor). 3. All the chromosomes divide in both polar divisions (proof J<A preliminary note giving the most important results was published in Science for December 31, 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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