Bulletin of the Museum of Comparative Zoology at Harvard College . n capsule is due to the presence ofmuscle fibres and connective tissue. The boundary line betweenamnion and serosa is visible only in the vicinity of the amnioticnuclei. , epithelium of ovarian capsule (when the plates wereengraved I still took this to be the follicular epithelium, hence theerror in the abbreviation); n/./o/., nucleus of capsular epithelium;nl. sr., nucleus of serosa; nl. am., nucleus of amnion. X 630. Figs. 3-15 are all from the serosa. Fig. 3. Very small, binucleate cell. X 130. Figs. 4-10. Nuclei at d
Bulletin of the Museum of Comparative Zoology at Harvard College . n capsule is due to the presence ofmuscle fibres and connective tissue. The boundary line betweenamnion and serosa is visible only in the vicinity of the amnioticnuclei. , epithelium of ovarian capsule (when the plates wereengraved I still took this to be the follicular epithelium, hence theerror in the abbreviation); n/./o/., nucleus of capsular epithelium;nl. sr., nucleus of serosa; nl. am., nucleus of amnion. X 630. Figs. 3-15 are all from the serosa. Fig. 3. Very small, binucleate cell. X 130. Figs. 4-10. Nuclei at different stages of division, vac, vacuole; x, new nuclearwall within the old one. X 550. Fig. 11. Two cells produced by division of a binucleate cell. X 130. Fig. 12. Cell from the serosa of a j^oung embryo, with dividing nucleus ; the axisof elongation corresponds with the short axis of the cell. X 130. Fig. 13. Cell from serosa of a young embryo, with nucleus unequally divided anddaughter nuclei eccentric in position. X 130. loiiNsoN m -^TT (??. •^=^^^^ 10. /^-. Johnson. — Nuclear Division. PLATE II. Fig. 14. Piece of the serosa from an advanced embryo, with four adjacent tri-nucleate cells (1, 2, 3, 4) ; nuclei of cell a and the large cell farthestto left have undergone degeneration. X 90. Fig. 15. Three cells of the serosa from an old embryo to show recession of daugh-ter nuclei towards the ends of tiie cells. X 90. Figs. 16-20 are from the amnion. Figs. 16-19. Stages in the division of amniotic nuclei. In Figure 18 three stagesare shown, a, b, c. X 800. Fig. 20. Two amniotic cells, apparently formed by recent division. X 375. Figs. 21-26 are from the capsular epithelium. Figs. 21-23. Cells showing successive stages of nuclear division. X 800. Figs. 24-26. Cells to show the degeneration of nuclei. In Figure 24 the but slightly differentiated, in Figure 25 the pale nucleus hasbecome much larger and very faint, in F
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