. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 352 V. J. MARTIN KT . Figure 15. Cross-section ot'a hydra hlastula showing cells (arrows) ingressing into the hlastocoel from all sides. Bar = 100 ^m. Figure 16. Cells ingressing into the hlastocoel during gastrulation (enlargement ofFig. 15). Individual cells extending filopodia (arrows) detach from their neighbors, move into the blaslocoel. and fill it. Bar = 100 ^m. Figure 17. Cross-section of a control hydra gastrula. The outer layer of cells (E) will give rise to the epidermis of the adult polyp, while some of the c
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 352 V. J. MARTIN KT . Figure 15. Cross-section ot'a hydra hlastula showing cells (arrows) ingressing into the hlastocoel from all sides. Bar = 100 ^m. Figure 16. Cells ingressing into the hlastocoel during gastrulation (enlargement ofFig. 15). Individual cells extending filopodia (arrows) detach from their neighbors, move into the blaslocoel. and fill it. Bar = 100 ^m. Figure 17. Cross-section of a control hydra gastrula. The outer layer of cells (E) will give rise to the epidermis of the adult polyp, while some of the cells of the inner mass (EN) will contribute to the gastro- dermis of the adult. Nurse cells (arrows) are abundant in the inner layer of cells. Bar = 100 jim. Figure 18. Cross-section of a control gastrula. Note the outer layer of columnar-shaped cells (E) that surround the central spherical cells (EN). A mesoglea is not detected between the outer and inner cells. Bar = 10 jim. of blastomeres of the gastrula and early cuticle rge and amorphous. By 6 days postfertiliza- tion i i. after cuticle formation is complete, some of the cells are much smaller and have nuclei that resem- ble those of the epithelial cells of adults. They have a prominent nucleolus and a clear cytoplasm. Thus, by. 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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