. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. HYDRA KMBRYOGENESIS 353. Figure 19. Early cuticle stage. Cuticular material (arrows) is deposited on the apical surfaces of the cells and around filopodia that project from the outer cells. Bar = 10 ^m. Figure 20. Hydra embryo with fully developed cuticle. The cuticle is adorned with thick spines (ar- rows). Bar = 100 jim. Figure 21. Cross-section of a cuticulated embryo. A thick cuticle is tightly attached to an outer thin layer of squamous cells (not visible here). The interior of the embryo contains spherical cells rich i
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. HYDRA KMBRYOGENESIS 353. Figure 19. Early cuticle stage. Cuticular material (arrows) is deposited on the apical surfaces of the cells and around filopodia that project from the outer cells. Bar = 10 ^m. Figure 20. Hydra embryo with fully developed cuticle. The cuticle is adorned with thick spines (ar- rows). Bar = 100 jim. Figure 21. Cross-section of a cuticulated embryo. A thick cuticle is tightly attached to an outer thin layer of squamous cells (not visible here). The interior of the embryo contains spherical cells rich in nurse cells (arrows). Bar = 100 ^m. Figure 22. Enlargement of cuticle spines (S) and nurse cells (arrows) of a cuticulated embryo. Bar = this stage the outer layer becomes morphologically sim- ilar to the epithelium of the adult ectoderm. The second event is the appearance of interstitial cells. All nonepithelial cells in hydra are part of the interstitial cell lineage. It consists of a population of interstitial cells, some of which are multipotent stem cells, and four classes of differentiation products: neurons, nemato- cytes, secretory cells, and gametes (Bode, 1996). During. 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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