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Hydra, enlarged approx. 30 times, in SOMSO-Plast.
After Christian Gro , Head of Biology Department (retired). The anatomy of the hydra is shown in longitudinal section: entoderm, mesoglea, ectoderm, male and female egg-cells, buds and mouth opening. A detailed block of the wall of the body in the region of stomach and intestine, enlarged approx. 200 times, clearly shows the microscopic structure in cross and longitudinal section, and especially the structure of the various types of cell (nematoblasts, musculo-epithelial cells, sense cells, interstitial cells and the nerve network). In one piece. On a green base with explanatory notes.