. A junior course of practical zoology. Zoology. 16 HYDBA They are capable of free and active movement, and are used for capturing and paralysing the prey, which they then, by their contraction, transfer to the Fig. 12.—Hydra viridis. A small portion of a longitudinal section through the body-wall; x 800. (a. m. m.) A, one of the large ectoderm cells. B, nucleus of a large ectoderm cell. C, muscular tall of a large ectoderm cell. D, an undischarged nematocyst lying within its parent cell, or cnidoblast. E, cnidocil, IP, a nematocyst with discharged thread. G-, Interstitial cell, £[. su
. A junior course of practical zoology. Zoology. 16 HYDBA They are capable of free and active movement, and are used for capturing and paralysing the prey, which they then, by their contraction, transfer to the Fig. 12.—Hydra viridis. A small portion of a longitudinal section through the body-wall; x 800. (a. m. m.) A, one of the large ectoderm cells. B, nucleus of a large ectoderm cell. C, muscular tall of a large ectoderm cell. D, an undischarged nematocyst lying within its parent cell, or cnidoblast. E, cnidocil, IP, a nematocyst with discharged thread. G-, Interstitial cell, £[. supporting lamella. I, endoderm cell. K, vacuole of endoderm cell. L, nucleus of endoderm cell. M, chloro- phyll corpuscle. "N, flagellum of endoderm cell. B. Structure. 1. Structure of the body-wall. Examine the body-wall more closely with the low power, and note its division into layers. a. The ectoderm is the outermost layer of the body. It is colourless, and forms about a third of the entire thickness of the 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 Marshall, A. Milnes (Arthur Milnes), 1852-1893; Hurst, C. Herbert (Charles Herbert), 1856?-1898, joint author. London, Smith, Elder
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1888
