. Elementary textbook of economic zoology and entomology. Zoology; Insect pests. 22 ECONOMIC ZOOLOGY AND ENTOMOLOGY thrown out through the mouth opening. The digestive cavity extends out into the tentacles. In a prepared cross-section, the body of Hydra is seen to be a hollow cylinder with walls made up of two well-defined layers of cells with a thin non-cellular layer between them. Some of the cells of the outer layer, or ectoderm, have contractile basal processes running parallel to the long axis of the "W^33^ ^ } / ./ £ „*' ^"^v / ^" ^$&~. Please note that these im
. Elementary textbook of economic zoology and entomology. Zoology; Insect pests. 22 ECONOMIC ZOOLOGY AND ENTOMOLOGY thrown out through the mouth opening. The digestive cavity extends out into the tentacles. In a prepared cross-section, the body of Hydra is seen to be a hollow cylinder with walls made up of two well-defined layers of cells with a thin non-cellular layer between them. Some of the cells of the outer layer, or ectoderm, have contractile basal processes running parallel to the long axis of the "W^33^ ^ } / ./ £ „*' ^"^v / ^" ^$&~. 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 Kellogg, Vernon L. (Vernon Lyman), 1867-1937; Doane, Rennie Wilbur, 1871-. New York, H. Holt and company
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