. Animal biology. Zoology; Biology. HYDRA 135 they are spermaries, or testes; if they are more knoblike and are situated nearer the base they are ovaries (Fig. 55). 161. Internal Structure.—When studied by means of sections (Fig. 55) in which the structure is brought out by appropriate staining, the hydra is seen to bo made up of a body wall surrounding a large central. Cuficl& Fig. 55.—Somewhat diagrammatic longitudinal section of a hydra, showing two buds differing in age on the left, and a spermary and ovary on the right. Batteries of nemato- cysts are to be observed on the tentacles. I
. Animal biology. Zoology; Biology. HYDRA 135 they are spermaries, or testes; if they are more knoblike and are situated nearer the base they are ovaries (Fig. 55). 161. Internal Structure.—When studied by means of sections (Fig. 55) in which the structure is brought out by appropriate staining, the hydra is seen to bo made up of a body wall surrounding a large central. Cuficl& Fig. 55.—Somewhat diagrammatic longitudinal section of a hydra, showing two buds differing in age on the left, and a spermary and ovary on the right. Batteries of nemato- cysts are to be observed on the tentacles. In the gastrovascular cavity the entoderm is seen to be made up of flagellated cells, cells bearing pseudopodia, and gland cells. A deli- cate cuticle covers the ectodermal layer. cavity known as the gasirovascular cavity, or enteron, which opens to the outside through the mouth. The gastrovascular cavity also extends outward into each tentacle, reaching nearly to the tip, though the canal so formed is very narrow. The wall of the body and that of the tentacles is composed of two layers of cells separated by an extremely thin sheet of noncellular material. 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 Wolcott, Robert Henry, 1868-1934. New York ; London : McGraw-Hill Book Company, Inc.
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Keywords: ., bookcentury1900, bookcoll, booksubjectbiology, booksubjectzoology
