. Animal biology. Zoology; Biology. HYDRA 137 they are spermaries, or testes; if they are more knobUke and are situated nearer the base they are ovaries (Fig. 58). 163. Internal Structure.—When studied by means of sections (Fig. 58) in which the structure is brought out by appropriate staining, the hydra is seen to be made up of a body wall surrounding a large central Nemorhcysfs. Older bud flagellated cell Oi/ary Fig. 58.—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 t
. Animal biology. Zoology; Biology. HYDRA 137 they are spermaries, or testes; if they are more knobUke and are situated nearer the base they are ovaries (Fig. 58). 163. Internal Structure.—When studied by means of sections (Fig. 58) in which the structure is brought out by appropriate staining, the hydra is seen to be made up of a body wall surrounding a large central Nemorhcysfs. Older bud flagellated cell Oi/ary Fig. 58.—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 gasiravascular 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 are 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; University of Nebraska (Lincoln campus). Dept. of Zoology. New York ; London : McGraw-Hill Book Company, Inc.
Size: 1326px × 1884px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcoll, booksubjectbiology, booksubjectzoology
