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. Elementary text-book of zoology. HYDRA. "S Fig. 49.—Development of the Nematocyst in Cnidoblast Cells. Rudiment of Nematocyst. Nucleus. Thread.. and are set free by rupture of the epithelial cells. The ovum is produced by the growth and enlargement of a single germ-cell in the ovary, which appears to grow at the expense of the other germ-cells. It escapes by rupture of the epithelial cells and is a creeping amoeboid cell. Both testes and ovaries are found in the same animal, hence Hydra is hermaphrodite. The testes usually appear and ripen prior to the ovaries, a condition known as prot

. Elementary text-book of zoology. HYDRA. "S Fig. 49.—Development of the Nematocyst in Cnidoblast Cells. Rudiment of Nematocyst. Nucleus. Thread.. and are set free by rupture of the epithelial cells. The ovum is produced by the growth and enlargement of a single germ-cell in the ovary, which appears to grow at the expense of the other germ-cells. It escapes by rupture of the epithelial cells and is a creeping amoeboid cell. Both testes and ovaries are found in the same animal, hence Hydra is hermaphrodite. The testes usually appear and ripen prior to the ovaries, a condition known as prot Stock Photo
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The Book Worm / Alamy Stock Photo

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RDHM4R

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7.1 MB (117.4 KB Compressed download)

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1020 x 2450 px | 17.3 x 41.5 cm | 6.8 x 16.3 inches | 150dpi

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. Elementary text-book of zoology. HYDRA. "S Fig. 49.—Development of the Nematocyst in Cnidoblast Cells. Rudiment of Nematocyst. Nucleus. Thread.. and are set free by rupture of the epithelial cells. The ovum is produced by the growth and enlargement of a single germ-cell in the ovary, which appears to grow at the expense of the other germ-cells. It escapes by rupture of the epithelial cells and is a creeping amoeboid cell. Both testes and ovaries are found in the same animal, hence Hydra is hermaphrodite. The testes usually appear and ripen prior to the ovaries, a condition known as protandric. Hydra has no definite respiratory, excretory, or sensory organs, and there are no nervous* nor vascular systems. Movement is effected by the contraction of the muscular * Certain stellate ectoderm cells in connection with the cnidoblasts have been described as nerve-cells. (See Fig. 48.). 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 work.. Masterman, Arthur Thomas. Edinburgh, E. & S. Livingstone

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