. A manual of zoology. Zoology. e7i s ek c Fig. 169. Fig. 170. Fig. i6g.—Hydra viridis* testes above; ovarian enlargement and escaping egg below. Fig. 170.—Body layers of Hydra (after Schulze, from Hatschek). c, cuticula; en, nettle cells; ck, ectoderm; en, entoderm; s, supporting layer. some support (stone, alga, snail-shell, etc.) and form a network, the hydrorliiza, or it may stand erect and free, forming a hydrocaidus. Usually both hydrorhiza and hydrocaulus occur in the same colony. Usually the colony is strengtheired and protected by the perisarc, a cuticrdar secretion of the ectoderm. I
. A manual of zoology. Zoology. e7i s ek c Fig. 169. Fig. 170. Fig. i6g.—Hydra viridis* testes above; ovarian enlargement and escaping egg below. Fig. 170.—Body layers of Hydra (after Schulze, from Hatschek). c, cuticula; en, nettle cells; ck, ectoderm; en, entoderm; s, supporting layer. some support (stone, alga, snail-shell, etc.) and form a network, the hydrorliiza, or it may stand erect and free, forming a hydrocaidus. Usually both hydrorhiza and hydrocaulus occur in the same colony. Usually the colony is strengtheired and protected by the perisarc, a cuticrdar secretion of the ectoderm. In some (fig. 172) the perisarc stops at the base of the hydranth; in others (fig. 173) it expands distally into a wide-mouthed bell, the liydrotlieca, into which the hydranth may retract. In rare cases this perisarc may be greatly increased and calcified, forming large coral-like masses with openings from which the hydranths may protrude (fig. 174).. 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 Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929, ed. and tr. New York, H. Holt
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
