. An introduction to zoology [microform] : for the use of high schools. Zoology; Zoologie. w 'l ' f}^ 246 HIGH SCHOOL ZOOLOGY. One end of the tube is closed, and serves for attachment, the other opens by the mouth, which is surrounder' by tubulai- tentacles, capable of extraordinary elongation, and employed for seizing the minute animals on which they feed. Both layers of the body-wall (ectoderm and endoderm) take part in the formation of the tentacles. Hydra owes its generic name to its extraordinary power of recovery after injury, any fragment of an individual being capable of reproducing th
. An introduction to zoology [microform] : for the use of high schools. Zoology; Zoologie. w 'l ' f}^ 246 HIGH SCHOOL ZOOLOGY. One end of the tube is closed, and serves for attachment, the other opens by the mouth, which is surrounder' by tubulai- tentacles, capable of extraordinary elongation, and employed for seizing the minute animals on which they feed. Both layers of the body-wall (ectoderm and endoderm) take part in the formation of the tentacles. Hydra owes its generic name to its extraordinary power of recovery after injury, any fragment of an individual being capable of reproducing the rest. The marine Hydroids form colonies, often arborescent (Fig. 178), the connecting stems of which are always, and the individuals frequently, protected by a horny exoskeleton—the perisarc (Fig. 179). Eggs are formed in peculiarly-shaped individuals,. Fig. 178—Hydroid colony. {Obelaria gelatinota). Fig. 179,—Diagram of Hydroid colony (after Allman) b, root or hydrorhiza; a, ccsnosarc; a^,peris- arc; h, inodifled individual with reproductive buds (i) about to as- sume the fonr of locomotive medusffi lilce*; individ- ual; e, uioutb; g, 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 Wright, R. Ramsay (Robert Ramsay), 1852-1933. Toronto : Copp, Clark
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Keywords: ., bookcentury1800, bookdecade1880, bookpublishe, booksubjectzoology
