The Science of Life Or the Animal And Vegetable Biology
The Science of Life Or the Animal And Vegetable Biology
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83. Tubicora Musica. Organ-pipe Coral.
living state the branches are covered with a red cceno- sarc, (common flesh, ) studded with polyps. (Fig. 82. ) The feather-shaped sea-pens (Pennatula] have the ex- tremities of their stems buried in sand. In some genera, as, Virgularia, the stem is prolonged to between three and four feet in length, while the polypiferous lobes are comparatively short. The red organ-pipe coral of the Indian Ocean, (Fig. 83, ) with its table-like partitions and green polyp...s, belong also to this group. 16 182 THE SCIENCE OF LIFE.
The work of the reef-building polyps is extremely interesting. They will not live in water whose mean temperature is below 68 F. , nor at a greater depth than twenty fathoms, yet coral reefs are constantly found which are several hundred fathoms thick. This appar- ent paradox is due to the fact that the land where coral reefs are forming is constantly subsiding, and fresh living corals are taking the place of the dead ones. If the center of a reef sinks more quickly than the sides a lagoon is left, surrounded by a circular reef of coral, called an atoll ; if an island rises in the middle of this lagoon a barrier reef is said to be formed, (Fig.
What to read after The Science of Life Or the Animal And Vegetable Biology?
You can find similar books in the "Read Also" column, or choose other free books by J H Joseph Henry Wythe to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
83. Tubicora Musica. Organ-pipe Coral.
living state the branches are covered with a red cceno- sarc, (common flesh, ) studded with polyps. (Fig. 82. ) The feather-shaped sea-pens (Pennatula] have the ex- tremities of their stems buried in sand. In some genera, as, Virgularia, the stem is prolonged to between three and four feet in length, while the polypiferous lobes are comparatively short. The red organ-pipe coral of the Indian Ocean, (Fig. 83, ) with its table-like partitions and green polyp...s, belong also to this group. 16 182 THE SCIENCE OF LIFE.
The work of the reef-building polyps is extremely interesting. They will not live in water whose mean temperature is below 68 F. , nor at a greater depth than twenty fathoms, yet coral reefs are constantly found which are several hundred fathoms thick. This appar- ent paradox is due to the fact that the land where coral reefs are forming is constantly subsiding, and fresh living corals are taking the place of the dead ones. If the center of a reef sinks more quickly than the sides a lagoon is left, surrounded by a circular reef of coral, called an atoll ; if an island rises in the middle of this lagoon a barrier reef is said to be formed, (Fig.
What to read after The Science of Life Or the Animal And Vegetable Biology?
You can find similar books in the "Read Also" column, or choose other free books by J H Joseph Henry Wythe to read onlineMoreLess
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