Carnegie Institution of Washington Publication No. 102
Carnegie Institution of Washington Publication No. 102
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In our eReader you can find the full English version of the book. Read Carnegie Institution of Washington Publication No. 102 Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Carnegie Institution of Washington Publication No. 102
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This rolling motion is confined exclusively to the posterior sexual 107 io8 Papers from the Marine Biological Laboratory at Tortugas, end of the worm, and ceases abruptly at the point marked a in figure i, which is the segment separating the narrow middle part of the worm from the swollen sexual part of its body.
The sexual segments are thus twisted off at the point a, and on being set free they swim vertically upward to the surface, where the posterior end of the worm continues to progress rap...idly along, moving backward, as is shown in figure 2.
The male sexual ends are salmon red or dull pink, while the females are greenish-gray or drab, so that they can readily be distinguished at a glance.
If while the sexual end is swimming we cut it into pieces, each sepa- rate length continues to swim backward with its characteristic rolling move- ment. This shows that the stimulus which produces the twisting movement is not localized, but is developed throughout the sexual end of the worm.
The worms continue to swim in all directions over the surface, and show no tendency to congregate in masses, each worm pursuing its own course without regard to its fellows of either sex.
What to read after Carnegie Institution of Washington Publication No. 102?
You can find similar books in the "Read Also" column, or choose other free books by Carnegie Institution of Washington to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
This rolling motion is confined exclusively to the posterior sexual 107 io8 Papers from the Marine Biological Laboratory at Tortugas, end of the worm, and ceases abruptly at the point marked a in figure i, which is the segment separating the narrow middle part of the worm from the swollen sexual part of its body.
The sexual segments are thus twisted off at the point a, and on being set free they swim vertically upward to the surface, where the posterior end of the worm continues to progress rap...idly along, moving backward, as is shown in figure 2.
The male sexual ends are salmon red or dull pink, while the females are greenish-gray or drab, so that they can readily be distinguished at a glance.
If while the sexual end is swimming we cut it into pieces, each sepa- rate length continues to swim backward with its characteristic rolling move- ment. This shows that the stimulus which produces the twisting movement is not localized, but is developed throughout the sexual end of the worm.
The worms continue to swim in all directions over the surface, and show no tendency to congregate in masses, each worm pursuing its own course without regard to its fellows of either sex.
What to read after Carnegie Institution of Washington Publication No. 102?
You can find similar books in the "Read Also" column, or choose other free books by Carnegie Institution of Washington to read onlineMoreLess
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