A Treatise On Zoology volume 2
A Treatise On Zoology volume 2
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In our eReader you can find the full English version of the book. Read A Treatise On Zoology volume 2 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 A Treatise On Zoology volume 2
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The cavity of the sac, known as the coelenteron, is the only cavity of the body, and communicates with the exterior by an opening, the mouth, which serves the double purpose of admitting food into the cavity of the sac, and of expelling undigested matter ; and in the Anthozoa the reproductive elements. There is rarely a second aperture at the end of the body furthest from the mouth opening. A. Vertical line passing through the centre of the mouth is the principal axis of the coelenterate body, ...the secondary axes being disposed radially with regard to the principal axis, though, as will be seen further on, there are many cases in which the primitive radial symmetry is replaced by a more or less well-defined, bilateral symmetry. Around the mouth, but placed at some little distance from it, is a circlet of tentacles disposed radially with regard to the principal axis. The space between the mouth and tentacles is known as the peristome. The tentacles may be solid or hollow ; when hollow, their cavities are prolongations of the coelenteron.
What to read after A Treatise On Zoology volume 2?
You can find similar books in the "Read Also" column, or choose other free books by E Ray Edwin Ray Lankester to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The cavity of the sac, known as the coelenteron, is the only cavity of the body, and communicates with the exterior by an opening, the mouth, which serves the double purpose of admitting food into the cavity of the sac, and of expelling undigested matter ; and in the Anthozoa the reproductive elements. There is rarely a second aperture at the end of the body furthest from the mouth opening. A. Vertical line passing through the centre of the mouth is the principal axis of the coelenterate body, ...the secondary axes being disposed radially with regard to the principal axis, though, as will be seen further on, there are many cases in which the primitive radial symmetry is replaced by a more or less well-defined, bilateral symmetry. Around the mouth, but placed at some little distance from it, is a circlet of tentacles disposed radially with regard to the principal axis. The space between the mouth and tentacles is known as the peristome. The tentacles may be solid or hollow ; when hollow, their cavities are prolongations of the coelenteron.
What to read after A Treatise On Zoology volume 2?
You can find similar books in the "Read Also" column, or choose other free books by E Ray Edwin Ray Lankester to read onlineMoreLess
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