Though the paired arrangement of the nephridia is the prevalent one in the Chaetopoda, there are many examples, among the Oligochaeta, of species and genera in which there are several, even many, nephridia in each segment of the body, which may or may not be connected among themselves, but have in any case separate orifices on to the exterior. [Please select]
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Much better to close up all the orifices. [Please select]
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Both orifices are under the full thickness of your hair. [Please select]
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We came to open orifices down which we looked into the fiery river which rushed madly under our feet. [Please select]
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31, which shows one of the orifices in section, together with the adjoining paving stones. [Please select]
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_--On the borders of the carapace, at the anterior end, on the sternal surface, there are two minute orifices, in _L. [Please select]
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