They are ridges of aeolian limestone plastered over by a thin layer of corals and other calcareous organisms. The very remarkable "serpuline atolls" are covered by a solid crust made of the convoluted tubes of serpulae and Vermetus, together with barnacles, mussels, nullipores, corallines and some true incrusting corals. [Please select]
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"True," returned the philosopher, "because the corallines can only work under water." [Please select]
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Generally attached to horny corallines, in the warmer temperate seas over the whole world. [Please select]
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_--Specimens are attached to various horny corallines, and occasionally to the peduncles of each other. [Please select]
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Attached to horny corallines, at from twenty to thirty, sometimes even to fifty fathoms in depth, according to Forbes and MacAndrew. [Please select]
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Vegetable life is comparatively scanty in these tropical waters, where there are scarcely any sea-weeds, except the corallines or limestone Algæ of the reefs. [Please select]
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