. Coral and atolls: a history and description of the Keeling-Cocos Islands, with an account of their fauna and flora, and a discussion of the method of development and transformation of coral structures in general. Coral reefs and islands. GROWTH OF THE CORAL COLONY 85 As a rule, coral zooids and coral colonies tend to grow upwards, and the general form of vegetative growth depends on this fact. To this rule there are two noteworthy exceptions in this atoll, and these corals (Ccenopsammia Willeyi and C. nigresccns) Fig. Colony or Ccenopsammia Willeyi Growing from the lower surface of a bo
. Coral and atolls: a history and description of the Keeling-Cocos Islands, with an account of their fauna and flora, and a discussion of the method of development and transformation of coral structures in general. Coral reefs and islands. GROWTH OF THE CORAL COLONY 85 As a rule, coral zooids and coral colonies tend to grow upwards, and the general form of vegetative growth depends on this fact. To this rule there are two noteworthy exceptions in this atoll, and these corals (Ccenopsammia Willeyi and C. nigresccns) Fig. Colony or Ccenopsammia Willeyi Growing from the lower surface of a boulder. generally grow with their zooid mouths turned downwards. Now I think these exceptions to be not without interest, for both these corals live in dark places—they prefer, in fact, the under sides of boulders, and they possess no symbiotic algse in their tissues. They are coloured respectively red and black; and I would put it forward as a speculative idea, that it is the innate tendency of the symbiotic algse to grow upwards, rather than any innate property of the corals themselves, that causes the general growth tendency of the corals. It is true that the zooids on the lower surfaces of plate- forms grow downwards : but as a rule I believe those horizontal. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Jones, F. Wood (Frederic Wood), 1879-1954. London, Lovell Reeve & Co. , Ltd.
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Keywords: ., bookauthorjonesfwo, bookcentury1900, bookdecade1910, bookyear1912
