. A manual of zoology. iv PHYLUM OELENTERATA 123 It is by this last-named method, the ccenosarc attaining great dimensions, and the individual corallites being small and very numerous, that the most complex of all corals, the Madrepores (Fig. 63, B), are produced. The Actinozoa are remarkable for the variety and brill- iancy of their colour during life. Every one must have noticed the vivid and varied tints of sea-anemones; but in. Fig. 62. — Astraea pallida, the living colony. Natural size. Fiji Islands. (After Dana.) life the corals also exhibit a marvellously varied and gor- geous colouring
. A manual of zoology. iv PHYLUM OELENTERATA 123 It is by this last-named method, the ccenosarc attaining great dimensions, and the individual corallites being small and very numerous, that the most complex of all corals, the Madrepores (Fig. 63, B), are produced. The Actinozoa are remarkable for the variety and brill- iancy of their colour during life. Every one must have noticed the vivid and varied tints of sea-anemones; but in. Fig. 62. — Astraea pallida, the living colony. Natural size. Fiji Islands. (After Dana.) life the corals also exhibit a marvellously varied and gor- geous colouring; and the same holds good of many of the Alcyonaria. Many Actinozoa, like many sponges (p. 89), furnish examples of commensalism, a term used for a mutually beneficial association of two organisms of a less intimate nature than occurs in symbiosis. An interesting example is furnished by the sea-anemone Adamsia palliata. This species is always found on a univalve shell — such as that of a whelk — inhabited by a hermit-crab. The sea-anemone is carried from place to place by the hermit-crab, and in. 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 Parker, T. Jeffery (Thomas Jeffery), 1850-1897; Haswell, William A. (William Aitcheson), 1854-1925. New York, The Macmillan Company; London, Macmillan & Co. ,Ltd.
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