ABSTRACT
There are ten or so kinds of chiton which might be found in Red Sea coral-reef areas, but much the largest and most conspicuous, and perhaps the commonest, is Acanthopleura haddoni, which is about five centimetres long. Worm shells, in complete contrast to the spider conch, rarely attract the attentions of the collector since the shells look much more like the casts of worms, and moreover they are typically found embedded within the coral. Elysia have thus become a photosynthesising green animal by a different route and perhaps in a truer sense than are the corals and another group of molluscs to which we shall presently come. Thus Murex tribulus, Chicoreus ramosus, and Fusus polygonoides are found among rocks and corals on the reef, while the dog whelks are more characteristic of the rocks and boulders near the tide-level, and the cones have diversified to occupy a variety of situations.
