. photograph by W. H. LongUy. Fig. 3.—schooi, of pork fishes, massive coral and sea- urchins icextrechlxus), portugas. entirely different appearance is the equallv characteristic long-spined urchin, Centrechinns, which is found only at moderate depths or in the quiet pools of the reef (Fig. 3). The variations in the form of the spines of urchins can be thus roughly compared with those of the corals themselves. Of the active population of a coral reef, the fishes are without doubt the most interesting. Even the

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