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In Selachians the quality of the bones is granular, instead of fibrous, as in fishes; the arches above and below the backbone are formed by flat plates, instead of the spines so characteristic of all the fish proper; and the skull consists of a solid box, instead of being built of overlapping pieces like the true fish-skull.
As Huxley long ago remarked, "When Nature undertook to build the skull of a land animal she was too lazy to start on new lines, and simply took the old fish-skull and made it over, for air-breathing purposes." And a clumsy job she made of it!
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