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The three classes of Radiates, beginning with the lowest, and naming them in their relative order, are Polyps, Acalephs or Jelly-Fishes, and Echinoderms or Star-Fishes and Sea-Urchins.

The Natural History Club had spent the day at Nahant, studying marine life in the tide pools, scrambling up and down the cliffs with no thought for decorum, bent only on securing the starfish, limpets, sea-urchins, and other trophies of the chase.

Not many days later the wolf's grandmother, who, with the help of her relations, had been searching for him everywhere, entered the cottage to buy some sea-urchins' eggs, and saw the skin, which she at once guessed to be that of her grandson. 'I knew he was dead I knew it!

They sat all day near our camp selling melons, tomatoes, very cheap and tasteless chocolates, raisins, figs and dates. We used to go down to swim in the little bay-like semicircle of the harbour. The water was always warm and very salt. Here were tiny shoals of tiny fish. The water was clear and glassy. There were pinky sea-urchins with spikey spines which jabbed your feet.

With them he defends himself against his enemies, and with them he attacks his prey and tears it to pieces. His bill of fare is composed of some kinds of fish and lower water animals; and it is said that some crabs feed on sharks and whales. In return fishes, sea-stars, sea-urchins and some shell-fish eat the young crustaceans, and even attack the larger ones.

Over the whole he had laid great green leaves that looked like the leaves of the tulip-tree. The narrow end of the canoe was filled with purple sea-urchins, all alive, and of the most vivid color. I took one up, and asked him if they were good to eat. His arrangements looked a great deal more picturesque than our preparations for picnics.

In the sea-urchins the steps can be followed by which a fixed spine becomes articulated to the shell, and is thus rendered movable. I wish I had space here to give a fuller abstract of Mr. Agassiz's interesting observations on the development of the pedicellariae.

Why do you not say that at the same time I commissioned large numbers of fishermen to secure for me at a price striped sea-shells from the shore, smooth pebbles, crabs' claws, sea-urchins' husks, the tentacles of cuttlefish, shingle, straws, cordage, not to mention worm-eaten oyster-shells, moss, and seaweed, and all the flotsam of the sea that the winds drive, or the salt wave casts up, or the storm sweeps back, or the calm leaves high and dry all along our shores?

In the last quarter of the moon they were specially good, though what the moon has to do with their flavor neither the Marquesans nor I know. It is so; the Marquesans have always known it, and I have proved it. The spines of these sea-urchins make slate-pencils in some of the islands, and are excellent for hastily writing on a nearby cliff a message to a friend who is following tardily.

The unhappy man explained to Jack how he had been wrecked on the voyage, and escaped on a raft with one other passenger: how they had drifted far south, before waves and current, till they were cast at last on this wretched island: how they remained there for a month or two, picking up a precarious living on roots and berries and eggs of sea-birds: and how at last, one day, he had come back from hunting limpets and sea-urchins on the shore of a lonely bay to find, to his amazement, his companion gone, and himself left alone on that desolate island.