"Eat plenty," said the grown-ups, "then you will soon be like us."
Time passed. The little Urchins did not again try to reach the beach, but they ate plenty and they grew big. Then they began to change. Their funny arms grew shorter and shorter till they disappeared altogether; their bodies grew thicker; and then at last their shells began to come.
"Now we are growing up!" cried Baby Urchin joyfully.
Their shells grew fast, and so did the babies inside, changing their shape altogether. Up and down the round shells ran rows of tiny holes, and in between the rows of holes scores of little white balls grew out. On the balls movable spines grew, and through each hole peeped a new leg ready to stretch far out when it was needed for swimming or walking. Under the shell was the mouth; from it five strong white teeth hung down to crush the seaweed and break it up for food. On top of the shell were tiny eye specks.
At last they were ready. "Come on," cried Baby Urchin. "Nobody can hurt us now." He led the way to the beach. They all followed, swimming with their legs and spines, and looking like hedgehogs in the sea.
What a time they had when they reached the beach! They swam in with a wave, rolled over and over on the beach, burrowed with their tiny spines in the soft sand, and then swam out with the next wave. "It is splendid to be grown up," they said.
WHERE WHITE WAVES PLAY
I.—RED-BILL
In a sand-strewn hollow of a rock ledge on a tiny island lay a seagull's egg, yellow and grey and brown, to match the yellow and grey and brown of the sand and rocks. White waves played beneath it, dancing each day to the foot of the ledge, and throwing handfuls of spray up its rocky side, but never breaking over the top. Sea winds whisked above it, but never blew it from its sandy bed. No hungry hawk spied it from his vigilant soaring place; no hunting dog found it. Safe from harm, and quickened by the genial sun and the warmth of the mother's tender breast, the speck of life inside the egg grew slowly to a seagull baby.