From Charles Leland 'Gypsy Sorcerer', published in 1891...
"You must break the shells to bits for fear
Lest the witches should make it a boat my dear.
For over the sea away from home,
Far by night the withes roam."
Then the girl said, "I don't see why the witches should not have boats as well as other people." And saying this she threw the shell of an egg which she had been eating as far as she could, and cried, "Witch, there is your boat!" But what was her amazement to see the shell caught up by the wind and whirled away on high till it became invisible, while a voice cried, "I thank you!"
Now it came to pass some time after that the gypsy girl was on an island, where she remained some days. And when she wished to return, behold a great flood was rising, and it had washed her boat away, she could see nothing of it. But the water kept getting higher and higher, and soon there was only a little bit of the island above the flood, and the girl thought she must drown. Just then she saw a white boat coming; there sat in it a woman with witch eyes; she was rowing with a broom, and a black cat sat on her shoulder. "Jump in!" she cried to the girl, and then rowed her to the firm land.
When she was on the shore the woman said: "Turn around three times to the right and look every time at the boat." She did so, and every time she looked she saw the boat grow smaller till it was an egg. Then the woman sang:-
"That is the shell you threw to me,
Even a witch can grateful be."
Saying this she vanished, cat, broom, shell, and all.
"Now my story is fairly done,
I beg you tell a better one."