The beach at 'Sconset, Nantucket Island, covered at certain times of the year with Neptune's purses or mermaid's purses (shark, skate, and chimaera egg cases), inspired Mrs. Marie Overton Corbin to populate the ocean with mischievous elfin 'urchins'. Aided by Engineering Magazine editor and occasional poet Charles Buxton Going, and deftly illustrated by Philadelphia artist Francis I. Bennett, this was the second of two children's books featuring these maritime imps. The Urchins visit the North Pole for playful adventures with polar bears and seals.