British Goblins: Welsh Folk Lore, Fairy Mythology, Legends and Traditions

by Wirt Sikes

Keightley [8] divides into four classes the Scandinavian elements of popular belief as to fairies, viz.: 1. The Elves; 2. The Dwarfs, or Trolls; 3. The Nisses; and 4. The Necks, Mermen, and Mermaids.