Yeats' FAIRY AND FOLK TALES OF THE IRISH PEASANTRY

THE MERROW

   The Merrow, of if you write it in the Irish, Moruadh or Murúghach, from muir, sea, and oigh, a maid, is not uncommon, they say, on the wilder coasts. The fishermen do not like to see them, for it always means coming gales. The male Merrows (if you can use such a phrase--I have never heard the masculine of Merrow) have green teeth, green hair, pig's eyes, and red noses; but their women are beautiful, for all their fish tails and the little duck-like scale between their fingers. Sometimes they prefer, small blame to them, good-looking fishermen to their sea lovers. Near Bantry in the last century, there is said to have been a woman covered all over with scales like a fish, who was descended from such a marriage. Sometimes they come out of the sea, and wander about the shore in the shape of little hornless cows. They have, when in their own shape, a red cap, called a cohullen druith, usually covered with feathers. If this is stolen, they cannot again go down under the waves.
   Red is the colour of magic in every country, and has been so from the very earliest times. The caps of fairies and magicians are well-nigh always red.