The legend of Marmennil and Anfinnur who was a farmer in Elduvík goes like this:

Tradition says that a beast called Marmennil lives on the bottom of the sea. He looks human but is smaller than man and has long fingers. Marmennil is teasing the fishermen by biting of the bait and then fixing the hooks to the bottom of the sea so their line eventually breaks.

Once Marmennil came to grief though. He was fixing Anfinnur's hook to the bottom while all of a sudden the hook was fixed deep in his hand. He was then drawn into the boat. The men in the boat made the sign of the cross and brought the beast to their home.

Hereafter they always brought with them Marmennil when they went fishing. They had to remember always to make the sign of the cross on him when he was onboard. The fishermen could always tell if there was fish in the sea below, as Marmennil would start to laugh and play in the boat. If they then through out the gear they would be sure to make a catch.

Arnfinnur had the Marmennil with him for a long time. But one day when they floated the boat the surf was heavy and they forgot to make the sign of the cross. As soon as the boat was on the sea Marmennil sneak overboard never to be seen again.