Story entitled 'Airidh Neill' about a water-horse which arrives at Airidh Neill nam Beann [Àirigh Nèill] nam Beann disguised as a woman. The dog senses it is a water-horse and begins to snarl. The water-horse asks Niall to tie up his dogs but Niall refuses. He throws the water-horse some meat, which it eats in one go. Eventually the dog is let out and is unharmed but when the bitch is let out it kills the water-horse and the water-horse turns into a big white mare on the shore. Niall tied his son to it all night to get rid of his fear. Another time, the water-horse comes disguised as a mermaid called Mor and asks to stay the night. Niall replies with a verse beginning, 'A Mhorag sin s a Mhorag, Cha mhor is fearr de na mnai' and accepts her.