“They write from Galicia in Spain that some fishermen lately took on that coast a sort of monster, or merman, five feet and half long from it’s foot to its head, which was like that of a goat. It has a long beard and moustaches, and black skin somewhat hairy, a very long neck, short arms, and hand longer than they ought to be in proportion to the rest of the body: long fingers like those of a man, with nails like claws, very long toes, joined like the feet of a duck, and the heels furnished with fins resembling the winged feet with which painters represent Mercury. ”
From Scots Magazine 1739.
In Spanish a mermaid is a sirena. More Iberian knicknackery here