"And the conches of the tritons gave weird blasts, and the nereids made strange sounds by striking on the grotesque resonant shells of unknown lurkers in black sea-caves."
H.P. Lovecraft, The Strange High House In the Mist
"This Is the name of a merman and, later, a class of mermen in the classical mythology of Greece and Rome."
"The Tritons are the sons of Neptune/ Poseidon and Amphitrite and are described as having humanoid bodies covered in scales with tails like those of a dolphin. Their heads have matted green or yellow hair, with gills behind their pointed ears, and their wide mouths have huge, fang-like teeth."
Carol Rose, Giants Monsters and Dragons