"Onward unswerving and relentless, and tittering hilariously to watch the chuckling and hysterics into which the siren song of night and the spheres had turned, that eldritch scaly monster bore its helpless rider; hurtling and shooting, cleaving the uttermost rim and spanning the outermost abysses;"
H.P. Lovecraft, The Dream-Quest Of Unknown Kadath
"These maidens later appeared, much like the Harpies, as the lower half of a bird and above the waist the torso and head and arms of a woman."
"By the later periods of development and the influence of Christianity, the image of the Siren seems to have been equated with that of the northern mermaid whilst retaining the name Siren and in some cased the original description."
"Isidore of Seville gave them scales and webbed feet."
Carol Rose, Giants, Monsters & Dragons