HE-GOAT
According to the web source, Mythological and Symbolic Significance of Goats, "both sexes symbolize fertility, vitality and ceaseless energy." But the he-goat "is lust personified, and a goat with a human head depicts depravity." Hawthorne's reveler has the limbs of a mortal man but the beard and horns of a goat and thus in the eyes of Endicott is symbolic of the depravity the Puritans suspect at Merry Mount.