Sea-Serpent, a marine monster of serpent-like shape whose existence is still a matter of question, although several seemingly authentic accounts have been circulated in attestation. The subject has given rise to much disputation and conjecture on the part of naturalists, but opinion mostly favours the supposition that these gigantic serpent-like appearances are caused by enormous cuttlefish swimming on the surface of the water, with their 20 ft. long tentacles elongated fore and aft. Other fishes which might also be mistaken for the sea-serpent are the barking-shark, tape-fish, marine snake, &c.