A Canadian said:there was a creature with only a few know photographs, which was tought to be extinced since the dinasour age, but back 100 more years ago (im not 100% on the date) (it was a shitty black and white picture so i can only assume). a bunch of fisher men brought a half decomposed corspe onboard their ship of a creature with a long neck, large body and a few fins, and very sharp teeth, they got a good couple of pictures of it, but unfortently they threw the corpse back in the water due to its stink. the creature was about the size of a well feed shark and back then it would of been hard to fake such a gursome looking photo of such a thing.
I think I heard of that too: the fishermen were Japanese, I'm sure. Some considered it to be a severely mutilated shark corpse - others something different.
Or are you thinking of the megamouth shark? That's very likely a living fossil, since its mouth is on the end of its snout rather than located ventrally - like ancestral sharks from Devonian-Permian times, unlike other modern sharks.