National Geographic : 1942 Feb
© National Geographic Society Painting byCharles R.Knight With Its Powerful Jaws, the Armored Dinichthys (Terrible Fish) Crushed Luckless Prey Resembling overgrown catfish, some of the giants were 25 feet long. Thick bony plates protected the immense head. Edges ofthejaws were so sawlike and sharp that they resembled teeth. Eluding capture are three stiff-bodied, agile little sharks (Cladoselache), which do not differ greatly from the shark family oftoday. These creatures lived in the Devonian Period, named after Devon, England, where fossils of the epoch were discovered.