Caption:
Blue dog shark, Prionace glauca 1, dogfish, Scyliorhinus canicula 2, critically endangered angelshark, Squatina squatina 3, smooth hammerhead, Sphyrna zygaena 4, zebra shark, Stegostoma fasciatum 5 and American paddlefish, Polyodon spathula 6. Copperplate engraving by Thomas Milton from Abraham Rees' Cyclopedia or Universal Dictionary of Arts, Sciences and Literature, Longman, Hurst, Rees, Orme, Paternoster Row, London, December 1, 1808.