above the ichthyosaur end of the lake. The Ichthyosaurus models are based on Triassic or Jurassic fossils from Europe. Though the three ichthyosaurs are partly in water, they are implausibly shown basking on land like seals. Owen supposed they resembled crocodiles or plesiosaurs. Better fossil evidence shows that they have more in common with sharks and dolphins, having a dorsal fin and fish-like tail, whereas in Hawkins's models the tail is a flat protuberance from a straight backbone. A further discrepancy is that the models' eyes have exposed bony sclerotic plates, Owen conjecturing that with such large eyes they had "great powers of vision, especially in the dusk". They became one of the three mascots of Crystal Palace Park, along with the Iguanodon and Megalosaurus (although ichthyosaurs are not dinosaurs). Coincidentally, the models more closely resemble more basic ichthyosaurs such as Cymbospondylus. The Iguanodon models represent fossils from the Jurassic and Cretaceous of Europe. Gideon Mantell sketched the original fossil, found in Sussex in 1822 by his wife, Mary Ann Mantell, as like a long slender lizard climbing a branch (on four legs), balancing with a whiplike tail; lacking a skull, he conjectured that the thumb bone was a nose horn. The nose horn in particular is used repeatedly in popular textbooks and documentaries about dinosaurs to make fun of Victorian inaccuracies; actually, even in 1854, Owen commented "the horn [is] more than doubtful". Three Labyrinthodon models were made for Crystal Palace, based on Owen's guess that, being amphibian in lifestyle, the Triassic animals might have resembled frogs; he named them Batrachia, from the Greek 'Batrachios', frog. One is smooth skinned and is based on the species "Labyrinthodon salamandroides" (Mastodonsaurus jaegeri); the other two were based on "Labyrinthodon pachygnathus" (Cyclotosaurus pachygnathus). Casts of Chirotherium footprints that Owen thought were made by the animals were included in the ground around the models. Gigantic and visually impressive, the Megalosaurus became one of the park's three 'mascot dinosaurs' along with the Iguanodon and (less so) the Ichthyosaurs. Working from fragmentary evidence from Jurassic fossils found in England, consisting mainly of a hip and femur (thigh bone), with a rib and a few vertebrae, Owen conjectured the animal was quadrupedal; palaeontologists now believe it to have been bipedal (standing like Tyrannosaurus rex). The first suggestion that some dinosaurs might have been bipedal came in 1858, just too late to influence the model. When the