and preparation of the fossil performed by Anning to the staff at Bullock's museum. Perplexed by the creature, Home kept changing his mind about its classification, first thinking it was a kind of fish, then thinking it might have some kind of affinity with the duck-billed platypus (only recently known to science); finally in 1819 he reasoned it might be a kind of intermediate form between salamanders and lizards, which led him to propose naming it Proteo-Saurus. By then Charles Konig, an assistant curator of the British Museum, had already suggested the name Ichthyosaurus (fish lizard) for the specimen and that name stuck. Konig purchased the skeleton for the museum in 1819. The skull of the specimen is still in the possession of the Natural History Museum in London (to which the fossil collections of the British Museum were transferred later in the century), but at some point, it became separated from the rest of the skeleton, the location of which is not known. Anning found several other ichthyosaur fossils between 1815 and 1819, including almost complete skeletons of varying sizes. In 1821, William Conybeare and Henry De la Beche, both members of the Geological Society of London, collaborated on a paper that analysed in detail the specimens found by Anning and others. They concluded that ichthyosaurs were a previously unknown type of marine reptile, and based on differences in tooth structure, they concluded that there had been at least three species. Also in 1821, Anning found the skeleton from which the species Ichthyosaurus platydon (now Temnodontosaurus platyodon) would be named. In the 1980s it was determined that the first ichthyosaur specimen found by Joseph and Mary Anning was also a member of Temnodontosaurus platyodon. In 2022, two plaster casts of the first complete ichthyosaur skeleton fossil found by Anning that was destroyed in the bombing of London during the Second World War, were discovered in separate collections. One is at the Peabody Museum of Natural History at Yale University in the USA and the other at the Natural History Museum in Berlin, Germany. The casts may be secondary, being made from a direct cast of the fossil, but are determined to be of good condition, "historically important", and likely taken from the specimen put for sale at auction by Anning in 1820. Plesiosaurus In the same 1821 paper he co-authored with Henry De la Beche on ichthyosaur anatomy, William