Alexander Karpinsky is an encyclopaedic scientist of the 19th to early 20th centuries. A number of his studies focused on palaeontology. The Palaeontological Museum houses his collection of fossils that are featured in the work on the spiral shells of cephalopods — ammonoids from the Permian deposits of the Urals. After the publication of this work, Karpinsky received a strange ‘shell of ammonite’ from those places. Having thoroughly examined the mysterious find, Karpinsky discovered that it was not a spiral shell of a mollusc, but a strange jaw of a shark-like fish. He named the new fish as helicopryon (in Greek — spiral saw). Authors of the exhibition: Glinskii V.N., Mkhitarian T.G.
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