Coloured lithograph of plesiosaur and ichthyosaur, a contemporary continental version of the wall chart by Benjamin Waterhouse Hawkins entitled 'Waterhouse Hawkins Diagrams of the Extinct Animals'. He produced six for the Department of Science and Art. Notable here is the lack of a dorsal fin and straight (rather than correctly bilobe finned) tail of the ichthyosaur (central) - these mistakes only became apparent when skin impressions of the fins were recognised in German specimens. All these species occupied British Coasts in the Jurassic and their reconstruction was largely due to their discovery by Mary Anning and descriptions by William Conybeare.