Image courtesy of Davidson, J. P. (2002). Bonehead mistakes: The background in scientific literature and illustrations for Edward Drinker Cope’s first restoration of Elasmosaurus platyurus. Proceedings of the Academy of Natural Sciences of Philadelphia, Vol. 152, p. 220 (via JSTOR)

Fossil remains of Plesiosaurus macrocephalus, a large marine reptile similar to Elasmosaurus platyurus.