The remains of the skeleton of the Hylaeosaurus.  Disovered by Gideon Mantell in 1832 in the Tilgate Forest of Sussex.

4 different depictions:

Gideon Mantell, The Geology of the South-east of England. 1833.

Gideon Mantell, The Wonders of Geology. 1840.

Richard Owen, Geology and inhabitants of the ancient world. 1854.

Richard Owen, Monograph on the Fossil Reptilia of the Wealden Formation. Part IV. London: Paleontographical Society, 1857. Series: Paleontographical Society Volumes, vol. 10. (1856).