Plate, visceral aspect of the sacrum of the hylæosaurus by [Joseph] Dinkel and West Figure 2 from plate XXVII showing a fossilised fragment of the sacrum of the hylæosaurus. Subject: Palaeontology Published in Philosophical Transactions as 'Additional observations on the osteology of the Iguanodon and Hylæosaurus'. Received by the Royal Society on 15 January 1849. Read 8 March 1849. [1849]