 Mantell sent a letter detailing his discovery to the local Portsmouth Philosophical Society in December 1824 , several weeks after settling on a name for the fossil creature . The letter was read to members of the Society at a meeting on 17 December , and a report was published in the Hampshire Telegraph the following Monday , 20 December , which announced the name , mis @-@ spelt as " <unk> " . Mantell formally published his findings on 10 February 1825 , when he presented a paper on the remains to the Royal Society of London . 
