 English biologist Thomas Henry Huxley reconsidered the fish scales described by Agassiz and considered them to belong to a crocodilian . He first proposed this to the Geological Society of London in 1858 , and went into more detail in an 1875 paper in the society 's quarterly journal . By this time , new material had been uncovered from Elgin that indicated that Stagonolepis was not a fish , but a reptile . However , Stagonolepis was still known primarily by scutes and imprints of scutes , many of which were not well preserved . 
