The taxonomic history of "Pelorosaurus" and "Cetiosaurus", as noted by reviewers including Michael P. Taylor and Darren Naish, is highly confusing. In 1842, Richard Owen named several species of "Cetiosaurus". Among them was "Cetiosaurus brevis", based on several specimens from the early Cretaceous Period. Some of these, four caudal vertebrae, BMNH R2544–2547, and three chevrons, BMNH R2548–2550, found around 1825 by John Kingdon near Cuckfield in the Tunbridge Wells Sand Formation of the Hastings Beds, belonged to sauropods. Others however, including BMNH R10390, found near Sandown Bay on the Isle of Wight, and BMNH R2133 and R2115, found near Hastings, actually belonged to some iguanodont. Noticing Owen's mistake in assigning iguanodont bones to "Cetiosaurus", comparative anatomist Alexander Melville renamed the sauropod bones "Cetiosaurus conybeari" in 1849.