had also unearthed several remains of the large North American pterosaur, and based on these remains, Cope named two new species, Ornithochirus umbrosus and Ornithochirus harpyia, in an attempt to assign them to the large European genus Ornithocheirus, but he had missed the 'e' when describing them. The paper naming these species by Cope's paper naming had been published in 1872, just five days after the publication of Marsh's paper. This led to a dispute between the two paleontologists, which both fought over whose names had priority to the published literature, in what was obviously the same species of pterosaur. In 1876, Marsh had described the first skull specimen of Pteranodon, which as unearthed by American paleontologist Samuel Wendell Williston in the Smoky Hill River, located in the Wallace County (now Logan County) of Kansas, USA. Later that year, another skull specimen was found, though this time a bit smaller in size. Soon enough, Marsh recognized a major difference when he described these specimens, they lacked teeth and had bony crests on their skulls. He then described the specimens found as "distinguished from all previously known genera of the order Pterosauria by the entire absence of teeth." Marsh then coined the name Pteranodon (meaning "wing without tooth"), and pointed that the unique characteristics identified warranted a new generic name. Marsh had also reclassified all the previously named North American species from Pterodactylus to Pteranodon, and considered the smaller skull to belong to the reassigned Pteranodon occidentalis based on its size. Specimens of smaller individuals were later uncovered, and Marsh had also named several additional species: Pteranodon comptus and Pteranodon nanus, based on these distinct and smaller fragmentary skeletons. He then created another separate species called Pteranodon gracilis, which is now based on a wing bone that he previously mistook for a pelvic bone. Marsh soon realized his mistake, and therefore reassigned that specimen he found into a separate genus which he named Nyctosaurus, and the species P. nanus was soon recognized as a Nyctosaurus specimen as well, this is due to the synapomorphies seen in both. Later in 1892, Samuel Williston had become the first scientist to critically evaluate all of the Pteranodon species classified by Cope and Marsh. He agreed with most of Marsh's reassignings and classifications, but several exceptions were still made. Williston revised his earlier conclusion in 1903, in which he stated that there were only three