had been preoccupied by Megadactylus Fitzinger 1843, a subgenus of the lizard genus Stellio. In 1882, he replaced the name with Amphisaurus, "near saurian", probably referring to Marsh's interpretation of it as intermediate between primitive dinosaurs—at the time the British Palaeosaurus was an example of what was thought to be a primitive dinosaur—and more derived dinosaurs. In 1885, Marsh had discovered that this name also had been preoccupied, by the anthracosaurian Amphisaurus Barkas 1870, and again replaced it by Anchisaurus, with the same meaning. Meanwhile, nearly complete specimens had been found in Manchester, Connecticut. In 1884, a series of bridges was built over the Hop Creek. Sandstone blocks were sawed out of Wolcott's Quarry north of Buckland Station. On 20 October, an amateur paleontologist, Charles H. Owen, observed that a block had been removed containing the hind part of a skeleton. He warned Marsh who, using T. A. Bostwick as an intermediary, acquired the piece from the quarry owner, Charles O. Wolcott. Marsh tried to secure the front half of the skeleton but it had already been used in a bridge abutment. The specimen, YPM 208, was named Anchisaurus major, "the larger one", by Marsh in 1889. Eventually, when the bridge was demolished in August 1969, John Ostrom would save the front block. Subsequently, two other dinosaur fossils were located in the quarry. Six metres south of the original find a second skeleton was visible in the quarry face. It was removed as a single block and given the inventory number YPM 1883. In Yale, the part containing the skull was split off and became specimen YPM 40313. In 1891, Marsh made Anchisaurus major a separate genus, Ammosaurus, the "sand saurian". In the same publication he named YPM 1883/YPM 40313 as a new species of Anchisaurus, Anchisaurus colurus, "the mangled one". They served as the templates from which O. C. Marsh in 1893 restored the skeleton. The Manchester specimens are now considered conspecific with Anchisaurus polyzelus. The East Windsor and Manchester specimens are housed at the Peabody Museum of Natural History at Yale University. The type species is Hitchcock's A. polyzelus. Marsh's A. major (also known as Ammosaurus), A. solus, and A. colurus (also known as Yaleosaurus), have since been recognized as synonyms of A. polyzelus, their supposed differences being due to misinterpretation and different stages of growth. In 2015, the ICZN formally made the more complete type specimen of