 However, after purchase and cataloging of the material by the AMNH, Henry Fairfield Osborn and Charles Mook described that the specimen had only two vertebrae, a pubis, femur, tooth, scapula, coracoid, ulna and a second femur.The additional material, not mentioned by Cope, was found close in proximity to the holotype and was similar to "Diplodocus", a relative of "Amphicoelias".Their assignment was questioned by subsequent authors Emanuel Tschopp "et al."