In 1923, Zdansky lacked the time to finish the excavation of the holotype. In the Autumn of 1934, Yang Zhongjian ("C.C. Young") and Bian Meinian ("M.N. Bien") returned to the quarry and secured four rear back vertebrae, a left shoulder girdle and a left humerus. These were provisionally designated "exemplar c" by Wilson & Upchurch in 2009. They considered it most likely that these bones belonged to the same individual as the holotype. They were informed in 2007 that this material could no longer be located in the Chinese collections.