Abstract: The writer's of the present paper recently secured two fragments of fossil mammalian mandible belonging the same individual, with well preserved P4-M3 and partially damaged P2 and P8, from Sihong of Jiangsu Province. The discovery is of great interest and important from the palaeontological as well as stratigraphical points of view, because it has provided not only the first fossil proof of the presence of anthracothere in Sihong district, but represents a nep form. Therefore we like to give the following notes of this interesting specimen.