Song/Yuan DynastyEach halve precisely carved in mirror-image as a recumbent mythical beast with elongated neck, the defined legs tucked underneath with incised claws, the exterior slightly rounded and interior flattened, one section with two raised square bosses which accurately fit to square indentations on the other section, each section incised with half an inscription, which when united forms the inscription on the top of 'Yu shang jun tai shou si wei hu hu di er' and on the underside 'He tong', the stone of yellow tone with russet inclusions and calcification, box. 5cm (1 15/16in) long (3).