Medieval conjoined twins with 2 arms and 2 legs. Most authorities believe that Mary and Eliza Chulkhurst were joined only at the hip and not at the shoulder which would classify them as pygopagus twins. These comprise about 18% of conjoined twins.Source: Wellcome Library Western MS 136. Pierre Boaistuau. Histoires prodigieuses: a compendium of prodigies and freaks of nature drawn from ancient authorities. J de Bordeaux, Paris 1568.