Ectopagus (laterally conjoined) dicephalus dibrachius tripus twins.
From Part IV of the collection of pictures of congenital abnormalities that form the basis of the four-volume atlas Human Monstrosities by Barton Cooke Hirst (1861-1935) and George Arthur Piersol (1856-1924), published 1891-93.
From Mütter Museum: Historic Medical Photographs
