Lithopædion

Double extrauterine pregnancy; lithopædion - "stonechild"
"Litho is Greek for "stone," and Pedia means "child." The fetus is from an extrauterine pregnancy. They were enclosed together in the same membrane, but the second was much younger. By accident the second fetus was not preserved.
 "One year after marriage the mother became pregnant; ceased menstruating and noticed the enlargement of the abdomen. Five weeks before the expected time of labor, the abdomen became smaller.
 "Following this, she had four miscarriages and two living children. Twenty-four years after marriage she died of diarrhoea and general debility. The specimen was removed post mortem, from attachments at the superior strait of the pelvis, and to the right of the fallopian tube."
Donor: Dr. William Pepper 1878