Malformed fetus; sirenomelia, shown in isolation, in 10 numbered illustrations. Fetus with fused legs and feet, shown intact, anterior and posterior views. 2 inset illustrations of the fused feet, anterior and posterior views, 1 illustration of fistula with herniated rectum. 2 illustrations of dissection of abdomen, pelvis and legs, showing intestines, and muscles and tendons of the legs. 2 illustrations of the bones of the legs and feet, showing abnormal hip joints, fusion of the knee joint and feet, anterior and posterior views. 1 illustration of pelvic bones, lateral view.