Two cases of hydatidiform mole with living fetus are reported. The first case, in 1956, developed toxaemia with bleeding at 20 weeks. Labour was induced by pitocin drip and a living male fetus of 20 weeks deveopment, with exomphalos, delivered. After a placenta of 8cm. diameter, much molar tissue was passed. Hysterectomy was performed 7 weeks later, the path- ological diagnosis being infiltration mole. The Friedman test remained strongly positive and when last seen 4 months after operation the patient had evidence of pulmonary metastses. The second case, in 1966, was delivered of a living male fetus weighing 850 grams which survived 2 hours 40 minutes. There was a normal placenta 230 grams and a large amount of molar tissue. The incidence diagnosis, patholgy and management are discussed.