We report a case of twin gestation (monochorionic diamniotic) in which one of the twins was an acardiac, acephalic. His co-twin suffered growth retardation and early neonatal death. Twin incidence in the Yoruba ethnic group is very high [6 per 100 births]; ironically this is the first report of acardiac monster in Nigeria if not in the African continent; only 8 percent of deliveries are conducted by doctors in Nigeria.