Then he became the first Ceylonese surgeon to pass through the primary and final examination for the Fellowship of the Royal College of Surgeons of England (FRCS) without a single examination mishap.
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Anthonis was educated at Milagiriya Singhalese School, St. Joseph’s College, South (now St Peter's College, Colombo) and went on to study medicine at Ceylon Medical College graduating in 1936 winning Loos Gold Medal for Pathology, the Matthew Gold Medal for Forensic Medicine, the Rockwood Gold Medal for Surgery and the Government Diploma Medal after a laps of 11 years.