TOKYO, Dec 27 (Reuters) - Japan"s longer-ended bonds were untraded on Monday in holiday-thinned trade, while an auction for two-year notes saw stronger demand than the previous sale. Benchmark 10-year JGB futures rose 0.04 point to 151.87, with a trading volume of 6,236 lots. The government auction for two-year notes received bids worth 4.25 times the amount sold, higher than the bid-cover-ratio of 4.05 times at the previous auction. Bonds with maturity longer than 10 years were not traded. The 10-year JGB yield remained at 0.060%, while the 20-year JGB yield was at 0.470%. The 30-year JGB yield was at 0.675% and the 40-year JGB yield was at 0.725%. The two-year JGB yield was flat at minus 0.100%. The five-year yield rose 0.5 basis point to minus 0.085%.