The U.S. dollar traded at the lower 81 yen level Thursday in Tokyo. The dollar bought 81.34-35 yen at 5 p.m., against 81.70-80 yen in New York and 81.98-99 yen in Tokyo at 5 p.m. Wednesday. The euro was quoted at 1.3814-3815 dollars and 112.37-41 yen, compared with 1.3764-3774 dollars and 112.52-62 yen in New York and 1.3801-3802 dollars and 113.14-18 yen in Tokyo late Wednesday. 