Already struggling against the run, the New York Jets defense took another hit Tuesday, as starting weakside linebacker Eric Barton was lost for the 2005 season, the result of a torn left triceps suffered in Monday night's loss at Atlanta. The injury will require surgery and Barton will be placed on injured reserve. Barton, 28, was the Jets' leading tackler in 2004, with 125 stops, and he also led the team in fumble recoveries, with three. In four games this season, he had 21 tackles.