(October 15, 2015, 12:20 PM EDT) -- BOSTON — Defendants in a securities class action lawsuit filed appellee briefs in the First Circuit U.S. Court of Appeals on Sept. 25, alleging that a federal district court did not err in dismissing federal securities law claims against them for various reasons (In re ARIAD Pharmaceuticals Inc. Securities Litigation, No. 15-1491, 1st Cir.)....