EXHIBIT INDEX

EXHIBIT INDEX

Exhibit 1.1   — Underwriting Agreement, dated November 8, 2005, among Boardwalk Pipeline Partners, LP, Boardwalk Pipelines Holding Corp., Boardwalk GP, LP, Boardwalk GP, LLC, Boardwalk Pipelines, LLC, Boardwalk Operating GP, LLC, Texas Gas Transmission, LLC, GS Pipeline Company, LLC, Gulf South Pipeline Company, LP and Citigroup Global Markets Inc., Xxxxxx Brothers Inc., Xxxxxxx, Sachs & Co., Xxxxxxx Xxxxx,  Xxxxxx Xxxxxx & Xxxxx Incorporated, Xxxxxx Xxxxxxx & Co. Incorporated, UBS Securities, LLC, Wachovia Capital Markets, LLC, X.X. Xxxxxxx & Sons, Inc., Xxxxxxx Xxxxx & Associates, Inc., RBC Capital Markets Corporation, KeyBanc Capital Markets, A Division of McDonald Investments Inc. and Deutsche Bank Securities Inc.