Miss. Code § 27-37-27
When the assessor and chancery clerk shall receive the roll or schedule of land from the state tax commission, as provided by Section 27-37-21 of this article, in the years in which land is not assessed, or after the completion of the roll in land assessment years, they shall present the same to the board of supervisors, and the board shall carefully compare it with the land assessment roll of the county. It shall be the duty of the board of supervisors of each county in which any of such lands are located, to require the assessor to prepare proper petitions for the cancellation or change of assessments as provided by Section 27-35-143, Mississippi Code of 1972, and the board shall proceed to adopt proper orders as required by Section 27-35-149, Mississippi Code of 1972, so as to cancel all assessments against land owned by the United States for the purposes set forth in this article, and to assess to the proper owners any lands which are taxable to individual owners. All such petitions prepared by the assessor shall be acted upon by the board, proper orders adopted, as herein provided, and the same submitted to the tax commission for its approval or disapproval, to the end that all lands which are exempt from assessment shall be so shown on the roll, and all parties properly assessed with the lands owned, and the tax collector credited with any assessments with which he may be charged, and which are cancelled or reduced.
Miss. Code § 27-37-27