In any county in which the county convention establishes the office of deputy sheriff the sheriff may appoint such number of deputy sheriffs, including a chief deputy sheriff, within the limits of the funds that may be appropriated for this purpose. In addition, he may appoint such special deputy sheriffs as he shall from time to time require. Such special deputy sheriffs shall receive as compensation for their services the fees as provided in N.H. Rev. Stat. § 104:31.