Section 95A. Constables appointed under sections 91, 91A, and 91B or otherwise elected to serve as constables in a city or town shall periodically pay the city or town in which the constable is appointed or elected 25 per cent of all fees the constable collects for the service of civil process under the fee structure established in section 8 of chapter 262. This payment shall be made in installments to be deposited with the city or town treasurer not later than January 15, April 15, July 15 and October 15 of each year, but a constable having less than $500 to deposit at that time shall hold the share for deposit until the sooner of October 15 or the time when the amount due to the city or town under this section equals or exceeds $500. A treasurer receiving funds under this section shall deposit them into the general fund of the city or town, and they shall be expended, subject to appropriation by a majority vote of the city council in a city or by a majority vote of town meeting in a town, for any purpose which the city or town considers necessary.