Each surviving spouse of a deceased member of the fund and each surviving child of a deceased member of the fund receiving benefits pursuant to former section 742.37 of the Revised Code shall have benefits increased by the following amounts:
(A) Surviving spouse of a deceased member of the fund, forty dollars per month;
(B) Surviving child of a deceased member of the fund, ten dollars per month.
Survivors of members of the fund who are receiving a pension in accordance with the rules governing the granting of pensions and benefits in force on April 1, 1947, which provide an increase in the original pension or benefit pursuant to changes in the salaries of active members, are not eligible for the benefits provided in this section.