§ 67. Additional counsel. The governor or attorney-general may designate and employ such additional attorneys or counsel as may be necessary to assist in the transaction of any of the legal business mentioned in section sixty-three of this chapter and such attorneys or counsel shall be paid a reasonable fee upon the certificate of the governor and attorney-general, the amount thereof to be audited and allowed by them or to be paid by the attorney-general out of costs, penalties and judgments collected by him, prior to the payment thereof into the state treasury as required by § 121 of the state finance law.