§ 77-a. Members of the legislature liable to forfeiture of office. The conviction of a member of the legislature or any officer or employee of the legislature of any of the crimes defined in sections seventy-five, seventy-six or seventy-seven of this chapter, shall involve as a consequence in addition to the punishment provided in any such section a forfeiture of his office; and shall disqualify him from ever afterwards holding any office under this state.