Section 3. Members of common council; appointments to other city offices

No member of the common council of any city shall, during the period for
  which he was elected, be capable of holding  under  the  appointment  or
  election  of  the  common council any office the emoluments of which are
  paid from the city treasury, or paid by fees or compensation directed to
  be paid by any act or ordinance of the common council, but this  section
  shall  not  affect  the right to any fees or emoluments belonging to any
  office, provided, however, that in any city having  a  city  manager  or
  council-manager  form  of government in which a mayor and vice-mayor may
  be elected or appointed from the membership of its council,  such  mayor
  and   vice-mayor   may,  in  addition  to  the  emoluments  received  as
  councilman, receive  compensation  for  their  services  from  the  city
  treasury  as  mayor  and vice-mayor. An officer of any city who violates
  any provision of this section shall be guilty of a  misdemeanor  and  on
  conviction thereof his office shall be vacant.