Section 17. Jurisdiction

1.  County civil service commission or personnel
  officer.  The civil service commission or personnel officer of a  county
  shall  administer  the  provisions  of  this chapter with respect to the
  offices and employments in the classified service of such county and the
  civil divisions therein including school districts, except cities  which
  are  operating  under  one  of  the  optional  forms  of  civil  service
  administration provided in section fifteen of this chapter and the  city
  school districts of such cities.
    2.    City  or  suburban  town  civil  service commission or personnel
  officer.  Except as otherwise provided by special  law  enacted  by  the
  legislature, the civil service commission or personnel officer of a city
  or  suburban  town  described in subdivision four of section two of this
  chapter shall administer the provisions of this chapter with respect  to
  the  offices  and employments in the classified service of such suburban
  town or city, including the city school districts of such city.
    3.  Regional civil service commission or regional  personnel  officer.
  A  regional civil service commission or regional personnel officer shall
  administer the provisions of this chapter with respect  to  the  offices
  and  employments which would otherwise be subject to the jurisdiction of
  the civil service commissions or personnel officers  of  the  respective
  counties  and  cities  under  the  jurisdiction  of  such regional civil
  service commission or regional personnel officer.
    4.  Each municipal commission and personnel officer shall  have  power
  at  its own expense to conduct examinations and establish eligible lists
  for any position within its jurisdiction.