All positions in the Municipal service shall be filled pursuant to the preceding section except the following:
Members of the Council and the Mayor
Members of Boards and Commissions
Manager
Directors of Departments
Clerk of Council
Secretary to the Manager
Auxiliary Policemen
Police Chief
Assistant Manager
Temporary employees of exceptional professional or scientific qualifications engaged as consultants for limited periods of time
Such unskilled labor as the Personnel Advisory and Appeals Board finds impracticable to include in the classified service.