++++ Accession of new Member States to the Communities - Portugal - Free movement of persons - Workers - Equal treatment - Portuguese national employed on board a ship of one of the Member States since a date prior to accession - Right to reside in the territory of the Member State in which employment is held ( Act of Accession of 1985, Art . 216(1 ); Regulation No 1612/68 of the Council, Art . 7 et seq .; Council Directive 68/360, Art . 4 )