This Index, issued in July, 1624, under the authority of the Inquisitor-General, Fernando Martius Mascarenhan, bears as its main title the wording _Index auctorum damnatae memoriae, tum etiam librorum, qui vel simpliciter, vel ad expurgationem usque prohibentur, vel denique jam expurgatae permittentur_. As indicated by this title, the Index is expurgatory as well as prohibitory. Part I presents the lists of books prohibited in the Roman Indexes and decrees up to the year 1610. The three classes are merged under a single alphabet. Part II presents an _Index prohibitorius Lusitaniae_, in which are summarised, under one alphabet for each language considered, the several lists of the Portuguese prohibitions. These Portuguese prohibitions follow very closely the lists of Sandoval. The rules, based in substance upon the Ten of Trent, are here expanded into fifteen. The material in the expurgatory section is in larger part transcribed from Sandoval. The Index of Trent had been printed in Portugal in 1581, and that of Clement in 1597. The Portuguese historian Seabra takes the ground that, under Philip IV, no Index could be published without the authority of the King. Philip had, in Portugal as in Spain, maintained a certain personal supervision of the censorship operations of the Inquisition. Reusch is of opinion that any reprints of the Roman Indexes must have secured the approval of the King. In 1623, the King issued an order prohibiting the reprinting, without the authority of the chamberlain of the palace, of any book which had originated outside of Portugal. In 1633, this order was renewed, with the specification of books bearing upon the authority of the State and the history of the times. In the edict which stands at the head of the Lisbon Index, the inquisitor-general directs that copies of all books specified in the prohibited lists shall, within thirty days, be delivered to the local inquisitors, and further, that persons possessing copies of books belonging to the general classes prohibited, or of books the texts of which are ordered to be expurgated, must, within thirty days, deliver lists of the same, and hold said books subject to instructions. The penalty for disobedience is, as usual, excommunication.