That all persons claiming title to, or ownership of, any lands involved in any such suit, or suits, may in addition to any other legal or equitable defenses which they may have or have had under the laws of the Territory and State of New Mexico, plead limitation of action, as follows, to wit:“(a) That in themselves, their ancestors, grantors, privies, or predecessors in interest or claim of interest, they have had open, notorious, actual, exclusive, continuous, adverse possession of the premises claimed, under color of title from the 6th day of January, 1902, to the date of the passage of this Act, and have paid the taxes lawfully assessed and levied thereon to the extent required by the statutes of limitation, or adverse possession of the Territory or of the State of New Mexico, since the 6th day of January, 1902, to the date of the passage of this Act, except where the claimant was exempted or entitled to be exempted from such tax payment.
“(b) That in themselves, their ancestors, grantors, privies, or predecessors in interest or claim of interest, they have had open, notorious, actual, exclusive, continuous, adverse possession of the premises claimed with claim of ownership, but without color of title from the 16th day of March, 1889, to the date of the passage of this Act, and have paid the taxes lawfully assessed and levied thereon to the extent required by the statutes of limitation or adverse possession of the Territory or of the State of New Mexico, from the 16th day of March, 1899, to the date of the passage of this Act, except where the claimant was exempted or entitled to be exempted from such tax payment.“Nothing in this Act contained shall be construed to impair or destroy any existing right of the Pueblo Indians of New Mexico to assert and maintain unaffected by the provisions of this Act their title and right to any land by original proceedings, either in law or equity, in any court of competent jurisdiction and any such right may be asserted at any time prior to the filing of the field notes and plats as provided in section 13 hereof, and jurisdiction with respect to any such original proceedings is hereby conferred upon the United States District Court for the District of New Mexico with right of review as in other cases: Provided, however, That any contract entered into with any attorney or attorneys by the Pueblo Indians of New Mexico, to carry on such litigation shall be subject to and in accordance with existing laws of the United States.