CAB/LEG/24.1 Page 9 (5) (c) which shall be on a standard form, as may be arranged under Article XVI. make the import and transit of such specimens and trophies subject to the presentation of the authorization required under section (b) above, with due provision for the confiscation of specimens and trophies exported illegally, without prejudice to the application of other penalties. Article X Conservation Areas 1. The Contracting States shall maintain and extend where appropriate, within their territory and where applicable in their territorial waters, the Conservation areas existing at the time of entry into force of the present convention and, preferably within the framework of land use planning programmes, assess the necessity of establishing additional conservation areas in order to: (a) protect those ecosystems which are most representative of and particularly those which are in any respect peculiar to their territories; (b) ensure conservation of all species and more particularly of those listed or may be listed in the annex to this convention. Article XV Organization of National Conservation Services Each Contracting State shall establish, if it has not already done so, a single agency empowered to deal with all matters covered by this Convention, but, where this is not possible a co-ordinating machinery shall be established for this purpose. Article XVI Inter-State Co-operation 1. The Contracting States shall co-operate: (a) whenever such co-operation is necessary to give effect to the provisions of this convention, and (b) whenever any national measure is likely to affect the natural resources of any other State.