THE MOLLUSCA OF THE PAREORA AND OAM ARU SYSTEMS OF NEW ZEALAND. By Captain F. W. Hutton, Hon. Mem. Linn. Soc. of N. S. Wales. The correlation of the Tertiary rocks of Australia with those of New Zealand is one of considerable interest, but one on which, as yet, no well grounded opinion has been given. As a contribution towards arriving at correct ideas on the subject, I offer to the Society a list of the Mollusca of the Pareora and Oamaru Systems in New Zealand, which are probably of Miocene and Oligocene age. The list is by no means complete as no catalogue of the large collections brought to the Wellington Museum since 1873 has been published ; but it is fuller than any previous list, as it includes, for the first time, the Tertiary Mollusca in the Canterbury Museum collected by Dr. von Haast, between 1862 and 1875, during his geological survey of Canterbury, and those collected by myself in 1874-5 when I was surveying Otago. The nomenclature also has been carefully revised. The list contains 268 species, of which 184 are confined to the Pareora System, 33 to the Oamaru System, and 51 are common to both. But of this latter number a few are doubtful. Evidently the two systems are closely related palseontologically, but they are separated stratigraphically by an unconformity which is almost always present. The Geological Survey divides the Pareora System into upper and lower miocene, the blue clay of Wanganui being in-cluded in the upper division. But I have elsewhere shewn that this blue clay belongs to the Wanganui System (1), and, this being (1) Trans. N.Z. Institute, Vol. 18. The Wanganui System.