west was observed. The dip of the sandstones near 2 is not actually seen. The grit here is about 8ft. thick. Lapilli however, are rare in it, and in some respects its general appearance does not resemble that of the grit. This may be due simply to the fact that it is a very westerly outcrop. On the other hand, it is possible that the bed seen here is a distinct one, possibly an outcrop of the Ponsonby tuff, to be presently described. 7. The Other Volcanic Beds. Having dealt at length with the Cheltenham breccia and the Parnell grit, something must be said of the other volcanic beds. I have already said that I do not consider the coarse breccias containing Bryozoa as all identical beds, but find it impossible at present to distinguish between them. The finer tuffs of the same, or nearly the same, age may, however, be separated. Two of them are here described as the Wairau tuffs and the Ponsonby tuff. I should also mention that other beds contain occasional volcanic fragments, but not enough to constitute them tuffs. The Orakei greensand is a very good instance, for in that bed patches of scoriaceous lava the size of a pin's head may be detected with a lens. On the shores of the Tamaki, near Panmure, there are also pumice sands, but I believe these are Pliocene or later beds, unconformable to the Waitemata series, and derived from the pumice plateau in the centre of the North Island. The Waitakerei breccias and conglomerates on the west coast and therefore on the other side of the vents, I have not visited; but they must, I believe, be classed with the Waitemata series. It is interesting to compare the Wairau tuffs with that formed at the eruption of Tarawera. Except that the former were submarine, the resemblance is considerable; but, judging from their thickness and distance from the vent, the eruptions which produced them were larger. It is interesting to note that there are three or four tuffs separated in each case by a few inches of shale, so that the eruptions succeeded each other at only short intervals. These eruptions took place some time after those which produced the Cheltenham breccia, and were not, apparently, so violent. Wairau Tuffs. I have given this name to volcanic beds which are best developed at the Wairau Creek, near Lake Takapuna. There are really several beds, each separated from the next by a thin layer of shale. The distinction between a tufaceous sandstone and a sandy tuff is not very easy to draw, and some of these beds are decidedly sandy. The lowest, however, is