and they occupy the same relative position with respect to the “Kurow schists” that the Te Anau series does to the Kakanui series. In his “Outlines of New Zealand Geology” Sir James Hector recognised the close association, of the Te Anau and Kakanui series, and referred them to the Devonian period, as under:—* Hector, “Outlines of New Zealand Geology,” 1886, p. 40. “XIII. Devonian. “(a.) Te Anau series. “(b.) Kakanui series.” In the latest classification of the Geological Survey,† Reps. Geol. Expl., 1886–87, Appendix, p. 256. dated the 30th June, 1887, the Kakanui series disappears from the table of formations, and is apparently, but without explanation, included in “XIII. Lower Devonian— Reefton beds,” which had no existence in the classification of the previous year (“Outlines of New Zealand Geology,” p. 40). Briefly summarising the foregoing, we find that the highly altered phyllites and quartzites of the lower flanks of the Kurow Mountains are succeeded conformably by the less altered Mount Mary fossiliferous slates and sandstones. The former are included in the Kakanui series of Hector and Hutton, and the latter in the Kaikoura formation of Hutton And Te Anau series of Hector. I am inclined to agree with the early opinion of Hector and Hutton that the “Kurow schists,” notwithstanding that they pass insensibly into the Mount Mary series, are sufficiently distinctive to be separated from the upper series. For the lower and more altered group of Kurow rocks I propose to revive the old “Kakanui series” of Hector, in which they were originally included. For the upper and less altered group I do not think there is a more appropriate name than Mount Mary series. The Mount Mary series undoubtedly includes the Te Anan series of the Geological Survey, of supposed Devonian age, but there are several reasons why the name “Te Anau” should be abandoned. In the first place, we have it on the authority of Mr. McKay that the rocks typical of the Te Anau series do not occur at Lake Te Anau; and, further, the Te Anau series has always been difficult to distinguish from rocks supposed to belong to the Maitai series of; the Geological Survey. On the other hand, the rocks at Mount Mary are fossiliferous, and perhaps this is the best reason for attaching the name of that mountain to the new series. The proposed subdivisions of this succession of rocks are as follows:—