The Metamorphic and Plutonic Rocks of Lake Manapouri, Fiordland, New Zealand—Part III. By F. J. Turner, University of Otago. [Read before the Otago Branch, April, 1937; received by the Editor, February 5, 1938; issued separately, June, 1938.] Contents. Introductory Summary. The Trondhjemitic Granites and Associated Gneisses. The Pomona Island Granite and Associated Gneisses, etc. Structure and Tectonics. Fabric Analysis of Foliated Pomona Granite. Acknowledgements. Literature Cited. Introductory Summary. In the first two papers of this series (Turner, 1937, 1937a) an account was given of the metamorphic and intrusive rocks exposed in the northern, western and central portions of Lake Manapouri. Subsequently, with the assistance of a grant from the research funds of the Australian and New Zealand Association for the Advancement of Science, the writer has been able to complete the survey of the pre-Tertiary rocks of Manapouri by field work along the shores of South and Hope Arms and the intervening southern coast of the lake (Fig. 1). This paper embodies the results obtained during this later work, together with a summary of the structural features of the area as a whole. That part of the lake here mapped lies mainly within the Eastern Manapouri Province as defined in Part I, and the rocks there exposed fall within the same stratigraphic units as described earlier, viz. (in order of decreasing age): (a) basal gneisses (Holmwood Island Gneisses), correlated with Professor Park's Dusky Sound Series; (b) Beehive epidiorite; (c) Pomona Island granite and hybrid derivatives; (d) Tertiary sandstones and conglomerates. However the white trondhjemitic granites of the Western Province, accompanied by minor amounts of the invaded basement gneiss, are exposed continuously along the west shore of South Arm, and there form the eastern margin of the great injection-complex described in Part 2. Nowhere has the trondhjemitic granite been observed in contact with either the epidiorite or the Pomona Island granite, so that the relative age of the three groups of rocks remains rather uncertain (cf. Turner, 1937a, pp. 244, 245). The Trondhjemitic Granites and Associated Gneisses. Along the western shores of South Arm granitic rocks greatly preponderate over the invaded gneisses, the occurrence of which is limited to large blocks often several yards in diameter enclosed locally in the intrusive member of the complex.