Pelagic Amphipods of the Sub-Order Hyperiidea in New Zealand Waters* This is No. 11 of the series “Studies on the New Zealand Amphipodan Fauna,” and is part of an investigation carried out at the Zoology Department, Victoria University College, Wellington, during the tenure of a New Zealand University Research Fund Fellowship. I.—Systematics By D. E. Hurley [Received by the Editor, August 11, 1954.] Abstract Fifteen species of Hyperiidea from New Zealand waters are re-described and figured. Six of these, Cyllopus macropis, Hyperia spinigera, Parathemisto gracilipes, Hyperoche mediterranea, Paralycaea gracilis and Parascelus typhoides? are new records from the New Zealand region. Cyllopus macropis is considered a vahd species. Fifty-eight species of Hyperiidea are known from these waters; keys are given to all families, genera and species represented. Parathemisto gracilipes, P. gaudichaudi and P. australis cannot be separated definitively on differences established by measurement, but the three species are considered distinct on morphological and ecological grounds. The material dealt with represents all of the Hyperiid material available in New Zealand at the time of study. Introduction and Acknowledgments Plankton collections made along the New Zealand coast during 1951 by the Survey ship H.M.N.Z.S. Lachlan, under the command of Commander J. M. Sharpey Schafer, R.N., have resulted in large collections of valuable zoological material. At the invitation of Lieut.-Commander B. M. Bary, R.N.Z.N., I undertook identification of amphipod material from these collections. This paper details the Hyperiid amphipods from waters around the New Zealand coast, especially the south-east of the South Island, and south to the Subantarctic Islands. For the purposes of this paper I have followed Barnard (1930) and included specimens taken in subantarctic waters south to latitude 60° in the New Zealand fauna. This includes the Campbell Island region. Since it soon became obvious that the collections were far more extensive than any previous Hyperiid collections in New Zealand waters with the possible exception of “Terra Nova “material, I took the opportunity to include all other Hyperiid material to which I had access. Because of the importance of the Hyperiidea oceanographically, I have given a check list and keys to all species recorded from New Zealand waters. Also, since the material embraces all previous species recorded from New Zealand, again with the sole exception of “Terra Nova “collections, which were excellently dealt with by Barnard (1930), I have found it a very convenient basis for a complete revisory account of the New Zealand Hyperiidea. A number of important ecological and distributional conclusions which have resulted from the systematic studies will be discussed in a later paper by Lieut.-Commander Bary.