I wish to thank Professor E. Percival and the Canterbury University College Council and Library for making available the late Professor Chilton's literature and material, and Mr. Stuart Thomson, of Portobello, for access to the late Mr. G. M. Thomson's notes. I am especially grateful to Professor L. R. Richardson, of Victoria University College, for his advice and encouragement throughout this work, and to Lieut.-Commander Bary, not only for making the material available, but also for the many fruitful discussions on the numerous problems which it involved. Unless otherwise indicated, the station numbers mentioned in the paper all refer to “Lachlan” material. The “Lachlan” stations were located as shown in Chart 1, which is reproduced by courtesy of Lieut.-Commander Bary. Slides mounted from “Lachlan” material are indicated by the letter “L” followed by a serial number, and will be deposited in the Dominion Museum, Wellington. S.O. Hyperiidea The Hyperiidea are a sub-order of pelagic amphipoda, usually semi-transparent, and characterised by their large eyes, lack of a maxilliped palp, and the absence or small size of sideplates on the seven peraeopods. Thirteen families, representing some 33 genera and 58 species, have been recorded from New Zealand. Few of these were known from New Zealand waters before the Terra Nova Report (Barnard, 1930). I have described 15 species below, of which 6 are new records for the New Zealand area. Seven families and 10 genera are represented.