[Read before the Otago Institute, 10th November, 1891.]

During the six years that have elapsed since the publication of a critical list of the New Zealand Amphipoda and Isopoda by Mr. G. M. Thomson and myself,^* much new material has been collected of which no account has yet been published, while the publication of the reports on the “Challenger” Isopoda and Amphipoda, by Beddard and Stebbing respectively, has shown that there are many things that need alteration in the nomenclature of the species already known, and many points concerning them that require more fully working out. To do this properly it would be necessary to begin at the beginning of the list, and to take the species one by one and work each out fully. This, however, would be a work of very considerable magnitude, and would require the continuous attention of the worker for a long time. In the present paper I shall content myself with giving a number of miscellaneous additions to our knowledge on the subject. I describe some new forms, record others already known elsewhere, but new to New Zealand, and draw attention to a few of the changes and additions made in the “Challenger” reports.

For material, besides what I have collected myself, I am indebted to Mr. R. M. Laing, of the Boy's High School, Christ-church; to Mr. H. Suter, of Christchurch; and particularly to Mr. G. M. Thomson, Science Master of the Dunedin High Schools, who, feeling unable at the present time, through pressure of other matters, to work at the subject himself, has very kindly handed over to me all the undescribed Amphipoda and Isopoda in his collection, together with many of his own notes and drawings. Among the specimens that I have thus received are many collected by Mr. J. F. Erecson, of Waipa-papa Point, and by Mr. F. S. Sandager, of Mokohinou, both of whom have in this way rendered valuable assistance. Only a small part of the material thus placed at my disposal has been used in the preparation of this paper; I hope to be able to make use of the remainder on some future occasion.

In the case of species previously described, I have endeavoured as far as possible to give the reference to our Critical List,* and to any papers published since, but I have