Art. XLIX.—The Mollusca of the Kermadec Islands. By W. R. B. Oliver. [Read before the Auckland Institute, 16th December, 1914.] Plates IX–XII. The Kermadec Islands form an isolated group in the south-west Pacific Ocean, situated about midway between New Zealand and the Tonga Group. They extend from Sunday Island, in S. lat. 29° 15', W. long. 177° 59′, about S. 22° W. to French Rock, 227 km. distant. Besides these, in the intervening space, and almost in direct alignment, are Macauley Island and Curtis Island. The present paper is based mainly on a collection of shells made by R. S. Bell at Sunday Island during 1909 and 1910. I have also had at my disposal a portion of the collection made by the expedition to the Kermadecs in 1908; while Mr. T. F. Cheeseman, F.L.S., F.Z.S., Curator of the Auckland Museum, has kindly allowed me to look over the shells from the Kermadec Islands belonging to the institution under his charge. A number of specimens of Nudibranchs, Aplysioids, Cerithiidae, and other small marine shells still remain to be described. Altogether 261 species, including three found only as fossils in the Kermadecs, are enumerated in the present list, made up as follows: Species already recorded (including four described as new in this paper, but hitherto referred to already-described species)—Amphineura, 8; Gastropoda, 129 (1 fossil); Lamellibranchia, 25; Cephalopoda, 16. Species already described and now recorded for the first time from the Kermadec Islands—Gastropoda, 36 (2 fossil); Lamellibranchia, 5. New species—Gastropoda, 37; Lamellibranchia, 5. In the preparation of this paper I have received considerable help from Mr. C. Hedley, F.L.S., of Sydney, to whom I showed a portion of my collection when passing through Sydney in October, 1913. For his invaluable aid, freely given, I beg now to tender my sincere thanks. Mr. T. Iredale, M.B.O.U., of London, has also helped in many points by consulting literature and specimens not available to workers in New Zealand. And I have to thank Mr. H. Suter, of Christchurch, for clearing up a number of points which I submitted to him. I trust the information I intended to give under each species is clearly stated, but to avoid all misunderstanding the following explanation of the plan of the systematic account is given. In the case of already-described species the reference to the original description is given immediately after the name of the species, and for those species already recorded from the Kermadecs the reference to the work where first so recorded is given. Where no such reference is given it signifies that the species is now recorded from the Kermadec Islands for the first time. With new species I have in all cases described in full a single specimen, the type, which in every case has been deposited in the Canterbury Museum, Christchurch. Also, in all cases of new species the type specimen has been figured. “Habitat” is used strictly in the sense in which it is employed by ecologists—namely, as meaning the station