two regions, either near Napier on the east coast or Otaki on the west. In addition, I have from these places a number of the Desmids described by Nordstedt. The following plants should therefore have habitats attached to them as follows:— Hawke's Bay.—Sphærozosma excavatum, Cosmarium minutum, Cosm. sexangulare, Cosm. arctoum, Cosm. blyttii, Cosm. repandum, Cosm. pseudopyramidatum, Xanthidium fasciculatum β perornatum, Staurastrum sub-denticulatum, Staur. sebaldi, Staur. sagittarium, Staur. renardi, Penium polymorphum, Closterium brébissonii. Otaki.—Hyalotheca dissiliens, Hyal. hians, Bambusina borreri, Aptogonum undulatum, Sphærozosma excavatum, Sphær. pulchellum, Phymatodocis nordstedtiana, Onychonema filiforme, Micrasterias decemdentata var. upsaliensis, Micr. papillifera, Euastrum ansatum, Eu. longicolle, Eu. cuneatum, Eu. sphyroide, Cosmarium sexangulare, Cosm. arctoum, Cosm. trilobulatum var. basichondrum, Cosm. nitidulum, Cosm. (Euastrum) sublobatum, Cosm. punctulatum, Cosm. subpunctulatum, Cosm. obsoletum var. punctatum, Cosm. pseudopachydermum, Cosm. turgidum, Cosm. pseudopyramidatum, Cosm. sublatum, Cosm. venustum, Cosm. genuosum, Cosm. quadratum, Cosm. exiguum, Cosm. amænum var. mediolæve, Xanthidium smithii var. variabile, Xanth. armatum var. basidentatum, Xanth. fasciculatum var. peronatum (forma supernumeraria), Xanth. intermedium, Xanth. simplicius, Xanth. dilatatum, Xanth. octonarium, Arthrodesmus incus, Staurastrum muticum, Staur. corniculatum var. variabile, Staur. sub-denticulatum, Staur. tetracerum, Staur. sexangulare, Staur. sebaldi, Staur. pseudosebaldi, Staur. spencerianum, Staur. dejectum, Staur. sagittarium, Tetmemorus brébissonii, Penium digitus, Pen. margaritaceum, Pen. closterioide, Pen. lamellosum, Pen. polymorphum, Docidium ehrenbergii, Doc. nodosum, Doc. rectum, Triploceras tridentatum var. superbum, Tripl. gracile var. aculeatum, Tripl. gracile var. bidentatum, Spirotænia condensata, Closterium selenæum, Clost. striolatum, Clost. lineatum var. sandvicense, Clost. lunula, Clost. gracile, Clost. decorum, Clost. kützingii, Clost. ehrenbergii, Clost. acerosum, Clost. acutum, Clost. intermedium. My thanks are due to Professor Nordstedt; to Mr. W. Barwell Turner, of Leeds; to Herr G. Lagerheim, of Stockholm; and others, who have kindly assisted me with advice, figures, and specimens; and also to Mr. C. W. Lee, of Otaki, who has been assiduous in forwarding to me gatherings from that place in which occur many of the plants mentioned in these pages.