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 BOTANY DiATOMACEAK (rOllt.) Tryblionella marginata, W. Sm. Nitzschia angularis, W. Sm. — longissima, Ralfs — closterium, W. Sm. Surirella Gemma, Ehren. Campylodiscus Hodgsonii, W.Sm. — parvulus, W. Sm. Podosphaenia Ehrenbergii, Kutz. Rhipidophora elongata, Kutz. — paradoxa, Kutz. .-mphitetrasantediluviana,Ehren. Grammatophora marina, Kutz. Rhabdonema arcuatum, Kutz= — minutum, Kutz. Among the few other fresh- water Algae known to occur are the following : — Rhodophyceae Lemanea torulosa, Ag. Batrachospermum moniliforme Ag. — vagum, Ag. Chlorophyceab Bulbochaete setigera, Ag. Oedogonium vesicatum, Wittr. Chaetophora pisiformis, Ag. — cornu-damae, Ag. — tuberculosa, Ag. Chlorophyceae (cent.) Ulothrix zonata, KUtz. — rivularis, Kutz. — parietina, KUtz. Myxonema tenue, Rabenh. Draparnaldia glomerata, Ag. Trentepohlia aurea, Mart. Enteromorpha intestinalis, Link. Prasiola crispa, Menegh. — furfuracea, Menegh. Chaetomorpa linum, KUtz, Cladophora fracta, Kutz. — glomerata, Ktltz. Vaucheria sessilis, var. caespitosa, Raben. — dichotoma, Ag. — geminata, DC. — ornithocephala, Hass. — terrestris, Lyngb. ■ — Dillwynii, Ag. Mougeotia genuflexa, Ag. Spirogyra nitida. Link, — decimina, Kutz. — quinina, Kutz. — pellucida, Kutz. Zygnema pectinatum, Ag. — cruciatum, Ag. — ericctorum, Hansg. Pleurotaenium "truncatum. Nag. Closterium 'Dianae, Ehren. — 'striolatum, Ehren. — 'Kutzingii, Brib. — Lunula, Nitzsch. Cosmarium 'Botrytis, Meneg. Chlorophyceae {cone.) Hyalotheca dissiliens, Breb. Volvox globator, Ehren. Pleurococcus vulgaris, Meneg. Hydrodictyon utriculatum. Roth. Scenedesmus quadricauda, Breb. Pediastrum Boryanum, Meneg. Palmella botryoides, Kiitz. Gloeocystis *gigas. Lager Hydrianum *heteromorphum, Reinsch. Tetraspora, lubrica. Roth. Ophiocytium cochleare, A. Br. Tribonema 'bombycina, Derb. and Sol. Myxophyceae Porphyridium cruentum. Nag. Tolypothrix distorta, Kutz. Anabaena Flosaquae, Breb. Lyngbya ochracea, Thur. Phormidium autumnale, Go- mont. Oscillatoria tenuis, Ag. — nigra, Vauch. — limosa, Ag. Nostoc sphaericum, Vauch. — coeruleum, Lyngb. — commune, Vauch. — pruni forme, Ag. — *microscopicum, Carm. Gloiotrichia natans, Ag. MARINE ALGAE The coast of Suffolk, like that of the neighbouring counties of Norfolk and Essex, is singularly unfavourable to the growth of marine algae. Few if any rocks are accessible even at the lowest tides, and the shifting shingle and sand which form the greater part of the fore- shore of the county offer no secure anchorage for marine plants. The larger sea-weeds (e.g. Laminaria hyperborean Saccorhiza polyschides, Sec.) are entirely wanting, whilst the bladder- wracks {Fuci), which are such conspicuous objects on all our rocky coasts, are found in comparatively small quantity, and usually more or less dwarfed and stunted where they occur within the limits of the county. Many brackish-water species are to be met with at the mouth of the River Yare and at the influx of the Stour and Orwell. Great musses of Enteromorphae, Ulvae, Chaetomorphae, &c., are always to be seen floating in the water or stranded on the mud when the tide recedes ; whilst the dreary salt-marshes which fringe the estuaries produce their crop of Osdllatoriae and other Myxophycea, which are of great interest to the algologist, but I fear not very attractive to the ordinary collector. It is useless to attempt to trace the distribution within the county of the species recorded, for whilst a few of them were gathered from the rocks at Felixstowe and elsewhere, by far the greater number were found amongst the rejectamenta on the beach. No doubt many of them had been detached from submerged rocks in the immediate vicinity of the spot where they were found, but others showed clearly by their battered condition that they had drifted from some more distant locality. The amount of sea-wrack cast up at any point on the Suffolk coast is never very great, and so far as I am aware the farmers of the county do not trouble to collect it for manure, as is usually done in counties where sea-weed is found in abundance. 77