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 A HISTORY OF CORNWALL Crouania attenuata, J. Ag. Devon, Channel Islands Desmarestia Dresnayi, Lamour. Devon, Ireland Ectocarpus Stilophorae, Crn. Dorset Erythropeltis discigera, Schm. Kent ciliaris, Batt. Scotland Gelidium sesquipedale, Thur. Devon Griffithsia Devoniensis, Haw. Haematocelis rubens, J. Ag. Northumber- land Helminthocladia Hudsoni, J. Ag. Devon Nitophyllum literatum, J. Ag. Devon Monostroma crepidinum, Farl. Sussex orbiculatum, Thur. Dorset Peyssonelia atropurpurea, Crn. Channel Islands Harveyana, Crn. Devon Rosenvingii, Schm. Devon, Dorset, Northumberland Polysiphonia ceramiiformis, Crn. Dorset foetidissima, Cocks. Devon, Sussex Rhunensis, Thur. Devon Rhodophysema Georgii, Batt. Devon Stenogramme interrupta, Mont. Devon, Ireland CYANOPHYCE^E CHAM./ESIPHONACE.S: Dermocarpa prasina, Born. Padstow OSCILLATORIACEJE Oscillatoria margaritifera, Ktttz. Saltash Phormidium papyraceum, Gom. Saltash, Penzance autumnale, Gom. Padstow, Falmouth, Penzance Lyngbya majuscula, Harv. Marazlon Symploca hydnoides, Ktitz. Saltash, Fowey, Padstow, Penzance Microcoleus chthonoplastes, Thur. Looe RIVULARIACE.S Calothrix parasitica, Thur. Forth Cressa, Sally Isles seruginea, Thur. Padstow Rivularia Biasolettiana, Menegh. Wade- bridge, Padstow, Falmouth, Penzance nitida, C. Ag. Saltash, Padstow, Hayle, Marazlon bullata, Berk. Looe, Fowey, St. Minver, Marazlon NOSTOCACE;E Anabaena variabilis, Ktttz. Hayle, Penzance torulosa, Lagenh. Penzance CHLOROPHYCE.& ULVACE.S: Monostroma laceratum, Thur. Wade- bridge, Lostwithiel, H. 15 Wittrockii, Born. Saltash, Fowey Grevillei, With. Falmouth Enteromorpha clathrata, J. Ag. Cawsand, Falmouth, Penzance Linkiana, Grev. Padstow, Fowey, Looe prostrata, Le Jol. Looe, Falmouth Hopkirkii, Mac Calla. Looe Linza, J. Ag. Looe, Penzance erecta, J. Ag. Whitsand Bay, Fowey, Falmouth torta, Reinb. Wadebrldge ULVACE/E (continued') Enteromorpha ramulosa, Harv. Falmtuth ; St. Martin's, Scllly Isles var. tenuis, Hauck. Scilly Isles Isles Ulva lactuca, Linn. Falmouth (rare) myriotrema, Born. ULOTHRICHACE^E Ulothrix *speciosa, Kotz. Mount's Bay implexa, Kiitz. Looe CHJETOPHORACEJE Tellamia *contorta, Batt. Padstow, Fal- mouth CLADOPHORACE.S Urospora isogona, Batt. Par, Penzance Chaetomorpha tortuosa, Kutz. Looe, Fowey, Falmouth, Mount's Bay sutoria, Berk. Penzance Melagonium, Kutz. St. M Inver, New- quay, Lizard, Mount's Bay ; Tresco, Scllly Isles Rhizoclonium implexum, Batt. Mount Edgcumbe, Penzance arenosum, Ktttz. Talland Bay arenicola, Reinb. Marazlon var. Casparyi, Holm. & Batt. Pad- stow, Falmouth, Penzance Cladophora pellucida, Ktttz. Looe, Fowey, Falmouth, Penzance Hutchinsiae, Harv. Fowey, Falmouth, Scilly Isles diffusa, Holm. & Batt. Falmouth Scllly Isles hirta, Ktttz. Looe, Fowey, Falmouth, Penzance, Land's End utriculosa, Kutz. Scllly Isles gracilis, Ktltz. Looe, Falmouth, Penzance sericea, Ktttz. Looe, Padstow, Fowey, Falmouth, Penzance Penzance 84
 * crepidinum, Farl. Falmouth
 * orbiculatum, Thur. Falmouth
 * usneoides, J. Ag. St. Martin s, Scllly
 * intricata, Batt. Padstow, Falmouth
 * rectangularis, Harv. Whitsand Bay,
 * trichocoma, Kutz. Falmouth
 * glaucescens, Harv. Looe,- Falmouth,