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A NOTE ON THE USE OF THE IDENTIFICATION GUIDE
INDEX TO GENERA AND SPECIES
21 Centropyxis 37 Nebela Ambleside Arcella arranged in imbricated cell Centropyxis aerophila Chardez chrysomonad circular in plan circular plates arranged circular pseudostome collar Colour colourless or yellow common in soils composed of approximately Cumbria Cyclopyxis cytoplasm Deflandre Diameter diatom frustules Difflugia Ehrenberg elongated endosymbiont Euglypha exosomes Ferry House flask-shaped test Foissner freshwater and soil Freshwater Biological Association habitats Heleopera Hyalosphenia imbricated rows ingested invaginated key to freshwater lateral elevation laterally compressed leading edge Leidy Length Lesquereusia litter worldwide median tooth moss habitats narrowest end Natural Environment Nebela Nebela collaris organic cement oval plates arranged oval pseudostome ovoid test particles Penard Plagiopyxis Protozoa pseudopod pseudopodia pseudostome area pseudostome is located Rhizopoda rough-surfaced test sand grains Schwabia silica smooth soils and litter species is common spines subterminal pseudostome tapering test is composed test is laterally test is ovoid Testacea testate amoebae testate species Trinema lineare vacuoles yellow to brown