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the invention of
p 25 Transparency p 26 Stratification
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abdomen abundant adapted adult algae animals appear attached basins beautiful beds beetles Biological bladderwort body bottom burrow caddis-flies caddis-worms carnivorous cat-tail Cayuga Lake cells colonies color common Copepods cover crustaceans damselflies depth desmids Diagram diatoms distribution dragonfly eggs entomostraca feed feet figure filaments fishes flagella flagellates flat flatworms floating forage fresh water fresh-water gelatinous gills glochidia green groups grow growth habits herbivores Hexagenia Illinois River insects Ithaca land larger larvae legs less limnetic live mainly marsh masses mayflies meters microscope midge larvae mosses mussels nymphs open water organisms Ostracods oxygen pair plancton plants pond pondweed pools pupae rotifers season sessile shell shelter shoals shore shown side silt slender snails soft soil solid support species sphagnum statoblasts stems stoneflies stones streams submerged summer surface swimming temperature terrestrial tion transparent tubes valve vegetation water culture water-fleas winter