INDEX 



109s 



Eutreptia, 252; viridis, 252 



Excentrosphaera, 153; viridis, 153 



Existence, conditions of, 21-60; bottom mate- 

 rials, 24, differentiation in bottom material, 

 25, distribution of life, 35, in lakes, 23, in 

 Lake Michigan, 35, dormancy, 43, muck 

 bottoms, 26, references, 60, terriginous bot- 

 toms, 26 



Eylaidae, 860 



Eylais, 860; extendens, 860 



Fairy shrimps; see Phyllopoda 



Fasciola, 389; hepatica, 389 



Fasciolidae, 389 



Fasciolinae, 389 



Fascioloides, 389; magna, 389 



Fasciolopsis, 389 



Fauna relicta, 10 



Faxonius, 848 



Ferrissia, 983 



Filaria, 524; amphiumae, 524, ardearum, 524, 

 cingula, 525, cistudinis, 524, helicinus (Pele- 

 citus), 524, nilida, 524, physalura, 525, 

 solitaria, 321, 324, stigmatura, 327, Iriae- 

 nucha, 326, wymanl, 524 



Filariidae, 524 



Filarioidea, 323 



Filaroides, 322; mustelarum, 322 



Filicollis, 548, 331; anatis, SAdiiotulus, 54g, 331 



Fimbraria, 449; plicaia, 449 



Fimbriariidae, 449 



Fishes, Fresh-Water, 1029-1065; adapt- 

 ations, 1039, adjustment to biological en- 

 vironment, 105s, to current, 1033, to light, 

 1034, to temperature, 1030, dispersal, 1037, 

 enemies of, 1061, homes, 1042, migration, 

 1040, nests, 1043, number, 1033, origin, 

 1032, 1033, of adapted faunas, 1064, 

 plankton and fish life, 1082, references, 

 1066, secondary sexual characters, 1047; see 

 Vertebrata 



Fish-flies (SiaUdidae); see Insecta, Neurop- 

 tera, Sialididae 



Fish life, plankton and, 1082 



Flagella, 238 



Flagellate protozoa; see Mastigophora 



Flatworms (Platyhelminthes), 13; free-liv- 

 ing; see Nemertina and Turbellaria; para- 

 sitic; see Parasitic Flatworms 



Fleas, aquatic; see Cladocera 



Flexiphyllum, 274; elongatum, 274 



Flies; black; see Insecta and Simuliidae; 

 damsel, dragon; see Insecta and Odonata; 

 fish; see Insecta and Neuroptera; two- 

 winged; see Diptera and Insecta 



Florideae, 173 



Floscularia, 609; campanuiata, 361, 609, eden- 

 tata, 609, proboscidea, 609, uniloba, 609 



Floscularida, 372, 609 



Flosculariidae, 372, 609 



Flowing waters, 2 



Fluctuations in numbers of organisms, 34 



Flukes; see Trematoda 



Fluminicola, 991; nuUalliana, 991 



Food relations of aquatic animals, 53, 34 



Foraminifera, 232 



Fordyce pump, 79 



Fragilaria, 132; crotonensis, 132 



Fragilariaceae, 132 



Franceia, 155 



Fredericella sultana, 932 



Free-living flatworms; see Nemerteans and 

 Turbellaria 



Free-living nematodes; see Nematoda, free- 

 living 



Free-living Roundworms: see Nematoda, free- 

 living 



Fresh-water algae, biology, life, etc.; sec Al- 

 gae, Biology, Life, etc.. Fresh-water 



Frontipoda, 868; museulus, 868 



Frontonia, 280; leucas, 280 



Funiculus, 948 



Furcocercous cercariae, 422 



Furcularia, 589; forficula, 389, longiseta, 589 



Fusconaia, 997 



Fyke nets, 63 



Gadinia, 980; reticulata, 980 



Gadiniidae, 980 



Galba, 982 



Galerucella (larva), 943 



Gametes, 119 



Gammaridae, 842 



Gammarus, 843; Umnaeus, 843 



Gases, dissolved in water, 36, distribution, 37, 

 solubility, 37 



Gasterostomata, 379 



Gasterostomous cercariae, 412 



Gasterostomum, 379 



Gastropoda, 970, 977; see Mollusca 



Gastropodidae, 370, 603 



Gastropus, 603 ; hyptopus, 603, slylifer, 399, 603 



Gastrostyla, 289; stcinii, 289 



Gastrotricha, fresh-water, 16, 621-631; dis- 

 tribution, 624, excretory organs, 623, key, 

 624-630, locomotion, 622, references, 631. 

 structure, 621 



Geminella, 163 



Genicularia, 133; spirotaenia, 133 



Geoplana nigrojusca, 360, stolli, 360 



Geoplanidae, 360 



Gerda, 292; sigmoides, 292 



Gerridae, 933 



Gigantorhynchiis hirudinaceus, 342 



Gillia, 991; aUilis, 991 



Gill nets, 64 



Glass, water, 87 



Glaucoma, 280; scinlillans, 280 



Glebula, 1017; rotundata, 1017 



Glenocercaria, 413 



