1098 



INDEX 



Ilyocryptus, 712; aculifrons, 713, halyi, 713, 

 longiremis, 713, sordidus, 712, spinijer, 713 



Ilyocypris, 809; bradyi, 810, gihba, 809 



liyodriluB, 641 



Ilyodromus, 810; pectinatus, 810 



Incrustation on aquatic plants, 1 85 ; car- 

 bonate of lime, 187, gelatinous covering, 

 187 _ 



Inefi&giata, 149 



Infusoria (Ciliate Protozoa), Fresh-water, 14, 

 238-243, 271-300; cilia, 238, 239, ciliate 

 protozoa, 238, conjugation, 242, key, 

 271-300, methods of study, 242, physiolog- 

 ical processes, 241, references, 300, repro- 

 duction, 241, structure, 239; see Protozoa 



Insecta, aquatic, 17, 876-946; adaptation to 

 water, 876, of larvae to aquatic life, 878, 

 keys, 917-946; of adults, 934-935, 937-942 

 of imagos, 918-921, 922-927; of larvae, 

 917. 935-936, 943-946; of nymphs, 921-922, 

 928-932; recognition of characters, 880, 

 references, 946, wing venation, 916; see 

 Coleoptera, Diptera, Ephemerida, Hemip- 

 tera, Lepidoptera, Neuroptera, Odonata, 

 Plecoptera, Trichoptera 



Intermediate host; see Host 



[nvestigators in Fresh- Water Biology, 11 



lo, 992; spinosa, 992 



Iota, 482; octangulare, 482 



Ironus, 486; americanus, 486 



Ischnura (imago), 924, (nymph), 929; verti- 

 calis, 893 



Isopoda, 829, 841; see Malacostraca 



Jaws (trophi) of rotatoria, 559 

 Jensenia, 348; pinguis, 348 

 Tournals on Fresh-Water Biology, 20 



Kerona, 287; pedicuhis, 287 



Keys to Fresh-Water Biology; Algae, Blue- 

 Green (Cyanophyceae), 104-114, Algae, 

 excl. of Blue-Green, 125-177, Acanthoceph- 

 ala, 545-551, Animalcules, 587-619, 951- 

 955, Arguhdae, 787-788, Bacillariaceae, 

 125-134, Bryozoa, 951-955, Chlorophyceae, 

 134-174, Cestoda, 429-451, Cladocera, 689- 

 739> Copepoda, 755-782, 784-786, 787-788, 

 Coleoptera, 937-943, Diptera, 943-946, 

 Ephemerida, 918-922, Ergasilidae, 784-786, 

 Gastrotricha, 624-630, Gnathostomata, 

 755-782, Gordiacea, 537-542, Hemiptera, 

 933-934, Hirudinea, 651-660, Hydra, 320- 

 322, Hydracarina, S59-874, Hydrozoa, 

 320-322, Infusoria, 271-300, Insecta, 917- 

 946, Mollusca, 977-1020, Malacostraca, 

 841-850, Mastigophora, 243-270, Nema- 

 toda, Free-Living, 482-505, Nematoda, 

 Parasitic, 520-535, Neuroptera, 934-936, 

 Odonata, 922-932, Oligochaeta, 638-644, 

 Ostracoda, 806-827, Phaeophyceae, 174- 



175, Porifera, 306-315, Protozoa, 2i9-236» 

 243-300, Phyllopoda, 666-675, Rhode- 

 phyceae, 175-177, Rotatoria, 587-619, 

 Sarcodina, 219-236, Trichoptera, 936-937. 

 Trematoda, 374-424, Turbellaria, 333-364 



Kirchneriella, 151; obesa, 152 



Koenikea, 865; concava, 865 



Krendowskija, S63; ovata, 863 



Kurzia, 71 8; latissima, 718 



Labidestes siculus, 1036 



Laccobius (adult), 939 



Laccophilus (adult), 940 



Lacinularia, 617; socialis, 561, 575, 617 



Lacrymaria, 274; olor, 274 



Ladona (imago), 927, (nymph), 932 



Laevapex, 985 



Lagenophrys, 297; vaginocola, 297 



Lagerheimia, 154; genevensis, 154 



Lakes, 2, 4, 5; age series, 49, circulation of 

 water in, 27, conditions of existence in, 23, 

 in Lake Michigan, 35, epilimnion, 28, hypo- 

 limnion, 28, 38, thermocline, 28, 38, waves 

 and their action, 28 



LamelUbranchia, 970, 994; see Mollusca 



Lamprothamnus, 174 



Lampsilinae, 1007 



Lampsilis, 1009; ovata, loio, recta, loii, 

 lexasensis, ion; s. s., loio 



Land planarians; see Turbellaria 



Lanthus (imago), 924, (nymph), 929 



Lanx, 986; newberryi, 986 



Lara (adult), 942 



Lasmigona, 1005 



Lastena, 1002; lata, 1002 



Lateriporus, 444 



Lathonura, 716; rectirostris, 716 



Latona, 689; parviremis, 690, setifera, 690 



Latonopsis, 691; Jascictdata, 692; occiden- 

 talism 691 



Lebertia, 867; duhia, 867, tau-insignita, 867 



Lebertiinae, 867 



Lechriorchis, 407; elongatus, 407, primus, 407 



Lecithophora, 340, 361 



Lecquereusia, 222; epistomium, 223, jnodesta, 

 222, spiralis, 223 



Leeches; see Hirudinea 



Lemanea, 175; toruiosa, 175 



Lembadion, 2S1; bulUnum, 2S1 



Lemna, 178; miiwr, 192 



Lemnisci, 543 



Lepidoderma, 625; concinnum, 626, rhojn^ 

 boides, 625, squamatum, 625 



Lepidoptera (moths), 903, 917; see Insecta 



Lepidurus, 671; bilobatus, 671, couesii, 671, 

 glacialis, 671, lemmoni, 671 



Lepocinclis, 253 



Lepodermatidae, 402 



Lepomis megalotis, 1031 



Leptidae (larvae), 946 



