INDEX 



IOQ7 



Herpobdellidae, 659 



Herposteiron, 169; confervicola, 169 



Hetaerina (imago), 923, (nymph), 928 



Heterakidae, 532 



Hetet -anther -a graminea, 191 



Heterocheilidae, 533 



Heterocysts, 103 



Heteromastigida, 248 



Heteromastigidae, 246 



Heteromeyenia, 312, 314; argyrosperma, 313, 

 re pens, 313, ryderi, 312 



Heteromita, 249; ovata, 249 



Heteronema, 256; acus, 256 



Heterophrys, 235; myriopoda, 235 



Heterostomum echinatum, 411 



Heterotricha, 283 



Hexagenia (imago), 918, (nymph), 921; bi- 

 lineata, 887 



Hexamita, 250; inflata, 250 



Hexotricha, 277; globosa, 277 



Hibernacula, 192, 949 



Hippuetis, 983 



Hirmidium, 259; inane, 259 



Hirudinea (leeches), Fresh- water, 16, 646-660; 

 key, 651-660, methods of study, 651, ne- 

 phridia, 648, occurrence, 649, references, 

 660, reproduction, 647, 650 



Hirudinidae, 656 



Hirudo medicinalis, 657 



Histrio, 290; erethislicus, 290 



Histriobalantidium, 281 



Holopedidae, 693 



Holopedium, 693; amazonicum, 693, gib- 

 berum, 693 



Holophrya, 272 



Holosticha, 288; vernalis, 288 



Holostomata, 409 



Holostome cercariae, 423 



Holostomum, 410; nitidum, 410 



Holotricha, 271 



Hormidium, 162; nitenz, 172 



Hormospora, 163; mutabUis, 163 



Homostyla, 287; elliptica, 287 



Hormogoneae, 107 



Hormotila, 148; mucigena, 148 



Host, intermediate, 371, primary, 372, second- 

 ary, 372 



Hyalella knickerbockeri, 843 



Hyalodiscus, 219; rubicundus, 219 



Hyalolampe fenestrata, 235 



Hyalosphenia, 223; cuneata, 223, elegans, 223, 

 papilio, 223 



Hyalotheca, 135; dissttiens, 135 



Hydaticus (adult), 941 



Hydatina, 599; senta, 599 



Hydatinidae, 569, 599 



Hydatinina, 599 



Hydra, 316-322; development, 317, habitat, 

 318, key, 320-322, methods, 319, structure, 

 316; corala, 321, fusca, 321, grisea, 320, 



oligactis, 320, 321, pallida, 321, polypus, 321, 



viridis, 320, viridissima, 320, vulgaris, 320; 



see Hydrozoa 

 Hydracarina (water-mites), Fresh-water, 17, 



851-875; development, 855, key, 859-874, 



methods of study, 857, occurrence, 851, 



references, 875, structure, 852 

 Hydrachna, 860; geographica, 860 

 Hydrachnidae, 860 

 Hydraena, 938 

 Hydrobaenus (larva), 945 

 Hydrobius (adult), 940 

 Hydrocampa, 903 

 Hydrocharis (adult), 940 

 Hydrochus (adult), 939 

 Hydrocirius, 933 



Hydrocoleum, 109; homoeotrichum, 109 

 Hydrodictyaceae, 160 

 Hydrodictyon, 160; reticulatum, 160 

 Hydrogen sulphide in streams, 39 

 Hydrography, i ; see Limnology, Oceanology, 



Rheology 

 Hydromermis, 505 

 Hydrometridae, 933 

 Hydrophilidae (adult), 938, (larva), 943 

 Hydrophilus, 940 

 Hydroporus (larva), 941, (larva and pupa), 



908 



Hy dropsy chidae, 937 

 Hydroptilidae, 936 

 Hydrosphere, i 

 Hydro vatus (adult), 941 

 Hydrozoa, Fresh- water, 316322; key, 320- 



322, medusae, 318, references, 322; see 



Hydra 



Hydryphantes, 862; ruber,S62 

 Hydryphantidae, 860 

 Hydryphantinae, 86 1 

 Hygrobates, 874; longipalpis, 874 

 Hygrobatidae, 863 

 Hygrobatinae, 873 

 Hymenoleptdidae, 441 

 Hymenolepis, 442; compress a, 442,fusus, 442, 



megalops, 442 

 Hymenostoma, 281 

 Hypolimnion, 28, 38 

 Hypotricha, 286 

 Hysterophora, 333, 361 

 Hysterothylacium, 534; brachyurum, 534 

 Hystrichis papillosus, 523 



Ichthydiidae, 624 



Ichthydium, 624; podura, 624, sulcatum, 



625 



Ichthyobdellidae, 655 

 Ichthyonema, 523; cylindraceum, 524 

 Idiogenes, 441 

 Ileonema, 271; dispar, 271 

 Ilybiosoma (adult), 941 

 Ilybius (adult), 941 



