I094 



INDEX 



Dracunculidae, 523 



Dragonflies (Odonata), aquatic; see Insecta 



and Odonata 

 Drainage of swamps, 1075 

 Draparnaldia, 169; plumosa, 169 

 Dredge, cone, 68, pyramid, 71, triangle, 71 

 Dreissensiidae, 1018 

 Drepanidotaenia, 442; fasciata, 451, lanceo- 



lata, 442 

 Drepanothrix, 710; dentata, 710 

 Dromogomphus (imago), 924, (nymph), 930 

 Dromus, 1012; dromus, 1012 

 Drunella (imago), 920, (nymph), 922 

 Dryops (adult), 942 

 Dunhevedia, 725; crassa, 725, serraia, 726, 



se tiger a, 725 

 Dwarf plankton, 6; see Plankton 

 Dysnomia, 1009 



Dytiscidae (adults), 940, (larvae), 943 

 Dytiscus (adult), 908, 941 



Earthworms (Chaetopoda), aquatic; see 



Chaetopoda and Oligochaeta 

 Echinochasminae, 391 

 Echinocotyle, 442; rosseteri, 442 

 Echinodermata, 15 

 Echinopharyphium, 391 

 Echinorhynchus, 547; gigas, 542, salvelini, 548, 



thecatus, 548 

 Echinostoma, 391; spinulosum, 391 

 Echinostome cercariae, 420 

 Echinostomidae, 390 

 Eclipidrilus, 643; asymmetricus, 64s, frigidus, 



643, palustris, 643 

 Ectoprocta, 951 

 Eiseniella (Helodrilus), 643; tetraedus (Helo- 



drilus), 643, forma pupa (Helodrilus), 643 

 Elakatothrix, 152; viridis, 152 

 Elliptio, icxx> 

 Elmis (adult), 942 

 Elodea, 191, 192 

 Elvirea, 248; cionae, 248 

 Emea rubra, 457, 458 

 Enallagma (imago), 923, (nymph), 928; 



antennatum (nymph), 928 

 Enchelys, 273; pupa, 273 

 Enchytraeidae, 642 

 Enchytraeus, 642 

 Encyonema, 129; auerwddii, 129 

 Endoprocta, 951 

 Endosphaera, 157; biennis, 157 

 Enteromorpha, 161; intestinalis, 161 

 Entocythere, 806; cambaria, 806 

 Entosiphon, 257; sidcatus, 257 

 Eosphora, 591; digitata, 591 

 Ephemera (imago), 918, (nymph), 921 

 Ephemerella (imago), 920, (nymph), 922 

 Ephemerida (mayflies), aquatic, 885-888, 



917,918-922; keys: 917; imagos, 918-921; 



nymphs, 921-922; see Insecta 



Ephydatia, 307, 309, 314; crateriformis, 311, 



everetti, 311, fluvaitilis, 309, japonica, 310, 



leidyi, 951, millsii, 309, miilleri, 309, 310. 



robusta, 310, subdivisa, 309, subtilis, 310 

 Epiaeschna (imago), 925, (nymph), 930 

 Epicordulia (imago), 926, (nymph), 931 

 Epilimnion, 28 

 Epiphragma fascipennis, 912 

 Epipyxis, 263; ulricidus, 263 

 Epischura, 755; lacustris, 756, nevadensis, 756 

 Epision, 449 

 Epistome, 948 



Epistylis, 295; flavicans, 295 

 Epithemia, 134; turgida, 134 

 Epithemiaceae, 133 

 Eremosphaera, 153; viridis, 153 

 Eretmia, 603; trithrix, 603 

 ErgasiUdae, 783-786; key, 784-876; see 



Copepoda and Siphonostomata 

 Ergasilus, 783; caeruleus, 785, centrarchida- 



rum, 785, chautauquaensis, 786, funduli, 



784, labracis, 785, versicolor, 786 

 Eschaneustyla, 288; brachyiona, 288 

 Estheria, 673; belfragei, 674, calif ornica, 674, 



compleximanus, 674, digueti, 674, mexicana, 



675, morsei, 664, 675, newcombii, 674, selosa, 



675 

 Etheostoma caeruleum, 1047 

 Ethmolaimus, 491; americanus, 491 

 Euastrum, 140; elegans, 140 

 Eubranchipus, 668; bundyi, 670, dadayi, 669, 



gelidus, 669, holmani, 668, 670, ornatiis, 669, 



serratus, 670, vernalis, 668 

 Euchlanidae, 568, 593 

 Euchlanis, 595; macrura, 595 

 Eucrangonyx, 843 



Eudorina, 146, 267; elegans, 146, 267 

 Euglena, 251; spirogyra, 251, viridis, 251 

 Euglenida, 251 

 Euglenidae, 251 

 Euglypha, 230; alveolaia, 231, brachiata, 231, 



ciliata, 231, compressa, 231, cristata, 230, 



mucronata, 230 

 Euglyphidae, 228 

 Euichthydina, 624 

 Eulamelhbranchia, 994 



Eulimnadia, 673; agassizii, 673, texana, 673 

 Eumermis, 505 

 Eunotia, 134; pectinalis, 134 

 Eupera, 1019; singleyi, 1019 

 Euplotes, 291; charon, 291, patella, 291 

 Euryalona, 720; occidentalis, 720 

 Eurycaelon, 992; anthonyi, 992 

 Eurycercinae, 716 

 Eurycercus, 716; lamellatus, 717 

 Eurycypris, 814; pubera (Cypris), 814 

 Eurynia, ion 



Eurytemora, 750; affinis, 756 

 Eustrongylus papillosus, 523 

 Euthyplocia (imago), 918, (nymph), 921 



