1094 



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 

 Drepanido taenia, 442; fasciata, 451, lanceo- 



lata, 442 

 Drepanothrix, 710; dentaia, 710 

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

 Dromus, 1012; dromus, 1012 

 Dnmella (imago), 920, (nymph), 922 

 Dryops (adult), 942 

 Dunhevedia, 725; crassa, 725, serrata, 726, 



setigera, 725 

 Dwarf plankton, 6; see Plankton 

 Dysnomia, 1009 



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

 Dytiscus (adult), 908, 941 



Earthworms (Chaetopoda), aquatic; see 



Chaetopoda and OUgochaeta 

 Echinochasminae, 391 

 Echinocotyle, 442; rosseieri, 442 

 Echinodermata, 15 

 Echinopharyphium, 391 

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



thecalus, 548 

 Echinostoma, 391; spinulosum, 391 

 Echinostome cercariae, 420 

 Echinostomidae, 390 

 Edipidrilus, 643; asymmetricuSf 64$, frigidus, 



643, palustris, 643 

 Ectoprocta, 951 

 Eiseniella (Helodrilus), 643; tetraedus (Helo- 



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

 Elakatothrix, 152; viridis, 152 

 Elliptio, 1000 

 Elmis (adult), 942 

 Elodea, 191, 192 

 Elvirea, 248; cionae, 24S 

 Emea rubra, 457, 45S 

 En allagma (imago) , 923, (nymph) , 928; 



antennatum (nymph), 928 

 Enchelys, 273; pupa, 273 

 Enchytraeidae, 642 

 Enchytraeus, 642 

 Encyonema, 129; auerwaldii, 129 

 Endoprocta, 951 

 Endosphaera, 157; biennis, 157 

 Enteromorpha, 161; intesHndlisy 161 

 Entocy there, 8o5; cambaria, 806 

 Entosiphon, 257; sidcatus, 257 

 Eosphora, 591; digitata, 591 

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

 Ephemcrella (imago), 920, (nymph), 922 

 Ephemerida (mayflies) , aquatic, 885-888, 



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



nymphs, 921-922; see Insecta 



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

 evereiti, 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; utricidus, 263 



Epischura, 755; lacustris, 756, nevadensis, 756 



Epision, 449 



Epistome, 948 



Epistylis, 295; fiavicans, 295 



Epithemia, 134; iurgida, 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, Junduli, 

 784, labracis, 785, versicolor, 786 



Eschaneustyla, 288; brachytona, 288 



Estheria, 673; belfragel, 674, calijornica, 674, 

 compleximanus , 674, digueti, 674, mexicana, 

 675, morsel, 664, 675, newcombii, 674, setosa, 

 675 



Etkeostoma caeruleum, 1047 



Ethmolaimus, 491; atnericanus, 491 



Euastrum, 140; elegans, 140 



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

 gelidus, 669, holmani, 668, 670, ornatus, 669, 

 serratus, 670, vernalis, 668 



Euchlanidae, 56S, 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; alveolata, 231, brachiata, 231, 

 ciliata, 231, compressa, 231, cristata, 23c. 

 mucrotmta, 230 



Euglyphidae, 228 



Euichthydina, 624 



EulameUibranchia, 994 



Euhirmadia, 673; agassizii, 673, texana^ 673 



Eumermis, 505 



Eunotia, 134; pectincUis, 134 



Eupera, 1019; singleyi, 1019 



Euplotes, 291; charon, 291, patella, 291 



Euryalona, 720; occidentalis, 720 



Eurycaelon, 992; antkonyi, 992 



Eurycercinae, 716 



Eurycercus, 716; lamdlatus, 717 



Eurycypris, 814; pubera (Cypris), 814 



Eurynia, ion 



Eurytemora, 750; affinis, 756 



Eustrongylus papillosus, 523 



Euthyploda (imago), 918, (nymph), 921 



