iio8 



INDEX 



Siphlurus (imago), 920, (nymph), 922 



Siphonales, 172 



Siphonaria, 979; allernala, 979, peltoides, 980; 



s. s., 979 

 Siphonariidae, 979 

 Siphonostomata (Parasitic Copepoda), 782- 



788; structure, 783; see Argulidae; Cope- 

 poda; Ergasilidae 

 Sisyra (adult), 934, (larva), 899, 93s 

 Slavina, 639; appendiculala, 639 

 Solenophrya, 299; Pera, 299 

 Soraatochlora (imago), 926, (nymph), 931 

 Somatogyrus, 991; subglobosus, 991 

 Sorastrum, 159; spinulosum, 159 

 Sow-bugs, 828; see Malacostraca 

 Sparganophilus, 643; benhami, 643, eiseni, 



643, smithi, 643 

 Sparganum, 434; mansoni, 433, 434, pro- 



liferum, 434, sebago, 434 

 Spathidium, 273; spaihula, 273 

 Sperchon, 870; glandulosus , 870 

 Sperchoninae, 869 



Sphaerella, 144; nivalis, 144, pluvialis, 144 

 Sphaeriidae, 1018 

 Sphaerium, 1018; simile, 1018 

 Sphaerocystis, 151; schraeteri, 151 

 Sphaerophrya, 299; magna, 299 

 Sphaeroplea, 165; annulijia, 165 

 Sphaeropleaceae, 165 

 Sphaerostoma, 408 

 Sphaerozosm^a, 136; pulchrutn var. injlatum, 



136, vertebralum, 136 

 Sphenoderia, 229; deniata, 229, lenta, 230, 



macrolepis, 230 

 Sphenomonas, 254; quadrangularis , 254 

 Sphyranura, 378; osleri, 378 

 Spicula, 475 



Spilophora, 489; canadensis, 489 

 Spinitectus, 527; gracilis, 527 

 Spirocypris, 813; passaica, 813, tuberculata, 



814 

 Spirogyra, 142; crassa, 142 

 Spiromonas, 249; angusla, 249 

 Spironoura, 533; afine, 533, gracile, 533 

 Spirostomum, 284; ambiguum, 184 

 Spirotaenia, 137; minuta, 137 

 Spirulina, 107; major, 107 

 Spiruridae, 525 

 Spirurinae, 525 

 Spiruroidea, 525 

 Spondylomorum, 144, 267; quarternarium, 



144, 267 

 Spondylosium, 136; papiUatunt, 136 

 Sponges; see Porifera 

 Spongilla, 306, 311; aspinosa, 306, baileyi, 311, 



fragUis, 307, igloviformis, 307, lacustris, 



306, novae-ierrae, 307, paupercida, 306, 



wagneri, 308 

 Spongilla-flies, 897; see Hemerobiidae; In- 



secta; Neuroptera 



SpongomonaS, 262; discus, 262 



Sporadoporus, 862; invalvaris, 862 



Spores of bacteria, 92; see Bacteria 



Sporocyst, 371 



Sporozoa, 14 



Stagnicola, 981 



Stations, fresh- water biology, 12 



Statoblast, 949 



Staurastrum, 139; crenulatum, 139 



Staurogenia, 160 



Stauroneis, 128; anceps, 128 



Stauroptera, 127 



Stenelmis (adult), 942 



Stenostomum, 334; agile, 336, coluber, 337, 

 grande, 336, leucops, 335* speciosum, 335, 

 ienuicauda, 336 



Stentor, 285; coeruleus, 285, polymorpkus, 285 



Stephanoceros, 611; eichhornii, 611 



Stephanodiscus, 127; niagareoe, 127 



Stephanoprora, 391; gilberii, 391 



Stephanops, 597; intermedins, 597 



Stephanosphaera, 145, 266; pluvialis, 14S, 

 266 



Stichococcus, 152; bacillaris, 152 



Stichorchis, 386, sublriqueirus, 386 



Stichostemma asensoriatum, 457, rubrum, 455, 

 4S8 



Stichotricha, 287; secunda, 287 



Stigonema, 112; minutum, 112, ocellaium, 112 



Stigonemaceae, 112 



Stomata on submerged leaves, 184 



Stoneflies; ^ee Insecta; Plecoptera 



Stratification of aquatic organisms, 10 



Stratiomyiidae (larvae), 946 



Streams; bottom materials, 24, bottoms, 

 differentiation in, 25, current strength, 23, 

 evolution, 5, hydrogen sulphide, 39, rate 

 of flow, 27, self-purification, 1078, tem- 

 perature of water, 32 



Streblocerus, 709; pygmaeus, 709, serricau- 

 datus, 709 



Strephobasis, 993 



StreptocephaUdae, 670 



Streptocephalus, 670; Jloridanus, 670, sealU, 

 670, texanus, 670 



Strigea, 410; cornu, 410 



Strobila, 424 



Strombidium, 286; claparedii, 286 



Strongyleae, 522 



Strongylidae, 522 



StrongyHnae, 522 



Strongyloidea, 522 



Strongyloides stercoralis, 521 



Strongylostoma, 350; gonocepkaluntt 350, 

 radiaium, 350 



Strongylus, 522; auricularis, 523 



Strophitus, looi; edentulus, looi 



Stygonectes, 843 



Stylaria, 639; fossularis, 639, lacustris, 635, 

 639 



