HO4 



INDEX 



Physocypria, 819; inequivalva (Cypria), 822, 

 pustulosa (Cypria), 821 



Physomonas, 247; elongata, 247 



Phytia, 978 



Phytoflagellata, 259 



Phytomastigida, 249 



Phytomastigophora, 259 



Pierosoma, 983 



Pilea, 1009 



Pimephales nolatus, 1048 



Pinnularia, 127; viridis, 127 



Fiona, 873; constricla, 873, rufa, 873 



Pionacercus leuckarti, 853 



Pioninae, 870 



Pipette, piston, 82 



Piscicola punctata, 655 



Pisidium, 1019; virginicum, 1019 



Piston pipette, 82 



Pithophora, 166; kewensis, 166 



Placobdella, 652; hollensis, 654, montifera, 

 652, parasitica, 653, pediculata, 653, pha- 

 lera, 654, picla, 653, rugosa, 654; s. str., 653 



Placocephalus kewense, 360 



Placocista, 231; spinosa, 231 



Plagiola, 1013; elegans, 1014, securis, 1014; 

 s. s., 1014 



Plagioporus, 394; serotinus, 394 



Plagiopyxis, 225; cattida, 226, labiata, 226 



Plagiorchiidae, 402 



Plagiorchiinae, 403 



Plagiorchis, 404, proximus, 404 



Plagiostoma (?) planum, 361, 364 



Planaria, 355; agilis, 357, dorolocephala, 357, 

 foremanii, 355, fuliginosus, 359, gonoceph- 

 ala, 356, ligubris, 355, maculata, 356, wor- 

 gawi, 358, simplex, 358, simplissima, 355, 

 truncata, 358, itnionicola, 358, ae/a/a, 358 



Planarians; see Turbellaria 



Planariidae, 354 



Planktology, 6 



Plankton, 4, 6, character of organism, 7, 

 dwarf, 6, fish life and, 1082, limnoplank- 

 ton, 6, nannoplankton, 6, 7, quantitative 

 study, 81, by piston pipette, 82, quantity, 

 47, 48, Sedgewick-Rafter cell, 82, size, 7, 

 specimens shown in bolting cloth, 7; see 

 Nannoplankton 



Plankton pump, 70, 78; cylinders, 73, 

 quantitative plankton net, 74, quanti- 

 tative closable plankton net, 77 



Planktonema, 163, 164; lauterbornii, 164 



Planorbella, 983 



Planorbidae, 982 



Planorbinae, 982 



Planorbis, 982; antrosus, 982, campanulalus, 



983, crista, 984, cultratus, 983, glabratus, 

 982, hirsutus, 983, opercularis, 983, parvus, 



984, trivolvis, 983; s. s., 982 

 Planorbula, 984 



Plant societies, succession of, 197 



Plants, amphibious, 183; succession of so- 

 cieties, 197 



Plants, aquatic, 179, 180; distribution, 194, 

 factors in formation of marl and marl lakes, 

 207, floating, 178, groups, 197, growing in 

 soil, 202, 203, hibernacula (winter buds), 

 192, incrustation, mineral, 185, carbonate 

 of lime, 186, gelatinous, 187, leaves, 180, 

 submerged, 182, phanerogams, 198, refer- 

 ences, 209, reproduction, by runners, 189, 

 by pollination under water, 189, stomata on 

 submerged leaves, 184, submerged leaves, 

 182, succession of societies, 197, zones, 196; 

 see Vegetation, Larger (Higher) 



Plants, water; see Plants, aquatic 



Plathemis (imago), 927, (nymph), 932 



Platoum, 228; parvum, 228 



Platycola, 297; decumbens, 297 



Platycopa, 806 



Platydorina, 145, 268; caudala, 145, 268 



Platyhelminthes (Flatworms); see Cestoda; 

 Flat worms; Nemertina; Trematoda; Tur- 

 bellaria 



Platytrichotus, 288; opislhobolus, 288 



Plea, 934 



Plecoptera (stoneflies), 882-885, 9 J 7; nymphs, 

 883 ; see Insecta 



Plectanocotyle, 375 



Plectonema, in; wollei, in 



Plectus, 492; tubifer, 492 



Pleodorina, 146, 268; californica, 268, illi- 

 noisensis, 146, 268 



Pleorchis, 397; mollis, 397 



Plerocercoid, 427, 451 



Plethobasus, 1000 



Pleurobema, 999; aesophus, 1000, clava, 999 



Pleurocera, 993; canaliculatum, 993, plena, 

 993 



Pleuroceratidae, 991 



Pleurococcaceae, 152 



Pleurococcus, 152; vulgaris, 152 



Pleurogenetinae, 400 



Pleuromonas, 249; jaculans, 249 



Pleuronema, 281; chrysalis, 281 



Pleurosigma, 127; altenualum, 127 



Pleurotaeniopsis, 138; turgidus, 138 



Pleurotaenium, 138, 139; nodulosum, 139 



Pleurotricha, 289; lanceolata, 289 



Pleurotrocha, 589; grandis, 589 



Pleuroxalonella, 734 



Pleuroxus, 726; acutiroslris, 736, aduncus, 

 729, denliculalus, 728, gracilis, 727, hamu- 

 latus, 728, hastatus, 727, proeurvatus, 726, 

 slriatus, 725, 727, trigonellus, 729, Iruncatus, 

 727, uncinatus, 726, unidens, 727 



Ploesoma, 603; hudsoni, 603, lenticular e, 603, 

 truncatum, 603 



Ploesomidae, 570, 603 



Plumatella, 952; arethusa, 953, polymorpha. 

 953, princeps, 953, punctata, 954 



