INDEX 



1103 



Palmella, 150 



Palmella condition, 115 



Palmellaceae, 147 



Palmellococcus, 153 



Palmodactylon, 148 



Palmodictyon, 149; viridis, 149 



Paludestrina, 989; nickliniana, 989 



Paludicella ehrenbergii, 952 



Paludicola, 354 



Pamphagus, 228; hyalinus, 228, mutabilis, 228 



Pandorina, 145, 267; morum, 145, 267 



Panisus, 862, cataphraclus, 862 



Pantala (imago), 927, (nymph), 932 



Paracandona, 823; euplectella, 823 



Paracypris, 817; grandis (Cypris), 819, perele- 

 gans (Cypris), 819 



Paragonimus, 390; ketticotii, 390, wester- 

 manii, 390 



Paragordius, 539; varius, 539. embryo of, 536 



Paralonella, 734 



Paramermis, 505 



Paramoecium, 281; caudatum, 281 



Paramphistoma cervis, 413 



Paramphistomidae, 385 



Paramphistominae, 385 



Paranais, 639; litoralis, 639 



Paraponyx, 903 



Paraptera, 1017; gracilis, 1017 



Parasitic Copepoda, 782-788; see Argulidae; 

 Copepoda; Ergasilidae; Siphonostomata 



Parasitic Flatworms, 365-453; adaptability, 

 366, external, 367, methods of study, 368, 

 number, 365, period of free existence, 366; 

 see Cestoda; Parasitic Worms; Trematoda 



Parasitic Round worms, 506-552; differen- 

 tiator, 508, references, 551, technic, 507; 

 see Acanthocephala; Gordiacea; Nematoda, 

 Parasitic; Parasitic Worms 



Parasitic Worms, 365-369, 452; adaptations, 

 365, external, 367, methods of study, 368, 

 period of free existence, 366, references, 

 452; see Acanthocephala; Cestoda; Gordi- 

 acea; Nematoda, Parasitic; Parasitic Flat- 

 worms; Parasitic Round worms; Trema- 

 toda 



Parmulina, 221; cyalhus, 221 



Parnidae (adults). 942, (larvae), 943 



Parophryoxus, 708; tubiUatus, 708 



Pectinatella, 954; magnified, 948, 954 



Pectinibranchiata, 986 



Pedalion, 613; mirum, 613 



Pedalionidae, 613 



Pedetes, 613; solicitor, 613 



Pediastrum, 160; boryanum, 160 



Pedipes, 978; unisulcatus, 978 



Pedinocoris, 933 



Pegias, 1003; fabula, 1003; 



Pegosomum, 391 



Pelagic region, 4 



Pelecilus helicinus, 524 



Pelogonidae, 933 



Pelomyxa, 219; carolinensis, 219, palustris, 

 219 



Pelonomus (adult), 942 



Pelorempis (larva), 944 



Peltodytes (adult), 938, (larva), 943 



Penium, 138; cucurbitinum, 138 



Pentagenia (imago), 918, (nymph), 921 



Peranema, 255; trichophorum, 255 



Peranemidae, 255 



Peridinium, 270; tabulatum, 270 



Perispira, 273; slrephosoma, 273 



Perithemis (imago), 926, (nymph), 931 



Peritricha, 291 



Perla, 883 



Petalomonas, 256; pleurosigma, 256 



Phacus, 253; longicaiidus, 253, pleuronectes, 

 253 



Phaenocora, 348; agassizi, 348 



Phaeophyceae, 174-175; key, 174-175; see 

 Algae, Fresh-Water, excl. of Blue-Green 



Phagocata, 359; gracilis, 359 ' 



Phalansterium, 258; digitatum, 258 



Phanerogams, aquatic, 198 



Phascolodon, 277 



Phialonema cyclostomum, 256 



Philhydrus (adult), 940 



Philobdella, 657; floridana, 657, gracile, 657 



Philodina, 619; brycei, 577, 619, roseola, 619 



Philodinidae, 619 



Philopotamidae, 936 



Phormidium, 108; subfuscunt, 108 



Photographing, Methods of, 86-88; see 

 Methods of Photographing 



Photography, under- water, 86; see Methods 

 of Photographing 



Photokinesis, 328 



Phragmitetum, 196 



Phreoryctes (Haplotaxis emissarius), 642 



Phryganea, 902 



Phryganeidae, 936, 937 



Phryganella, 227; hemisphaerica, 22&,niddus, 

 227 



Phycochromophyceae; see Algae, Blue-Green 



Phycoerythrin, 117 



Phycophaem, 117 



Phylactolaemata, 952 



Phyllodistomum, 399; americanum, 399, fo- 

 lium, 414, 421 



Phyllomitus, 248; amylophagus, 248 



Phyllopoda (fairy shrimps), 661^675; col- 

 lecting, 666, development, 664, key, 666- 

 675, occurrence, 661, 665, references, 675, 

 structure, 662; see Crustacea 



Phyllosiphon, 172; arisari, 172 



Physa, 985; gyrina, 985 



Physaloptera, 526; constrlcta, 526, contorta, 

 526 



Physidae, 984 



Physiography, 22 



