INDEX 



1 103 



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, 14s, 267; morum, 145, 267 



Panisus, 862, cataphracius, 862 



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



Paracandona, 823; euplectella, 823 



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

 gans (Cypris), 819 



Paragonimus, 390; kellicotti, 390, wester- 

 manU, 390 



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



Paralonella, 734 



Paramermis, 505 



Paramoecium, 281; caudatum, 281 



Paramphisloma cervis, 413 



Paramphistomidae, 3S5 



ParampUstominae, 385 



Paranais, 639; lUoralis, 639 



Paraponyx, 903 



Paraptera, 1017; gracilis, 1017 



Parasitic Copepoda, 782-788; see Argulidae; 

 Copepoda; Ergasilidae; Siplionostomata 



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 Roundworms, 506-552; differen- 

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

 see Acanthocephala; Gordiacea; Nematoda, 

 Parasitic; Parasitic Worms 



Parasitic Worms, 365-369, 452; adaptations, 

 36s, external, 367, methods of study, 368, 

 period of free existence, 366, references, 

 452; «e Acanthocephala; Cestoda; Gordi- 

 acea; Nematoda, Parasitic; Parasitic Flat- 

 worms; Parasitic Roundworms; Trema- 

 toda 



Parmuhna, 22r; cyathus, 221 



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



Parophryoxus, 708; tubulatus, 708 



Pectinatella, 954; magnifica, 948, 954 



Pectinibranchiata, 986 



Pedalion, 613; mirum, 613 



Pedalionidae, 6r3 



Pedetes, 613; saltator, 613 



Pediastrum, 160; boryanum, 160 



Pedipes, 978; unisulcatus, 97S 



Pedinocoris, 933 



Pegias, 1003; fabula, 1003; 



Pegosomum, 391 



Pelagic region, 4 



Peiecilus helicinus, 524 



Pelogonidae, 933 



Pelomyxa, 219; carolincnsis, 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; strephosoma, 273 

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

 Peritricha, 291 

 Perla, 883 



Petalomonas, 256; pleurosigma, 256 

 Phacus, 253; longicaudus, 253, pleuronecles, 



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, 19S 

 Phascolodon, 277 

 Fhialonema cyclostomum, 256 

 Philhydrus (adult), 940 

 Philobdella, 657; floridana, 657, gracile, 657 

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

 Philodinidae, 6r9 

 Philopotaraidae, 936 

 Phormidium, 108; subfuscum, 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; hcmisphacrica, 228, nidulus, 



227 

 Phycochromophyceae; see Algae, Blue-Green 

 Phycoerythrin, 117 

 Phycophaein, 117 

 Phylactolaemata, 952 

 Phyllodistomum, 399; americanum, 399, fo' 



Hum, 414, 421 

 Phyllomitus, 248; amylophagus, 248 

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

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



67s, occurrence, 661, 665, references, 675, 



structure, 662; see Crustacea 

 Phyllosiphon, 172; arisari, 172 

 Physa, 985 ; gyrina, 985 

 Physaloptera, 526; conslricia, 526, contorta, 



526 

 Physidae, 984 

 Physiography, 22 



