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; hyaliniis, 228, mutabilis, 228 



Pandorina, 145, 267; niorum, 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; kellicotii, 390, westcr- 

 manli, 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; liloralis, 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 Roundworms, 506-552; differen- 

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

 5ee 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 Roundworms; Trema- 

 toda 



Parmulina, 221; cyalhus, 221 



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



Parophryoxus, 708; tubulatus, 708 



Pectinatella, 954; magnifica, 948, 954 



Pectinibranchiata, 986 



Pedalion, 613; niirum, 613 



Pedalionidae, 613 



Pedetes, 613; sallator, 613 



Pediastrum, 160; boryanum, 160 



Pedipes, 978; unisidcatus, 97S 



Pedinocoris, 933 



Pegias, 1003; fabula, 1003; 



Pegosomum, 391 



Pelagic region, 4 



Peleciius helicinus, 524 



Pelogonidae, 933 



Pelomyxa, 219; caroliiunsis, 219, paiustris, 



219 

 Pelonomus (adult), 942 

 IV'lurempis (larva), 944 

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

 I'cnium, 138; cucurbitinum, 138 

 I'entagcnia (imago), 918, (nymph), 921 

 I'cranema, 255; irichophonim, 255 

 Peranemidac, 255 

 i'eridinium, 270; tabtilatum, 270 

 I'erispira, 273; strephosoma, 273 

 I'erithcmis (imago), 926, (nymjih), 931 

 Peritricha, 291 

 Perla, 883 



Petalomonas, 256; plcurosigma, 25t'i 

 Phacus, 253; longicaudus, 253, plmronectes, 



253 

 Phaenocora, 348; agassizi, 348 

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



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

 Phagocata, 359; gracilis, 359 

 Phalansterium, 25S; digitatum, 258 

 Phanerogams, aquatic, 198 

 Phascolodon, 277 

 Phialonema cyclostomum, 256 

 Philhydrus (adult), 940 



Philobdella, 657; fioridana, 657, gracile, 657 

 Philodina, 619; brycci, sn, 619, roseola, 619 

 Philodinidae, 619 

 Philopotamidae, 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 {Ilaploiaxis emissarius), 642 

 Phryganea, 902 

 I'hryganeidae, 936, 937 

 I'hryganella, 227; hcmisphacrica, 228, nidtdus, 



22^ 



Phycochromophyceae; see .\lgae, Blue-Gn-en 



Phycoerythrin, 117 



Phycophacin, 117 



Phylactolaemata, 952 



Phyllodistomum, 399; dmcriidnum, 399, fo- 

 lium, 414, 421 



Phyllomitus, 248; amylophagtis, 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: afisari, 172 



Physa, 985; i?,vri;ia. 985 



Physaloptera, 526; constricta, 526, conUirta, 

 526 



Physidae. 984 



Physiography, 22 



