INDEX 



IIOS 



Pneumatophilus, 406; variabilis, 406 



Pnemnobites, 403; brevipkxus, 403, longi- 

 plexiis, 403 



Pneumonoeces, 403; coloradensis, 403 



Podocopa, 8o5 



Podophrya, 298; fixa, 298 



Pollination under water, 189 



Pollution, prevention of, 1075 



Polyadenous cercariae, 416 



Polyartemiella, 656; hanseni, 666, jiidayi, 667 



Polyartemiidae, 666 



Polyarthra, S9i; platypiera, 591 



Polycelis, 359; coronala, 359 



Polycentropidae, 937 



Polychaeta, 632 



Polychaetus, 599; collinsii, 599 



Polycotyle, 410; ornata, 410 



Polycystididae, 353 



Polycystis, 353; gaeiti, 353, roosevelli, 353 



Polymitarcys (imago), 918, (nymph), 921; 

 alba, 888 



Polymorphus, 548; minutus, 548 



Polyopisthocotylea, 375 



Polyphemidae, 738 



Polyphemus, 738; pediculus, 738 



Polyrhytis, 981 



Polystoma, 376; integerrimum, 376 



Polystomidae, 375 



Polystomoides, 376; coronatum, 376, hassalli, 

 376, megacotyle, 377, microcotyle, 377, 

 opacum, 378, oUongum, 377, orbiculare, 377 



Polytoma, 265; uvella, 265 



Polyzoa; see Bryozoa 



Pomatiopsinae, 991 



Pomatiopsis, 991; lapidaria, 991 



Pompholiginae, 984 



Pompholyx, 611, 984; complanta, 611, ejffusa, 

 984 



Pompholyxophrys, 235; punicea, 235 



Pomphorhynchus, 551 



Ponds, 2; age series, 49 



Pontigulasia, 225; spcctahilis, 225 



Pontoporeia, 842; hoyi, 842 



Pools, 3 



Porifera (sponges), Fresh-Water, is, 301-31S; 

 collecting, 304, development, 303, habits, 

 302, key, 306-315, methods of study, 305, 

 references, 315, structtire, 301 



Porphyridium, 106 



Potamanthus (imago), 919, (nymph), 921 



Potamobiidae, 846 



Potamobius, 846; astacus, 846, gambeli, 846, 

 trowbridgei, 846 



Potamocypris, 808; smaragdina, 808 



Potamogeton, 181; crispus, 189, 192, densus, 

 185, heterophyllus, 183, 195, hicens, 193, 

 nalans, 182, pectinatus, 182, 185, 191, 

 perfoliatus, 181, 191, 192, robbinsii, 191 



Potamogetonetum, 196 



Potamopyrgus, 990; coronatus, 990 



PoUsiella erecia, 951 



Prasiola, 161; crispa, 161 



Prawns, 828; see Malacostraca 



Pressodon, 1006 



Pressure in water, 34; effect upon organisms, 



34 



Primary host; see Host, primary 



Prismatolaimus, 499; stenurus, 499 



Pristina, 640; fiageltum, 640, longiseta, var. 

 leidyi, 640 



Proales, 589; sordida, 589, tigrida, 589, 

 werneckii, 555, 589 



Problems, Technical and Sanitary, 1067- 

 1083; algae, methods of killing, 1076, pre- 

 vention of growths of, 1074, purification of 

 water containing, 1077; bacteria, in water, 

 1070, bacillus coU as index of contami- 

 nation, 1069; disease, transmission of, 1067, 

 water as conveyor of germs, 1068; drainage 

 of swamps, 1075; odors, cause of, 1073, 

 observation of, 1072; organisms in pipes 

 of water systems, 1081; plankton and fish 

 life, 1082; prevention of pollution, 1075: 

 soil stripping of reservoir sites, 1074; 

 streams and self-purification, 1078; water, 

 identification of source of, 1080, tastes and 

 odors in, 107 1 



Probopyrus, 842; pandaiicola, 842 



Proboscis, 542; sheath, 543 



Proglottids, 424 



Progomphus (imago), 924, (nymph), 92Q 



Proptera, 1016; alata, 1016 



Prorhynchidae, 339 



Prorhynchus, 339; applanatus, 340, stagnalis. 



339 

 Prorodon, 274; ovum, 274 

 ProEthogoniminae, 402 

 Prosthogonimus, 402 

 Prosioma marginatum, 363 

 Prostomatous cercariae, 412 

 Prosostomata, 379 



Protenes, 394; leplus, 394, angusius, 394 

 Protenteron, 401; diaphanum, 401 

 Proteocephahdae, 434 

 Proteocephalus, 434; amblopliiis, 436, exiguus, 



437, macrocephalus, 435, perplexus, 435, 



pinguis, 437, pusillus, 437, singularis, 435 

 Proteomyxa, 233 



Proterospongia, 258; haeckeli, 258 

 Protoclepsis occidentalis, 654 

 Protococcaceae, 156 

 Protococcales, 143 

 Protosiphon, 156; botryoides, 156 

 Protozoa, 14, 210-300; see Infusoria; Ma«ti- 



gophora; Sarcodina 

 Psamathiomyia (larva), 945 

 Psephenus (adult), 942 

 Pseudalona, 718 



Pseudodifflugia, 229; gracilis, 229 

 Pseudoecistes, 617; rotifer, 617 



