INDEX 



IIO5 



Pneumatophilus, 406; variabilis, 406 

 Pneumobites, 403; breviplexus, 403, longi- 



plexus, 403 



Pneumonoeces, 403; coloradensis, 403 

 Podocopa, 806 

 Podophrya, 298; fixa, 298 

 Pollination under water, 189 

 Pollution, prevention of, 1075 

 Polyadenous cercariae, 416 

 Polyartemiella, 666; hanseni, 666,judayi, 667 

 Polyartemiidae, 666 

 Polyarthra, 591; platyptera, 591 

 Polycelis, 359; coronala, 359 

 Polycentropidae, 937 

 Polychaeta, 632 

 Polychaetus, 599; collinsii, 599 

 Polycotyle, 410; ornala, 410 

 Polycystididae, 353 



Polycystis, 353; gaetti, 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; integer rimum, 376 

 Polystomidae, 375 

 Polystomoides, 376; coronatum, 376, hassalli, 



376, megacotyle, 377, microcolyle, 377, 



opacum, 378, oblongum, 377, orbiculare, 377 

 Polytoma, 265; uvella, 265 

 Polyzoa; see Bryozoa 

 Pomatiopsinae, 991 

 Pomatiopsis, 991; lapidaria, 991 

 Pompholiginae, 984 

 Pompholyx, 611, 984; complanta, 611, ejfusa, 



984 



Pompholyxophrys, 235; punicea, 235 



Pomphorhynchus, 551 



Ponds, 2; age series, 49 



Pontigulasia, 225; spectabilis, 225 



Pontoporeia, 842; hoyi, 842 



Pools, 3 



Porifera (sponges), Fresh- Water, 15, 301-315; 

 collecting, 304, development, 303, habits, 

 302, key, 306315, methods of study, 305, 

 references, 315, structure, 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, heterophyttus, 183, 195, lucens, 193, 

 natans, 182, pectinalus, 182, 185, 191, 

 perfoliatus, 181, 191, 192, robbinsii, 191 



Potamogetonetum, 196 



Potamopyrgus, 990; coronatus, 990 



Pottsiella erecta, 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; flagellum, 640, longiseta, var. 

 leidyi, 640 



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

 werneckii, 555, 589 



Problems, Technical and Sanitary, 1067- 

 1083; algae, methods of killing, io?6, pre- 

 vention of growths of, 1074, purification of 

 water containing, 1077; bacteria, in water, 

 1070, bacillus coli 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, 1071 



Probopyrus, 842; pandalicola, 842 



Proboscis, 542; sheath, 543 



Proglottids, 424 



Progomphus (imago), 924, (nymph), 929 



Proptera, 1016; (data, 1016 



Prorhynchidae, 339 



Prorhynchus, 339; applanatus, 340, stagnates, 



339 



Prorodon, 274; ovum, 274 

 Prosthogoniminae, 402 

 Prosthogonimus, 402 

 Prostoma marginalum, 363 

 Prostomatous cercariae, 412 

 Prosostomata, 379 



Protenes, 394; leptus, 394, angustus, 394 

 Protenteron, 401; diaphanum, 401 

 Proteocephalidae, 434 

 Proteocephalus, 434; ambloplitis, 436, exiguus, 



437, macrocephalus, 435, perplexus, 435, 



pinguis, 437, pusittus, 437, singularis, 435 

 Proteomyxa, 233 



Proterospongia, 258; haeckeli, 258 

 Protodepsis occidentals, 654 

 Protococcaceae, 156 

 Protococcales, 143 

 Protosiphon, 156; botryoides, 156 

 Protozoa, 14, 210-300; see Infusoria; Masti- 



gophora; Sarcodina 

 Psamathiomyia (larva), 945 

 Psephenus (adult), 942 

 Pseudalona, 718 



Pseudodifflugia, 229; gracUis, 229 

 Pseudoecistes, 617; rotifer, 617 



