INDEX 



no: 



Pncumatophilus, 406; lariabilis, 40G 

 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; hanscni, 66(->,judayi, 667 

 Polyartemiidae, 666 

 Polyarthra, 591; platypicra, 591 

 Polycelis, 359; coronata, 359 

 Polycentropidae, 937 

 Polychaeta, 632 

 Polychaetus, 599; collinsii, 599 

 Polycotyle, 410; ornala, 410 

 Polycystididae, 353 



Polycystis, 353; gaelti, 353, rooscvcili, 353 

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



alba, 888 

 Polymorphus, 548; minutus, 548 

 Polyopisthocotylea, 375 

 Polyphemidae, 738 

 Polyphemus, 738; pediculus, 738 

 Polyrhytis, 981 



Polystoma, 376; inlcgerrimum, 376 

 Polystomidae, 375 



Polystomoides, 376; coronatum, 376, hassalli, 

 376, megacotyle, 377, microcolyle, 377, 

 opaciim, 378, oblongum, 377, orbicidare, 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; spcctabilis, 225 

 Pontoporeia, 842; hoyi, 842 

 Pools, 3 



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

 collecting, 304, development, 303, habits, 

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

 references, 315, structure, 301 

 Porphyridium, 106 



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

 Potamobiidae, 846 

 Potamobius, 846; aslacus, 846, gambcli, 846, 



troivbridgci, 846 

 Potamocypris, 808; smaragdina, 808 

 Potamogeton, 181; crispus, 189, 192, dcnsus, 

 185, heterophyllus, 183, 195, lucens, 193, 

 nutans, 182, pcctinatus, 182, 185, 191. 

 perfoliatus, 181, 191, 192, robbinsii, 191 

 Potamogetonetum, 196 

 Potamopyrgus, 990; coronalus, 990 



Pottsiella creda, 951 



Prasiola, 161; crispa, 161 



Prawns, 828; see Malacostraca 



Pressodon, 1006 



Pressure in water, 34; cflecl ujxin organisms, 

 34 



Primary host; sec Host, primar>' 



I'rismatulaimus, 499; stenurus, 499 



I'rislina, 640; Jlagellum, 640, iongiseta, var. 

 leidyi, 640 



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

 werncckii, ^55, 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 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, 107s: 

 soil stripping of reservoir sites, 1074; 

 streams and self-purification, 107.S; water, 

 identification of source of, 1080, tastes and 

 odors in, 107 1 



Probopyrus, 842; pandalicola, 842 



Proboscis, 542; sheath, 543 



Proglottids, 424 



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



Proptera, 1016; alata, 1016 



Prorhynchidae, 339 



Prorhynchus, 339; applanatits, 340, stagnalis, 



339 

 Prorodon, 274; ovum, 274 

 Prosthogoniminae, 402 

 Prosthogonimus, 402 

 Prostoma marginatum, 363 

 Prostomatous cercariae, 412 

 Prosostomata, 379 



Protenes, 394; leptus, 394, angustus, 394 

 Protenteron, 401; diaphanum, 401 

 Proteocephalidae, 434 

 Proteocephalus, 434; ambloplitis, 436. exiguus, 



437, macrocephaJus, 435, pcrplexus, 435, 



pinguis, 437. Pusillus, 437. singularis, 435 

 Proteomyxa, 233 



Proterosjwngia, 25S; hatckeli, 258 

 Protoclepsis occidcntalis, 654 

 Protococcaceae, 156 

 Protococcales, 1 43 

 Protosiphon, 156; botryoides, 156 

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



gophora; Sarcodina 

 Psamathiomyia (lar\a), 945 

 Psephenus (adult), 942 

 Pseudalona, 718 



PseudcKlirtlugia, 229; gradlis, 229 

 Pseudoccistcs, 617; rotifer, 617 



