INDEX 



Pelohatida, 371-373 



Peltodytes, 265, 266 



Peltroperla, 197 



Perca flavescens, 343-344 



Perch, 31, 74, 216, 325; com- 

 mon, 343-344; dwarf, see 

 daners; yellow, 152, 343- 



344 

 PercidcB, 343-345; see also 



perch 

 Perla, 195, 196; immarginata, 



194 

 PerlidcE, 195 

 Petromyzon marinus, 327- 



329 



PetromyzonidcE, 327-329 



PhcBophycecB, 47 



Phagocata gracilis, 126 



PhilapotamidcB, 253 



Philodinidce, 129 



Philotria, 79 



Phryganeids, 253 



Phoebe, 25 



Photosynthesis, or food mak- 

 ing, 9 



Phryganea, 255; vestita, 254 



PhryganeidcB, 249, 253 



Phy lactam (zmata, 135 



Phyllopoda, 160, 161-162, 

 161-163 



P^3'5a, 74, 302, 303-304; 

 gyrina, 310-31 1 ; hetero- 

 stropha, 311 



Phy sella gyrina, see Physa 

 gyrina 



Physidae, 3 10-31 1 



Pickerel, 31, 74, 216, 338-339 



Pickerel weeds, 13, 20, 58, 

 73, 76, 85-89, 220, 258 



Pie plate, white, for collect- 

 ing, 26 



Pike, wall-eyed, 343 



Pin, insect, 43 



"Pipe-moss", 107 



Pipettes, for collecting, 30 



Pisidium, 323; politum 

 decorum, 323; virginicum, 



323 

 Pitcher-plants, 59, 96-98 



Placohdella parasitica, 154 



Planaria, 1 19-126; aquarium 



study, 122-124; food, 122; 



form and habits, 119-121; 

 habitat, 121, 122; identifi- 

 cation, 124; milky, 122, 



125 



Planaria alpina, 122; macula- 

 ta, 121, 122, 125-126 



Planarians, Frontispiece, 8, 

 22, 23, 34, 36, 115, 119- 

 126, 144 



PlanorhidcB, 31 1-3 13 



Planorbis, 74, 256, 302; hir- 

 suliis, 312; trivolvis, 311 



Plankton, 22, 49, 294; collect- 

 ing of, 32-33 ; definition of, 

 16; organisms, 16, 17; or- 

 ganisms, reproductive cap- 

 acity of, 17; population of 

 lakes, 19 



Plant-lice, 70 



Plantains, water, 13, 73, 76, 

 78-79, 237, 279 



Plathemis, 217 



Plants, collecting, 30; distri- 

 bution of pond, 12-14; 

 emergent, 12-13; floating- 

 leaved, zone of, 13; higher, 

 58-103; in ponds, 12, 13, 

 14; in streams and marshes, 

 20; in rapids, 22; micro- 

 scopic, 32; simpler (algae), 

 46-55; water, for aquaria, 



39 



Plea, 227, 239 



Plecoptera (stoneflies), 179, 

 189, 193-213; PerlidcB, 195- 

 198; Pteronarcidce, 195; see 

 also E4>hemerida 



Plethodontidce, 362-366 



Pleuroceridce, 315 



PleiirodelidcB, 353-357 



Plumatella,'^iT,4., 135, 136 



Pliimatellidce, 135 



Podiira aquatica, 191 



Pollination, 68 ; arrowhead, 76 ; 

 pickerel- weeds, 87; pitcher- 

 plant, 96; water eel-grass, 

 82 ; white water-lily, 93 



Polycentropus, 253 



Polygonacece, 89-90 



Polygonum amphibium, 15, 

 89-90 



Polyzoa, see Bryozoa 



443 



