632 
Physa gyrina—continued. 
473, 474, 476, 479, 484, 485, 486, 
488, 489, 492. 
oleacea, 489, 492. 
Physidez, 492. 
Pickerel, 450. 
Pigs, 569. 
Pike, 388, 398, 403, 413, 415, 417, 422. 
See also Esox lucius. 
Grass, 387, 398, 403, 417, 430. 
also Esox vermiculatus. 
-perch, 389, 399, 404, 431. See also 
Stizostedion vitreum. 
Pimephales notatus, 385, 419, 437. 
also Minnow Blunt-nosed. 
promelas, 385, 437. See also Minnow, 
Black-head. 
Pipistrellus subflavus, 595-596. 
Pirate-perch, 388, 398, 403, 417, 421 
425, 430. See also Alphredoderus 
sayanus. 
Placopharynx duquesnii, 385, 395, 404. 
Plagiopyla nasuta, 115, 126. 
Planorbide, 493. 
Planorbis, 493. 
exacuous, 462, 467, 486, 488, 493. 
parvus, 287, 454, 473, 486, 488, 493. 
trivolvis, 450, 454, 456, 459, 460, 473, 
474, 482, 484, 486, 488, 493. 
Planorbula, 493. 
Platydorina, 3, 68. 
caudata, 85, 292, 323. 
Platygobio gracilis, 387. 
Chub, Flat-headed. 
Platyhelminthes, 133-135. 
Platynus punctiformis, 483. 
Plectrothrips, 370, 372. 
antennatus, 370. 
Pleodorina, 68, 86. 
californica, 86, 292, 323. 
illinoisensis, 3, 86. 
Pleuronema chrysalis, 127. 
Pleurosigma, 57. 
Pleuroxus denticulatus, 224, 256. 
hamatus, 256. 
Ploesoma lenticulare, 203. 
Ploima, 139, 144—219, 292, 328. 
See 
See also 
See 
INDEX 
Plumatella, 288, 340. 
repens, 289. 
Pocket-gopher, 560-563. 
Podophrya fixa, 131. 
Poison-ivy, or Poison-oak, 453. 
Polyarthra, 72, 149, 154, 168, 208, 209. 
Pyke), PMG ZIVS Bil). D0). 
platyptera, 72, 127, 208-209, 292, 
DO ODE 
var. euryptera, 208. 
var., 208. 
Polyedrium bifurcatum, 30. 
gracile, 30. 
trigonum, 30. 
forma minus, 30. 
var. tetragonum, 30. 
Polygonum hydropiperoides, 473. 
muhlenbergii, 450. 
pennsylvanicum, 473. 
Polygyra, 496. 
albolabris, 455, 459, 480, 482, 485, 
487, 496. 
fraterna, 455, 459, 462, 485, 487, 496, 
monodon, 496. 
thyroides, 455, 462, 477, 480, 485, 
487, 496. 
Polygyrine, 496. 
Polyodon spathula, 384. See also Pad- 
dle-fish. 
Pomolobus chrysochloris, 384. See also 
Skipjack. 
Pomoxis annularis, 388, 413. See also 
Crappie, White. 
sparoides, 388, 437. 
Black. 
Pontugulasia incisa, 112. 
Poplar, Carolina, 375. 
Populus, 457, 463. 
deltoides, 463. 
tremuloides, 451, 458, 463, 465, 466, 
475, 479, 481. 
Porifera, 132. 
Poultry, 231) S38 oO soon 
Prairie-chickens, 580. 
Prairie-dogs, 605. 
Prairie Meadow-mouse, 551-556. 
-mouse, White-footed, 504, 505, 507, 
See also Crappie, 
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