488 
GENERAL INDEX. 
Page 
Pediastrum, simplex 388,401,402, 404 
simplex duodenarium 461 
tetras - 461 
Pelocaris femorata 324 
Peltodytes. - 236, 244, 271 
edentulus 237, 238, 263, 266, 271-273 
adult, description and habits of 273 
distribution in Fairport fishponds. 263 
eggs 271 
larva, description and habits of _ _ 271 
migration 237 
pupa, description of 273 
pupation..- 273 
locomotion of- . 236 
Pend Oreille, Lake, Idaho: 
description 91,92 
plankton 92,93,120 
thermal changes and gas conditions of„_ 68, 69, 93, 118 
pentaSdricum, Tetreedron 461 
Pepin, Lake 347-438 
Copepoda and Cladocera 394 
distribution 394,395,408 
fluctuation in abundance _ 394 
physiography 359 
plankton... 377,382,383,399 
composition of - 399 
distribution 382,383 
mean volume - 382 
volume 377,382 
temperature of water 373 
transparency of water 371, 373 
velocity of current 369 
Perea flavescens 254 
perch, blue 6 
pirate 5,253 
red-bellied 6 
sand 5,171 
silver 171 
speckled 5 
sun 5 
white—. - 171 
yellow 254,255 
yellow-finned 171 
Peridinium sp 399, 404 
tabulatum 461 
perigrinus, Berosus 238,263,312 
perplexus, Enochrus 219,263 
Philydrus 321 
Phacus longieaudus 399, 404, 461 
pleuronectes 461 
Philydrus 265 
diffusus - 320 
hamiltoni 321 
nebulosus— 318 
ochraceus. 238,321 
migration of 238 
perplexus 321 
phoenicenteron, Navicula (Stauroneis) 402 
Phorasp 245 
Phyciodes tharos-. 306 
Phyllophaga 246 
phytoplankton 411,418 
piceus, Hydrous 9, 22, 23, 25, 333 
cap attachment on egg case 333 
pickerel 4 
pickerel frog- 248 
pickerel weed „ 267 
Page 
picta, Chrysemis 244 
pigmae, Umbra 4 
pigmy sunflsh 5 
pike, red-finned 4 
Pinaeus brasiliensis 163 
setiferus 163 
pintail 248 
pipiens, Rana 248 
pirate perch 5, 253 
placentula, Cocconeis 408 
Placopharynx duquesnei 253 
Plaeodorina illinoisensis 399, 402, 404 
Plagiola donaciformis 446,463 
plankton 349-355, 375-377, 379, 385, 411, 412, 414, 418, 444 
as fish food 416-419 
composition of 396,411 
definitionof. 376 
determination of, in Mississippi River -654 
distribution 350 
effect in increasing fish production. 418 
effect of water level on 412 
favorable and unfavorable conditions for 414 
fluctuation in quantity and constitution 412 
horizontal distribution of, in Mississippi River 379 
increase and decrease 414 
net and pump collections of 385 
occurrence in Mississippi River 349 
origin of ___ 412 
pump and net collections of. 385 
quantitative study of 355 
vertical distribution of in Mississippi River. 379 
volume of in Mississippi River 375 
volumetric determinations of. 377 
plankton and the fisheries 415 
planktonica, Anabaena 399,405 
platyeephalus, Ameiurus 2 
Platydorina caudata 399, 401, 402, 404, 405, 461 
sp ___ 461 
platyptera v. euryptera, Polyarthra— 400, 401, 403, 404, 406, 410 
Pleodorina 456,460 
californica 461 
pleuronectes, Phacus 461 
Pleurosigma spenceri 405, 408 
plicata, Quadrula 446,463 
Pogonias cromis 145, 196, 197 
description 197 
food.. 197 
migration 197 
occurrence. - - 196 
size 197 
Polyarthra — — 411 
platyptera v. euryptera 400, 401, 4C3, 404, 406, 410 
Polyodon spathula 253 
Pomoxis annularis 5, 253 
sparoides 5, 254, 257 
pondfish culture, Water beetles in relation to 231-345 
pond lilies - - 267 
pond snail 245 
pond sucker - 2 
Poronotus triacanthus — 162 
Port Moller, salmon- tagging experiments at 45, 46 
Potamogeton 11,31,35,265,409 
americanus - 360, 384, 408 
crispus 360, 384, 408 
illinoensis, occurrence on ponds at Fairport, Iowa... 265 
potamoplankton, composition of... 411 
Priest Lake, Idaho: 
description 92,94,95 
