GENERAL, INDEX. 
485 
Page 
Lepomis megalotis 6, 253, 257 
miniatus - - i— 257 
pallidus 32,253,258 
symmetrieus.. - - 257 
Leptodora 375,408,417 
kindtii 400, 401, 406, 408, 410, 411, 414 
leuchtenbergianum, Diaphanosoma 387,400,405,406,410 
Leucisus rutilus. 1 417 
Leueorhinia intacta 306 
Lewis, Sara I., and E. P. Churchill, jr. : Food and feed- 
ing in freshwater mussels 439, 471 
Leydigia quadrangularis 400 
Libellula— 32,243 
Liberty Lake, Wash.: 
description 88 
fish.. 72 
plankton 88,128 
thermal changes and gas conditions of ...67, 117 
liberus, Graphoderes 263 
life histories of water beetles in fishponds at Fairport, 
Iowa 231-345 
life history of the scavenger water beetle, Hydrous (Hy- 
drophilus) triangularis, and its economic relation to 
fish breeding... . 9-38 
ligamentina, Lampsilis 440 
light oils, toxicity of for Limnoria 224 
lignorum, Limnoria t... 221-230 
lilies, pond 267 
limbatus, Gyrinus.. 237,263,308,309 
limi, Umbra 4 
Limnological observations in theupper Mississippi, 1921.247-438 
composition of plankton 396 
lakes.. 406 
river 403 
tributaries. 410 
Copepoda and Cladocera, distribution of. 387 
Lake Keokuk 389 
Lake Pepin. 394 
river 387 
discussion and conclusions.. 411 
plankton and the fisheries 415 
potamoplankton 411 
investigation, method of 347 
boat and equipment. 353 
plankton, determination of._ 354 
schedule of localities 351 
stations 355 
physiography 357 
chemical constituents of water 371 
discharge 369 
flow of sediment 370 
Lake Keokuk.. 360 
Lake Pepin. 359 
Lake St. Croix... 360 
stages 362 
temperature of water 373 
the river 357 
transparency of water 371 
velocity of current 366 
plankton and detritus 375 
horizontal distribution in river 379 
Lake Keokuk 380 
LakePepin 382 
Lake St. Croix.. 384 
pump and net collections 385 
vertical distribution in river _ _ 379 
volume , 375 
Page 
Limnoria, description of 222 
lignorum 221-230 
toxicities of coal tar creosote, creosote distillates, 
and individual constituents for 221-230 
, Helophorus... 263 
littoralis, Menticirrhus.. 195,196 
description and occurrence. 195, 196 
long-eared sunfish 253, 257 
longicaudus, Phacus 399, 404, 461 
longifolia, Sagittaria 361 
longimanus, Bytotrephes 417 
longirostris, Bosmina. 400, 405, 410 
longiseta, Triarthra 400,405,410 
longispina, Daphnia. 400,405 
Loon Lake, Wash.: 
depth, temperature, and dissolved gases 117 
description 88 
fish 72 
mackinaw trout 74 
plankton 88,128 
Louisiana Cove, salmon-tagging experiment at 43-45 
Louisiana fishes, food of. 257 
Lower Twin Lake, Idaho: 
depth, temperature, and dissolved gases. _ 117 
description 89 
plankton 89, 128 
lucidus, Albumus 417 
luna, Cathypna 400 
Luna Lake, Wash.: 
plankton. 100,128 
thermal changes and gas conditions of 70, 117 
lunaris, Monostyla 400,409 
luteola, Lampsilis 203-219, 440, 444, 446, 448-457, 463, 465 
Lymnsea peregra 284 
stagnalis 284 
stagnalis lilliahse 245 
Lyngbya.. 402,409,456,464 
sp. 361,369 
macrolepidotum, Moxostoma 253 
macropterus, Centrarchus... 5 
maculosus, Laccophilus... 236-238, 247, 263, 265, 266, 276, 287-291 
major, Navicuia 402 
mantle cells of glochidium 204 
mantle condition (new) exhibited by Lampsilis luteola. 203-219 
mantle (larval) of fresh-water mussels during parasitism, 
Significance of 203-219 
marbled bullhead. 253 
Margaritana margaritifera 444 
margaritifera, Margaritana 444 
marginata, Anodonta 444 
marine wood borer, Limnoria lignorum, Toxicities of 
coal-tar creosote, creosote distillates, and individual con- 
stituents for.. 221-230 
Martha, Lake, Wash.: 
carbon dioxide content 71 
fish 72 
plankton.. 70,100,129 
thermal changes and gas conditions of 70, 117 
Mastigophora 399,401 
mayfly larvae 400,404 
Medical Lake, Wash.: 
carbon dioxide content of 71 
depth, temperature, and dissolved gases 118 
description 89 
plankton 89,129 
megalotis, Lepomis 6,253,257 
