360 
Otters12355 23 
Oxyechus vociferus, 235, 246. 
Oxygen, 118, 119. 
Oyster, 119. 
PALEMONETES, 190. 
Palingenia, 190, 198. 
Paludestrina nickliniana, 269. 
Paludina, 198. 
Pandorina, 147. 
Paraponyx, 307. 
Parasites, 224. 
Parasites of mollusks, 238-246. 
Parasites of fishes, 192, 193, 199, 
204, 238. 
Parnide, 309. 
Pearse, 218, 302. 
Pecatonica River, 171. 
Pectose, 118. 
Pediastrum, 145, 147. 
Pediastrum baryanum, 145. 
Pediastrum pertusum, 146. 
Pekin, IJll., 171. 
Pelecypoda, 252, 259. 
Peoria, Ill., 190. 
Perea, 189, 199, .242. 
Perea flavescens, 154, 189, 208, 
2 A 2A 225. 242 320) 
Perch) 545, 155, 19I—194.7 212, 
PAN et, Allis 
Perch, American, 189. 
Perch, log, 194. 
Perch, pirate, 225. 
Perch, white, 197, 213, 214. 
Perch, yellow, 189, 208, 214, 22 
223 22522 259-9200) 269. 20 
286, 295, 299-302, 304, 311, 32 
Percina, 189. 
Percina caprodes, 214. 
Percina caprodes zebra, 194. * 
Perla, 58, 102, 244, 304. 
Perlide, 304. 
Perthostoma, 225. : 
Petersen; 15:5 1b73, 19: 1205 152, 
2Oeeole eeoiGs 
Phacus, 146. 
Phacus longicaudus, 145. 
Phillips Point, 28. 
Philhydrus cinctus, 74, 94, 303. 
Phryganeide, 182, 190, 195. 
Phylactolemata, 296. 
Index 
Phyllopoda, 299. 
Phylocentropus, 62, 96, 307. 
Physa, 78, 108, 129, 131, 133-136, 
144, 148, 149, 152, 158, 160, 168, 
174-176, 180, 183-185, 212, 218, 
224, 225, 230, 246, 249, 272, 275, 
316. 
Physa anatina, 243. 
Physa ancillaria, 148, 161, 
191, 212, 272, 288. 
183, 
Physa ancillaria magnalacustris, 
110. 
Physa ancillaria warreniana, 39, 
42, 44-47, 50, 51, 56, 57, 62-64, 
66, 69, 70; 71, 74, 75, 77% (8,30: 
81, 83, 86-89, 92, 93, 95, 96, 98— 
100; 102; 105; 107, 109) T2123, 
124, 126, 130, 131, 1386-148, 172, 
W765 L8is 212, 215. Qipao 
212, 213, 282, 287. 
Physa gyrina, 51, 59, 102, 104, 
107, 130, 139, 141, 149, 200, 243, 
271, 273, 275, 287, 289. 
Physa heterostropha, 148, 149, 
176, 191, 200, 205, 212, 228, 229, 
238, 242, 246, 248, 272, 275, 288, 
289. 
Physa integra, 42, 57, 70, 71, 80, 
95, 107, 142, 1438, 149, 271, 273, 
287, 289. 
Physa niagarensis, 273. 
Physa sayii, 272. 
Physide, 272. 
Pickerel, 213, 301, 319. 
Pickerel, chain, 177, 201, 
303, 307. 
Pickerel grass, 225. 
Pickerel-weed, 38, 39, 42, 45, 48, 
50, 53, 60, 64, 65, 68, 76, 77, 81. 
94-99, 137, 267, 273, 277, 279, 
280, 282, 285, 294. 
Pietérs, 31, 114, 291, 292. 
Pigeon River, 279. 
Pike, 311. 
Pike, common, 177. 
Pike, grass, 201. 
Pike, green, 177. 
Pike, sand, 2138, 222. 
Pike, wall-eyed, 213. 
Pilsbry, 268. 
296, 
