Index 
Pisidium, 95, 96, 107, TO: 212. 
126, 134, 144, 148, 160, 176-179. 
137, 198, 212, 215, 217, 227, 246- 
249, 261, 263, 287, 297, 321. 
Pisidium abditum, 45, 53, 60, 80, 
161, 212, 288. 
Pisidium quilaterale, 60, 95, 
107, 126, 142, 143, 248, 261, 271, 
287. 
Pisidium compressum, 45, 53, 96, 
106, 126, 142, 143, 261, 271, 287. 
Pisidium compressum levigatum, 
45, 60, 80, 95, 96, 106, 126, 134, 
142, 143, 248, 261, 271, 287. 
Pisidium ferrugineum, 80, 95, 106, 
142, 143, 261, 287. 
Pisidium henslowanum, 60, 107, 
142, 143, 165, 212, 215, 248, 261, 
287, 322. 
Pisidium variabile, 45, 60, 80, 95, 
BG eLO7,, 126; 134, 142. 143° 261, 
Zilla e287. 
Placobdella montifera, 227, 246. 
Placobdella parasitica, 51, 297. 
Placobdella phalera, 65, 95, 297. 
Placobdella picta, 40, 99, 100, 297. 
Placobdella rugosa, 41, 95, 297. 
Placopharynx carinata, 169. 
Placopharynx duquesnei, 169, 212, 
271. 
Plaice, 115. 
Planaria, 192, 295. 
Plankton, 117, 119, 137, 143-146, 
154, 155, 183, 191, 210, 211; 298, 
313. 
Planorbis, 78, 103, 110, 123, 130, 
135, 136, 144, 150-152, 158, 159, 
164, 168, 173, 178-180, 183-187, 
194, 197, 198, 209, 212, 218, 225, 
230, 235, 238, 246, 249, 276. 
Planorbis albus, 234, 246, 280. 
Planorbis antrosus, 38, 47, 56, 57, 
62, 63, 70, 71, 78, 80, 81, 92, 95, 
107, 124, 126, 131, 137, 138, 141- 
143, 148, 149, 186-188, 200, 212, 
215, 217, 277, 279, 287-289, 321. 
Planorbis antrosus portagensis, 
125, 212. 
Planorbis bicarinatus, 148, 149, 
277, 279, 288. 
361 
Planorbis binneyi, 46, 56, 57, 63. 
75, 81, 83, 92, 107, 109, 121, 126 
139, 141-143, 248, 272, 275, 277. 
282, 287. 
Planorbis campanulatus, 38, 39. 
42, 44-47, 50-53, 56, 57, 62-65, 
68-71, 74, 77, 78, 80, 81, 83, 84, 
86-89, 92, 95, 96, 98-102. 105, 
LOM E2IS12.4- 196% 130, 131.134 
137-143, 148, 151, 186, 187, 200, 
2D 2165217. 
Planorbis corneus, 244. 
Planorbis erista, 149. 
Planorbis deflectus, 148, 171. 212. 
Planorbis exacuous, 80, 95, 100, 
107, 130, 188-141, 148, 187, 212, 
21D. Aliesed ls OBl., 287, 321. 
Planorbis hirsutus, 39, 45, 46, 57, 
59, 62, 64, 69, 78, 81, 87, 92, 93, 
95, 96, 99, 100, 104, 107, 121, 
122, 124, 130, 131, 134, 139, 140, 
148, 165, 195, 212, 215, 217, 271, 
230, 287. 
Planorbis lentus, 277. 
Planorbis parvus, 80, 88, 95, 100, 
107, 130, 138-141, 144, 148, 160, 
188; 210, 2122215):238 271280: 
287, 288. 
Planorbis trivolvis, 39, 50, 57, 59. 
1074150818: (80, Sls Bi49s- 
95, 98-100, 104, 105, 107, 126, 
129, 130, 137-141, 148, 149, 158, 
212, 217, 243, 275-277, 287-289. 
Planorbide, 276. 
Plants, 290. 
Plants, higher, 319-323. 
Platycentropus maculipennis, 77, 
98, 305. 
Platyhelminthes, 192, 193, 295. 
Platypeltis muticus, 230, 246. 
Plea striola, 231, 232, 305. 
Plecoptera, 302, 304. 
Plectonema terebrans, 244, 245. 
Pleurocera, 173, 212. 
Pleurocera elevatum, 243. 
Pleuroceride, 269. 
Pleurosigma, 145, 147. 
Pleuroxus, 180, 190. 
Plover, 234. 
Plover, upland, 235. 
