of the Fishery Board for Scotland. 
Plankton, sira-, characters of, (15) 302. 
—— styli-, (15) 303. 
—— tricho-, characters of, (15) 302. 
tripos-, characters of, (15) 302. 
Planorbis albus, (8) 336; (9) 271, 276, 
281, 285 ; (13) 249; (15) 320, 331, 332; 
(16) 251 ; (17) 139, 155, 159, 185. 
contortus, (8) 336, 341; (9) 271, 276, 
281, 284, 285 ; (13) 249; (15) 320, 330, 
soz (L7 155, 159; 185. 
—— glaber, (13) 244 ; (15) 330, 332; (17) 
139, 185. 
nautileus, (9) 271, 276, 288; (13) 
188, 244; (14) 239 ; (15) 320, 332; (16) 
2515 257, 259); (7) 159), 185. 
var. cristata, (13) 244. 
nitidus, (9) 284; (13) 249 ; (15) 320 
(17) 1389, 159, 185. 
spirorbis, (8) 339 ; (9) 283, 284. 
vortex, (9) 285. 
Planorbulina mediterranensis, (15) 167. 
Platichthys stellatus, (18) 353. 
Platophrys, (18) 357. 
laterna. See Scald-tish. 
Platybdella sole, (19) 139. 
Platychelipus littoralis, (11) 203, 205 ; 
(15) 317. 
Platypsyllus minor, (20) 449, 455. 
Platysomatichthys hippoglossoides, 
3De: 
Playfair, Sir Lyon, (10) 173. 
Piectanocotyle lorenzii, (23) 116. 
Pleonexes gammarodes, (15) 141. 
Pleurobranchus plumula, (15) 116. 
Pleurogonium merme, (17) 266 ; (19) 236, 
272. 
rubicundum, (17) 266. 
spinosissimum (17) 256; (19) 272. 
Pleuromma armatum, (15) 147. 
Pleuronectes cynoglossus. See Witch. 
—— flesus. See Flounder. 
—— limanda. See Dab, common. 
megastoma. See Megrim. 
microcephalus. See Dab, lemon. 
— platessa. See Plaice. 
Pleuronectid, B., eggs and larve of, (9) 
319. 
Pleuronectide, (18) 351, 352; and see 
Flat-fishes. 
Pleuronectids, (7) 
306. 
— remarks on young, (10) 274. 
young, specimens of, (11) 246. 
Pleuronectinz, (18) 351. 352, 353, 358. 
Pleuronichthys, (18) 353. 
Pleurophyllidia lovent, (7) 325. 
Pleurosigma acuminatum, (9) 274. 
spencerit, (9) 274. 
Pleurotoma septangularis, (20) 522. 
trevelyana, (20) 522. 
turricola, (20) 522. 
Pleuroxus hamatus, (9) 294. 
— hastatus, (9) 294. 
levis, (9) 277, 294; (13) 250; (15) 
321. 
trigonellus, (9) 273, 277, 283, 294 ; 
(12) 286 ; (13) 245, 250; (14) 168; (15) 
321, 331, 333; (17) 140, 150, 155, 185, 
&e. 
truncata, (9) 294. 
(18) 
post-larval forms, 
231 
Pleuroxus uncinatus, (9) 273, 275, 277, 
294; (13) 250; (15) 321; (17) 140, 
160, 164, 185. 
Pecilopsetia, (18) 361. 
Podatlirius typicus, (6) 250, 274. 
Podoceropsis excavata, (15) 141 ; (20) 501. 
rimapalma, (6) 248. 
sophia, (6) 248 ; (15) 141. 
Podocerus capillatus, (6) 249. 
cumbrensis, (16) 262. 
—— falcatus, (6) 249. 
—— Herdmani, (14) 161; (16) 262. 
— palmatus, (17) 266. 
pelagicus, (6) 249. 
—— pulchellus, (6) 249. 
pusillus, (14) 161 ; (15) 141 ; (17) 265. 
Podon intermedius, (15) 142, 305, 306, 
307, 308, 310, 311, 315; (20) 476. 
— leuckariti, (20) 476, 532, 533. 
attacking post-larval fish, (22) 
279. 
—— polyphemoides, (9) 308; (15) 142; 
(16) 210 ; (20) 476, 477. 
Podopsis slabbert, (6) 254. 
Pogge. See Armed bullhead. 
Poisoning by raw fish, (7) 408. 
Pole-dab. See Witch. 
Pollan (Coregonus pollan), 
period of, (4) 252. 
Pollack (Gadus pollachius), (18) 283. 
anatomical differences from cod and 
coal-fish, (20) 250. 
comparison between, and cod and 
coal-fish, (20) 228, 244. 
development of, (14) 171. 
distribution of, (21) 60. 
— eggs of, (10) 288 ; (14) 171; (17) 82, 
83, 93, 96. 
food of, (7) 240; (8) 251 ; (19) 267 ; 
(20) 517. 
habits of young of, (4) 209. 
hatched in United States, (13) 337. 
in Loch Fyne, (4) 233 ; (15) 111. 
migration of, (21) 61. 
osteology of, (20) 228, 251. 
parasites of, (18) 153 ; (19) 121, 150; 
(20) 291 ; (23) 108. 
proportion of males to females, (8) 
spawning 
—-- quantities landed by trawlers, (21) 
61. 
—— spawning period of, (4) 248; (7) 
194; (8) 268; (11) 246; (17) 99; (20) 
251; (21) 61. 
specific description of, (20) 248. 
Polycarpa rustica, (15) 114. 
Polycera quadrilineata, (15) 116. 
Polycirrus aurantiacus, (15) 158. 
Polycope compressa, (7) 318, 319. 
orbicularis, (7) 319 ; (8) 325; (15) 145. 
punctata, (15) 145. 
Polydora, (4) 217. 
(Leucodore) ciliata, (9) 400. 
Polymima nasidensis, (15) 158. 
nebulosa, (15) 158. 
Polymorphina compressa, (8) 316; (16) 
277. 
gibba, (7) 315; (15) 167. 
— lactea, (7) 315; (15) 166. 
lanceolata, (16) 277. 
