226 
Orchestia mediterranea, (17) 264. 
Orchomene batei, (12) 262; (15) 137. 
= humilis, (19) 258. 
serrata, (6) 246 ; (7) 327. 
Orchomenella minuta, (15) 137. 
nana, (20) 516. 
Orcynus thynnus. 
finned. 
Organisms present in ‘‘red” cod, (6) 
204, 207. 
Orkney, fishing grounds off, (9) 182. 
— larval fishes of, (13) 269. 
pelagic eggs of fishes at, (13) 269. 
Orthagoriscus mola. See Sun-fish. 
Osmerus eperlanus. See Smelt. 
Osseous fishes, development of ovary 
and oviduct of, (6) 281. 
significance of the yolk in the 
eggs of, (6) 280. 
Ostracoda as herring-food, (4) 126. 
of lochs and inland waters. 
Fauna, invertebrate. 
Ostrea edulis, (15) 123. 
Otoliths of cod, lines of growth in, (23) 
128. 
—— of fishes, lines of growth in, (23) 
126, 128. 
ioe herring, lines of growth in, (23) 
12 
“= 
See Tunny, short- 
See 
2 mare plaice, lines of growth in, (23) 
Otter-trawl, efficiency of, compared with 
beam-trawl, (20) 118 ; (21) 30. 
— escape of small fishes from, (20) 
27. 
—— extent of bottom swept by, (20) 122. 
influence of introduction of, (20) 
84 
introduction of, (20) 118. 
—— relative proportion of flat fishes and 
round fishes caught by, (20) 123. 
—— statistics of catches with, compared 
with beam-trawl, (20) 123. 
— width and height of mouth of, when 
fishing, (20) 121, 
Ova. See Eggs. 
Ovarian eggs of teleostean fishes, matura- 
tion of, (16) 88. 
—— fluid, nature and composition of, in 
teleosteans, (16) 149. 
specific gravity of, (16) 138. 
Ovaries of teleostean fishes, (16) 92. 
of teleostean fishes, fluid of, (16) 93. 
Ovary and oviduct in osseous fishes, 
development of, (6) 281. 
Over-fishing and its remedies, (11) 12. 
— how to deal with it, (10) 188. 
of the sea and sea-fish culture, (10) 
Ap ilyple 
Oxyethira, sp., (14) 243. 
Oyster-beds of Firth of Forth, (14) 13, 
244 ; (15) 14. 
—— of Forth, cause of exhaustion of, 
(14) 262. 
comparison of, with productive 
beds, (14) 273. 
condition of, (14) 265. 
investigation of, (14) 265. 
—— —— remedial measures proposed, 
(14) 275. 
Part IT.—Twenty-third Annual Report 
Oyster-beds, statistics regarding, (14) 
261, 262. 
temperature and salinity of 
water on, (14) 271. 
Oyster-culture, (12) 387. 
in France and Holland, (8) 220. 
in Holland, (9) 415. 
in United States, (9) 402. 
in Zealand, investigation of, (6) 
306. 
suitability of Scottish waters for, 
(9) 184. 
Oyster fishery, decline of Irish, (6) 300. 
in Canada, (9) 397. 
in Denmark, (7) 406. 
in New South Wales, (9) 399. 
in New Zealand, (9) 400. 
research on worm disease in Austra- 
lian, (9) 400. 
Oysters, (8) 17. 
—— exported from Holland, (13) 341. 
P 
Pachydesma crassatelloides, (7) 341. 
Pagellus centrodontus. See Bream, com- 
mon sea-. 
Pagrus auratus, spawning period of, (4) 
244, 
Pagurus bernhardus, (6) 230, 236, 258 ; 
(11) 202, 206. 
Sorbesii, (6) 258. 
—— hyndmanni, (6) 258. 
lewis, (6) 258. 
— thomsoni, (6) 258. 
ulidianus, (6) 258. 
Palemon squilla, (6) 261. 
Palinurus, spawning period of, (6) 299. 
vulgaris, (7) 885; (15) 131. 
Palimnipes membranacea, (8) 3382. 
—- placenta, (20) 309, 319, 324. 
Pandalina brevirostris, (19) 279; (20) 
501, 516. 
Pandalus, spawning period of, (6) 299. 
annulicornis, (6) 261. 
brevirostris, (6) 261; (15) 132; (16) 
156, 157, 209. 
marginata, (18) 403. 
—— montagui, (15) 182; (16) 156, 157, 
209 ; (17) 266; (18) 403; (20) 480, 489, 
491, 500, &c. 
Pandarus bicolor, (18) 157. 
Panthalis erstedi, (16) 273. 
Paracalanus hibernicus, (9) 300 ; 
147 5 (17) 27a. 
—— parvus, (12) 235 ; (15) 307, 308, 310. 
311, 312; (17) 248; (18) 383. 
Paracypris polita, (15) 142. 
Paradoxostoma abbreviatum, (6) 245. 
affine, (8) 325 ; (15) 145. 
—— arcuatum, (8) 324, 325. 
ensiforme, (6) 245 ; (16) 264. 
—— fischeri, (8) 324. 
—— flexuosum, (6) 245 ; (15) 145. 
hibernicum, (8) 324. 
— hodgei, (8) 325; (15) 145. 
obliquum, (5) 328; (8) 324; (16) 
64 
(15) 
— normani, (16) 264. 
—— pulchellum, (15) 145. 
