226 



Part IIL—Tu:enty- 



thircl Annual Report 



Orchestia mediterranea, (17) 264. 

 Orchomene batei, (12) 262; (15) 137. 



humilis, (19) 258. 



serrata, (6) 246 ; (7) 327. 



Orchomenella minuta, (15) 137. 

 iwliwl, (20) 516. 



Orcynus thynnus. See Tunny, short- 

 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. See 



Fauna, invertebrate. 

 Ostrea edulis, (15) 123. 

 Otoliths of cod, lines of growth in, (23) 



128. 



of fishes, lines of growth in, (23) 



126, 128. 



of herring, lines of growth in, (23) 



127. 



of plaice, lines of growth in, (23) 



128. 



Otter-trawl, efficiency of, compared with 

 beam -trawl, (20) 118 ; (21) 30. 



escape of small fishes from, (20) 



327. 



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 e^gs 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) 



5, 171. 



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. 



Oyster-beds, statistics regarding, (14) 

 261, 262. 



temperature and salinity of 



water on, (14) 271. 

 Ovster-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 Xew Zealand, (9) 400. 



research on worm disease in Austra- 

 lian, (9) 400. 

 Oysters, (8) 17. 



exported from Holland, (13) 341. 



P 



Paehydesma crassatdloides, (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. 



forbesii, (6) 258. 



hyndnianni, (6) 258. 



kevis, (6) 258. 



thomsoni, (6) 258. 



ulidianus, (6) 258. 



Pabtmon squilla, (6) 261. 



Palinuru8, spawning period of, (6) 299. 



vulgaris, (7) 385 ; (15) 131. 



Palmipes membranacea, (8) 332. 



placenta, (20) 309, 319, 324. 



Pandalina brevirostris, (19) 279 ; (20) 



501, 516. 



Pandalus, spawning period of, (6) 299. 



annul icorni*, (6) 261. 



brevirostris, (6) 261 ; (15) 132 ; (16) 



156, 157, 209. 



marginata, (18) 403. 



montagui, (15) 132; (16) 156, 157, 



209 ; (17) 266 ; (18) 403 ; (20) 480, 489, 



491, 500, &c. 

 Pandarus tricolor, (18) 157. 

 Panthalis cerstedi, (16) 273. 

 Paracalanus hibemicus, (9) 300 ; (15) 



147 ; (17) 271. 

 parvus, (12) 235 ; (15) 307, 308, 310. 



311, 312; (17) 248 ; (18) 383. 

 Paracypris polita, (15) 142. 

 Paradoxostoma abbreviation, (6) 245. 



affine, (8) 325 ; (15) 145. 



arcuatum, (8) 324, 325. 



ensiforme, (6) 245 ; (16) 264. 



fischeri, (8) 324. 



fltxuosum, (6) 245 ; (15) 145. 



hibernicum. (8) 324. 



— hodgei, (8) 325 ; (15) 145. 



obliquum, (5) 328; (8) 324; (16) 



264. 



normani, (16) 264. 



pulchellum, (15) 145. 



