BULLETIN OF THE BUREAU OP FISHERIES 



Section 1. — General survey of the animal Pa s e 

 plankton (zobplankton) — Continued. 

 The more important groups of plank- 

 tonic animals — Continued. 

 Crustaceans — Continued. 

 Copepods — Continued . 



Euchceta norvegica 230 



Euchseta spinosa 237 



Eucheirella rostrata 237 



Eurytemora herdmani 238 



Gaidius tenuispinis 238 



Halithalestris croni 239 



Harpactieus littoralis 241 



Harpacticus uniremis 242 



Heterorhabdus spinif rons 242 



Idya furcata 242 



Labidocera restiva 243 



Lucicutia grandis 244 



Metis ignea 244 



Mecynocera clausi 245 



Metridia longa 245 



Metridia lucens 253 



Monstrilla serricornis 263 



Oithona similis 264 



Paracalanus parvus 264 



Parathalestris jacksoui 271 



Phyllopus bidentatus 27 1 



Pleuromamma 272 



Pseudocalanus elongatus 275 



Rhincalanus cornutus 283 



Rhincalanus nasutus 284 



Scolecithricella minor 285 



Temora longicornis 287 



Temora turbinata 293 



Tortanus discaudatus 294 



Undeuchceta major 295 



Undeuchoeta minor 295 



Zaus abbreviatus 296 



Zaus spinatus 296 



Table of copepods in vertical 

 hauls, Mav to October, 1915, 



by Dr. C. B. Wilson 297 



Table of copepods in vertical 

 hauls, February to May, 1920, 



by Dr. C. B. Wilson 299 



Table of copepods in surface 

 hauls, February to May, 1920, 



by Dr. C. B. Wilson 303 



Table of copepods in horizontal 

 hauls, December, 1920, and 

 January and March, 1921, by 



Dr. C. B. Wilson 304 



Supplementary note on the cope- 

 pods, by Dr. C. B. Wilson ... 305 

 Daphnids (Cladocera) 307 



Section 1. — General survey of the animal Page 

 plankton (zooplankton) — Continued. 

 The more important groups of plank- 

 tonic animals — Continued. 



Worms 308 



Glass worms (chretognaths) 308 



Sagil ta elegans 308 



Sagit ta serratodentata 320 



Sagitta maxima 324 



Sagit ta lyra 327 



Sagit ta hexaptera 328 



Eukrohnia hamata 328 



Other chaetognaths 334 



Tomopterids 334 



Tomopteris catharina 334 



Tomopteris septentrionalis 340 



Pelagic coelenterates 340 



Hydroid medusae 341 



Melicertum campanula 34 1 



Staurophora mertensii 342 



Pty chogena lactea 348 



Mitrocoma cruciata 348 



Phialidium languidum 350 



Trachomedusre 352 



Aglantha digitale 352 



Scyphomedusae 357 



Cyanea capillata var. arctica — 357 



Aurelia aurita 362 



Other scyphomeduste 364 



Ctenophores 365 



Pleurobrachia pileus 365 



Mertensia ovum 371 



Bolinopsis inf undibulum 372 



Beroe cucumis 372 



Other ctenophores 376 



Siphonophores 376 



Stephanomia cara 377 



Diphyes arctica 379 



Other siphonophores 379 



Pelagic hydroids 379 



Section 2. — General survey of the plank- 

 tonic plants (phytoplankton) and 



unicellular animals 381 



Phy toplanktonic communities 383 



Quantitative distribution of the phyto- 

 plankton 397 



Peridinians 40? 



Ceratium 407 



Other peridinians 416 



Diatoms * 17 



List of diatoms at representative 



localities 423 



