INDEX. 



471 



Page. 



Nudibranchiata 664 



Obelia commissuralis 728, 327, 334, 393, 



407, 411, 425 



diaphana 727, 327, 334, 429 



dichotoma 728, 407, 411, 425 



divaricata - - - 727 



flabellata 728, 390, 393, 497 



fusiformis 407,411,424 



gelatinosa 728, 391, 393, 482 



geniculata - - -727, 334, 393, 407, 411, 

 424, 487, 494, 495, 496 



longissinia 728 



polygena 727 



pyriformis 727, 334, 390, 393 



species 476, 363, 376, 447, 454 



Oceania languida 725, 454 



Ocean shores and outer cold waters, 



fauna of ------ 484 



Ocellated flounder 519 



Ocypoda arenaria . . .545, 745, 336, 337, 364, 



534 



Ocypode pugilator 545 



Odostomia bisuturalis . . .656, 307, 333, 383, 



393, 423 

 dealbata 656 



exigua 



656 



fnsca .656, 307, 333, 393, 423, 435 

 impressa..660, 656, 333, 418, 423 



iiisculpta 656 



limuoidea 653 



prod n ota 656, 333, 418, 423 



seminnda -657, 418, 423, 428, 435 

 trifida 656, 307, 333, 393, 418, 423 



OligochcBta - . 622 



Ommastrepbes Bartrauiii 635 



illecebrosa 634, 441, 453 



sagittatus 634 



Onchidoris pallida 665, 495 



Oniscus 399 



Open coast, fauna of gravelly bot 

 toms 50( 



Open coast, fauna of muddy bot 

 toms 506 



Open coast, fauna of rocky bot 

 toms 491 



Open coast, fauna of sandy bot 

 toms 50( 



Open coast, fauna of rocky shores.. 48t 

 Open coast, fauna of sandy shores.. 48 



Ophelia simplex 603, 319, 332, 41 



Ophidium marginatum 33 



Ophiocoma bellis 71 



neglecta 72 



Ophioderma olivuceum 71 



Ophiolepis scolopendrica 71 



Page. 



phiolepis tennis 720 



phiopholis aculeata 719, 400, 496, 517 



bellis 719,400 



scolopendrica 719 



)phiura bellis 719 



elegans 720 



olivacea 719, 363, 366, 427, 429 



)phiuroidea 719 



)rchestia agilis .555, 314, 331, 336, 364, 462, 



464, 486 



longicornis 556 



megalophthalma 556 



palustris 555, 468 



Orcyuus thunuina 516 



)rthagoriscu8 mola 578 



Drthopyxis caliculata . . . 726, 334, 408, 411, 



424 



poteriurn 726 



3steodesma hyaliua 672 



Dstrea borealis 697 



Cauadeusis 697 



Islaudica 698 



Virgiuiana . . .697, 748, 310, 333, 374, 

 378, 388, 393, 401, 410, 424, 435, 453 



Virginica 697 



Otion Cuvieri 580 



Outer coast, fauna of, on rocky 



shores 485 



Outer coast, fauna of, on sam .y 



shores 489 



Outer coast, fauna of, ou gravelly 



bottoms 500 



Outer coast, fauna of, on rocky 



bottoms 491 



Outer coast, fauna of, on sandy 



bottoms 500 



Outer coast, list of species of 



muddy bottoms 511 



Outer coast, list of species of 



rocky bottoms 498 



Outer coast, list of species of rocky 



shores 487 



Outer coast, list of species of sandy 



and gravelly bottoms 504 



Outer coast, list of species of sandy 



shores 490 



Oyster 472, 355 



Oyster-beds in brackish waters, 



animals inhabiting 472 



Oyster-beds in brackish waters, list 



of species inhabiting 476 



Oyster-crab 367 



Pagurus Bernhardus 548 



lougicarpus 549 



pollicaris 548 



