INDEX 



725 



Nephthydidae, 289. 



Nephthyidae, 135. 



Nephthys, 289. 



Neptunea, 558. 



Nereidae, 288. 



Nereidiformia, 283. 



Nereis, 288. 



Nerita, 534. 



Neritidae, 534. 



Nettle organ, 86. 



Neuropodium, 282. 



nickliniana ( Paludestrina ) , 

 543. 



Nicomache, 299. 



Nidamental glands, 604. 



nidicola (Lycosa), 433. 



niger (Ariolimax), 528. 



nigra (Ascidia), 667. 



nigra (Modiolaria), 572. 



nigrescens (Astacus), 390. 



nigrescens (Mermis), 219. 



nigrocincta (Triforis), 546. 



nigropalpis (Pardosa), 

 433. 



nigrum (Bittium), 546. 



nigrum (Botrylloides), 669. 



niloticus (Trochus), 532. 



nitida (Plumatella), 263. 



nitida (Zonitoides), 525. 



nitidulum (Chaetoderma), 

 484. 



nitidus (Liacarus), 443. 



Nitzschia, 174. 



nivea (Scutigerella), 466. 



noae (Area), 571. 



Noah's ark, 571. 



nobile (Corallium), 135. 



Noctiluca, 42. 



nodiferus (Triton), 551. 



nodulosa (Bunodera), 185. 



nordmanni (Evadne), 338. 



Northern crab, 396. 



norvegica (Teredo), 599. 



Noteus, 240. 



Nothrus, 443. 



Notochord, 652. 



Notomastus, 297. 



Notommata, 238. 



Notommatidae, 237. 



Notopodium, 282. 



Notops, 237. 



Nuclearia, 22. 



Nucleus (in Salpa), 660. 



Nucula, 568. 



Nuculidae, 568. 



Nuda (Ctenophora), 154. 



Nuda (Rhizopoda), 119. 



Nudibranchiata, 500. 



nudus (Sipunculus), 274. 



Number of described spe- 

 cies, 10. 



nutans (Pedicellina), 248. 



Nut-brown cowry, 550. 

 nutricula ( Turritopsis ) , 



102. 

 nuttalliana (Fluminicola) 



542. 



Nuttallina, 488. 

 Nymph (in mites), 437. 

 Nymphon, 461. 

 Nymphonidae, 460. 



OBELIA, 113. 



obesa (Clubiona), 429. 



obiculare (Tanystylum), 



460. 



obiculata (Helicina), 534. 

 obliqua (Succinea), 518. 

 Obisiidae, 410. 

 Obisium, 410. 

 oblonga (Clavelina), 668. 

 oblongum (Polystoma), 



175. 



oblongus (Chelanops), 410. 

 oblongus (Tibellus), 429. 

 obrussa (Lymnsea), 510. 

 obscura (Margarita), 533. 

 obscura (Podarke), 288. 

 obsoleta (Nassa), 558. 

 obtusa (Dero), 309. 

 occidentale (Dentalium), 



491. 

 occidentale (Sphaerium), 



586. 

 occidentalis (Aporrhais), 



549. 

 occidentalis (Cotylogaster), 



178. 

 occidualis (Halipegus), 



187. 



Oceania, 115. 

 oceanica (Ligyda), 380. 

 ocellata (Halopsis), 116. 

 Ocellate sense organs, 89. 

 ocellatus (Ovalipes), 398. 

 ochracea (Asterias), 632. 

 ochracea (Ectopleura), 



102. 

 ochraceus (Amphiporus), 



211. 



Octocotylinae, 176. 

 octonaria ( Cunoctantha ) , 



121. 



Octopoda, 612. 

 Octopodidae, 613. 

 Octopus, 613. 

 Ocular plate, 640. 

 oculata (Chalina), 82. 

 oculifera (Potamilla), 301. 

 Oculina, 147. 

 Oculinidae, 147. 

 Ocypoda, 399. 

 Ocypodidae, 399. 

 Odinia, 633. 



Odostomia, 554. 



Oecistes, 234. 



Oerstedia, 213. 



Oesophageal bulb, 214. 



officinalis (Euspongia), 84. 



offlcinalis (Sepia), 608. 



ohionis (Palaemon), 387. 



Oikomonas, 27. 



Oikoplast, 658. 



Oikopleura, 658. 



Oithona, 347. 



oleacea (Eulima), 553. 



oligactis (Hydra), 92. 



Oligochseta, 303. 



Oliva, 560. 



olivacea (Ophioderma), 

 636. 



Olivella, 560. 



Olividae, 560. 



olor (Lacrymaria), 52. 



Ommastrephes, 610. 



Ommastrephidae, 610. 



Ommatoids, 407. 



Omphalina, 524. 



Onchidella, 515. 



Onchidiidae, 515. 



Onchidoris, 502. 



Onchobothriidae, 195. 



Onchosphere, 190. 



Onicidae, 378. 



Oniscus, 378. 



Onychodromus, 62. 



Onychophora, 462. 



Onychoteuthidae, 611. 



Onychoteuthis, 611. 



Ooecium, 248. 



opacus (Microphallus), 186. 



Opalina, 57. 



opalina (Arabella), 291. 



Opalinidae, 57. 



Opercularella, 112. 



Opercularia, 67. 



operculatum (Amphi- 

 dinium), 41. 



Operculum : 



in Bryozoa, 249 ; in Gas- 

 tropoda, 492 ; in Hydro- 

 medusae, 104; in Limu- 

 lus, 401 ; in Polychseta, 

 302. 



Opheliidae, 298. 



Ophiacantha, 637. 



Ophiacanthidae, 637. 



ophidioidea (Cristatella), 

 264. 



Ophioderma, 636. 



Ophiodermatidae, 635. 



Ophiolepididae, 636. 



Ophiomyxa, 637. 



Ophiomyxidae, 637. 



Ophiopholis, 636. 



Ophiothrix, 637. 



