Observing station,' at Gibraltar, 47 ; at 
Madeira, 52 ; at Tahiti, 777 ; at 
Valparaiso, 843 ; list of, 1026. 
Obsidian bladed spears, 717 ; description 
of, 718. 
Ocean currents, see Currents. 
Ocean, efforts to acquire a knowledge 
of the, xxxi ; movements of the, 25. 
Ocean physics, early history of, xliii. 
Ocean temperatures, see Temperature. 
Ocean water, see Sea water. 
Oceanites, 324, 765 ; 0. oceanicus, 436. 
Oceanitidae, 323, 329 ; peculiarities of, 323 ; 
resemblance of, to Procellariidae, 324. 
Ocnus, 379. 
Odacnemus bythius, 162. 
Octopus, 543. 
Oculina bcrmudensis, 146 ; 0. coronalis, 
146 ; 0. diffusa, 145, 146 ; 0. pallens, 
145, 146 ; 0. speciosa, 146 ; 0. valen- 
ciennesi, 145, 146 ; 0. varicosa, 145, 
146. 
Oculinidae, 792. 
Ocxjale mirabilis, 55. 
Ocypoda, 663 ; 0. ippeus, 187 ; 0. rhombea, 
149. 
Odontocyathus coronatus, 793. 
Odutsi, Island, 747 ; Peak, 747. 
(Ecodoma, 236. 
Oersted, Prof., 382. 
(Estrelata, 325 ; (E. lessoni, 358. 
“O’Higgins,” the, 873. 
Okabula, 747. 
Okhotsk, Sea of, 755. 
Oki Sima, 747. 
Olango Island, 647. 
Oldfield Anchorage, 870. 
Oleander, 143. 
Olfersia, 205. 
Oliver, Prof., 375, 943. 
Olland Island, 864. 
Olmedilla, 874. 
Olynthus, 570, 640. 
Ommastrephes oualaniensis, 518. 
Onchidiwm, 489. 
Onchopora sinclairii, 674. 
Onchoporidae, 674. 
Oncinopus aranea, 588. 
One Tree Island, 865. 
Oneirophanta mutabilis, 277, 757, 804. 
Onevah Islet, 477. 
Oniscus, 269 ; O. paradoxus, 878. 
Onychia caribcea, 136. 
Onychocrinus, 313. 
Oorhynchus, 857, 858; 0. aucJclandice, 860. 
Oosima, 748. 
Oosima Harbour, 746. 
Oot Island, 556. 
Open ocean, morning minimum of pressure 
in, 1001. 
NARRATIVE OF THE CRUISE. 
Ophiacantha, 172, 173 ; 0. cosmica, 833 ; 
0. segesta, 161 ; O. sentosa, 833; 0. 
troscheli, 161 ; O. vivipara, 394 ; pro- 
pagation of, 396. 
Ophidiidse, 520, 906. 
Ophiemus, 172. 
Ophiochytra epigrus, 775. 
Ophiocoma didelphis, 394. 
OpMogeron, 173. 
Opliioglossum pend ulum, 704. 
Ophioglypha, 173 ; O. bullata, 161 ; 0. hcx- 
aetis, 394 ; O. radiata, 628 ; O. undu- 
lata, 738. 
Ophiohelus, 173, 174 ; distribution of, 
175. 
Ophiolepis squamata, 382. 
Ophiomastus, 173. 
Ophiomitra carduus, 182 ; O. chelys, 161, 
173 ; 0. plicata, 628. 
Ophiomusium cancellatum, 161 ; 0. corti- 
cosum, 738 ; 0. lymani, 804 ; 0. pul- 
chellum, 173, 182. 
Ophiomyces, 174. 
Ophiomyxa, 173. 
Ophiopeza, 173. 
Opliioplinthus, 172. 
Ophiopyren longispinus, 161. 
Ophiotholia, 173, 174 ; 0. supplicans , 804. 
Ophiothrix, 173. 
Ophiotrochus, 172. 
Ophiura, 173. 
Ophiurid, parasitic on Actinomctra, 541. 
Ophiuroidea, account of the, 172. 
Oplithalmis lincea, 581. 
Opuntia, 760. 
Orange season at Tahiti, end of, 784. 
Oranges at Tahiti, 788. 
Orbicula, 893. 
Orbiculina, 186. 
Orbitolites, 485, 487, 835. 
Orbulina, 218, 467, 511, 851, 911, 919 ; 
0. universa, 435, 436, 803, 838, 912 ; 
yellow cells in, 839. 
Orca, 437. 
Orchids, 459, 460, 534. 
Oreaster, 188, 542. 
Organpipe Coral, 664. 
“ Oriental,” the, 368. 
Ornaments, at Admiralty Islands, 709, 
710, 711, 722, 727 ; at Api, 518 ; at 
Arrou Islands, 547 ; at Cape York, 
541 ; at Humboldt Bay, 683. 
Ornithoptera poseidon, 548. 
Oroc, Mount, 632. 
Orofeua, Mount, 786. 
Orotava, 53. 
Orthidse, 893. 
Orthis, 893 ; 0. concinna, 894 ; O. suli- 
vani, 893, 894 ; 0. tenuis, 893. 
Orthoptera, 580. 
1097 
Orthotetes, 894. 
Oscillatoriee, 136, 545, 606, 654, 738, 930. 
Osmcea, 186. 
Osmunda, 143 ; O. cinnamomea, 143 ; O. 
regalis, 143. 
Osnaburgh Point, 532. 
Osorio, Spanish royalist, 825. 
Ossifraga, 325 ; 0. gigantea, 294, 436. 
Ostracoda, account of the, 846 ; British, 
847 ; pelagic, 847. 
Otosaurus microlcpis, 485. 
Ovalau Island, 492, 502, 508. 
Ovulum ovum, 709, 710, 715, 722. 
Owen, Prof., 366. 
Owl, 535, 766. 
Oxycephalus, 171. 
Oxygen, in bottom waters, 995 ; in inter- 
mediate waters, 996. 
Oxypleurodon stimpsoni, 588, 589. 
Oxyrhina, teeth of, 757, 775, 805. 
Oxyrhynclia, 585. 
Oxystomata, 585. 
Oxyuris, 129. 
Oysters, 460. 
Pachychalina, 572. 
Pachygrapsus, 587 ; P. maurus, 587 ; P. 
transversus, 587. 
Pacific Islanders, crania of, 730. 
Pacific Ocean, 428, 449, 450 ; bed of, 771 ; 
density of water in, 961 ; salinity 
of, 961 ; saltest water in, 965 ; winds 
across the, 753. 
Pack ice, 430 ; colour of, 405 ; description 
of, 406 ; nature of ice composing, 405. 
Paddy, 359. 
Page, Mr., 497. 
Pagodroma, 325 ; P. nivca, 436' 
Paguridea, 898, 899. 
Pagurus, 187 ; P. striatus, 900. 
Paloechthus cossonoides, 269 ; P. glabratus, 
269. 
Paloeeudyptes, 364. 
Palcemon, 187, 190, 651 ; P. fueorum, 136; 
P. pclasgicus, 136. 
Palseocrinoids, 311, 313. 
Palaeozoic Crinoids, 313. 
Palinurus, 879; P. frontalis, 830. 
Pallenopsis, 857, 858 ; P. mollissima, 859 ; 
P. patagonica, 858. 
Palm, 459 ; fruits brought up in trawl, 
607, 628 ; of Juan Fernandez, 828; 
Sago, 547, 555, 597 ; Saguir, 598. 
Palma Island, 181 ; deposit west of, 182. 
Palmas Island, 668. 
Palmetto, 943. 
Palmipedes, 366. 
Pamilaean Island, 652. 
Pamphila moseleyi, 555 ; P. pustula, 128. 
Pan Azucar, 902. 
