159G 
THE VOYAGE OF H.M.S. CHALLENGEK. 
Occidental basin, 72. 
Ocean, The, 51. 
„ basins, condition of, in early geological ages, 
1462. 
„ „ „ in Palaeozoic times, 1439. 
„ „ „ in Pre-Cambriau times, 
1457. 
„ „ „ in Silurian times accord- 
ing to Wy ville Thom- 
son, 1439. 
,, „ permanence of, 1462. 
„ river, 8, 9. 
Oceania, 44, 47, 
Oceanic theory of distribution. of land and water, 28. 
Oceanographical knowledge of the ancients, 2. 
„ „ Egyptians, 3. 
„ „ Greeks, 7. 
„ „ Hebrews, 2. 
„ „ Hindus, 3. 
„ „ Jews, 2. 
„ „ Phoenicians, 3. 
„ views during the Dark Ages, 29. 
„ „ Middle Ages, 29. 
„ „ Renaissance, 29. 
Oceanography, 1. 
Oceanus Aethiopicus, 49. 
„ Atlanticus, 49. 
„ Au.Htralis, 50. 
„ Hyperboraeus, 50. 
„ Occidentalis, 49. 
< >ctant, 54. 
Octopoda, 54.5, 681. 
Odometers, 58. 
Odyssey, 8, 18. 
Oersted, A. S., 82. 
Ohthere, 31, 47. 
Oldham, H. Y., 40. 
Oolitic calcareous rocks, 99. 
„ rocks, 100. 
Ooze, 100. 
,, calcareous, 100. 
Ophidiidn*, 915, 1050. 
< >phir, 5, 38. 
Ophiuroidea, 110, 114, 135, 141, 162, 169, 172, 193, 
202, 211, 213, 217,220, 224, 229, 2.34,237, 
241, 248, 259, 266, 270, 279, 282, 291, 293, 
296, .307, .3.32, .339, 34.3, 352, .357, .374, 379, 
386, .393,408, 417, 419, 426, 434, 445,452, 
4.5H, 462, 484, 488, 494, 497, 50.3, .507, 519, 
527, 5.31, 5.37, 548, 556, 577, 585, 591, 593, 
Ophiuroidea — continued. 
596, 600, 601, 607, 613, 619, 623, 632, 637, 
646, 663, 665, 668, 681, 694, 716, 720, 738, 
746, 752, 754, 757, 758, 762, 769, 772, 780, 
785, 788, 792, 801, 805, 810, 811, 814, 819, 
827, 840, 8i42, 843, 847, 855, 864, 875, 894, 
898, 906, 912, 918, 921, 923, 934, 947, 962, 
964, 995, 1050, 1066, 1088, 1110, 1117, 1123, 
1140, 1142, 1148, 1151, 1155, 1157,1160,1162, 
1164, 1166, 1169, 1173, 1175, 1182,1189,1198, 
1205, 1216, 1239, 1242, 1246, 1278,1285,1293, 
1304, 1317, 1334, 1446, 1448, 1450. 
„ larvae of (see Larvae). 
Opinions as to why the sea is salt, 65. 
Oracle of Delphi, 9. 
Oran, 77. 
Oregon, 47. 
Organisms, Arctic and Antarctic compared, 1439. 
„ attached to Mediterranean cable, 96. 
„ (deep-sea), difficulty of determining where 
captured by trawl and dredge, 1275. 
„ from deposits (see under each Station). 
,, „ surface (see under each Station). 
„ inhabiting the intermediate waters of the 
ocean, 1455. 
Ortelius, A., 41, 49, 53. 
Oscillarise, 1455. 
Oscillatoriaceae, 150, 153, 156, 160, 187, 188, 334, 
642, 676, 735, 737, 741, 774, 775, 783, 790, 
793, 797, 799, 802, 845, 853, 858, 877, 884, 
885, 886, 889, 893, 971, 987, 991, 994, 1007, 
1018, 1202, 1207, 1210, 1245, 1248, 1251, 
1256, 1262, 1266, 1455. 
Ostracoda, 132, 144, 173, 193, 253, 259, 266, 271, 
279, 282, 293, 308, 314, 350, 358, 394, 409, 
420, 436, 446, 466, 479, 484, 489, 509, 522, 
524, 528, 531, 535, 538, 552, 558, 578, 594, 
596, 602, 603, 624, 638, 675, 682, 696, 722, 
742, 763, 794, 834, 852, 855, 859, 875, 905, 
913, 947, 951, 962, 996, 1066, 1071, 1078, 
1093, nil, 1129, 1135, 1137, 1138, 1141, 
1142, 1152, 1161, 1169, 1176, 1182, 1185, 
1194, 1199, 1207, 1213, 1219, 1224, 1235, 
1240, 1242, 1246, 1255, 1270, 1271, 1279, 
1286, 1295, 1306, 1319, 1338, 1443, 1447, 
1448, 1451. 
Otaheite, 69. 
Otoliths of fishes, 138. 
Otter trawl, 676. 
Outer Ocean, 7. 
