INDEX. 
Pacific Ocean, axis of area of subsidence, 
398, 432. 
relation of subsidence of, to 
changes over the continents, 
429, 
Pachydomus antiquatus, 693. 
carinatus, 696. 
cuneatus, 693. 
gigas, 697, 
levis, 694. 
sacculus, 700. 
Pahoihoi, 162, 165. 
Palmyra Island, 405. 
Pampas of Rio Negro, 607. 
Pango-pango, harbour of, 310, 311. 
Patagonia, Rio Negro, in Northern, 607. 
tertiary of, C. Darwin, 609, 
Paumotu Islands, 14, 24, 58, 71, 137. 
changes of level in, 394, 401,402. 
Peabody, J., analysis of Pele’s hair, 199. 
Peale, T. R., cavern in Upolu, 328. 
Pebbles cemented by lime, 44, 329. 
Pecten comptus, 704. 
illawarrensis, 705. 
leniusculus, 704, 
mitis, 705. 
propatulus, 726, 
squamuliferus, 705, 
tenuicollis, 705. 
Pectunculus nitens, 726. 
patulus, 726, 
Pele’s hair, 179, 199. 
analysis of, 199, 200. 
Pelews, 410. 
Pentadia corona, 712. 
It is possible that the plates referred on page 712 to 
Pentadia, may pertain to M’Coy’s genus Tribrachyocrinus. 
See Ann. and Mag. Nat. Hist. xx. 228, pl. xii., fig. 2, 1847. 
Percival, J. G., character of dikes illustrated 
in a work by, 416, 
Perry, O. H., soundings near Upolu, 99. 
Peru, observations on the vicinity of Callao, 
587. 
Pescadores, 54. 
Petrified wood, in Oregon and California, 
658, 669. 
in N. 8. Wales, 483, 491, 714. 
188 
749 
Petrified wood, in Chili, 584. 
on Luzon, 542, 
Philippine Islands, geological observations 
on, 539. 
Pholadomya audax, 687. 
curvata, 688. 
glendonensis, 687. 
undata, 687. 
Phyllotheca australis, 718. 
Pickering, C., observations on Kilauea, 181, 
182, 
pit craters of Mount Loa, 212. 
observations on Mount Kea, 214. 
tubular concretions of Maui, 231. 
observations at salt lake of Oahu, 248. 
Pico Ruivo, height of, 550. 
Pipestone of Northwest America, 636, 
Pitchstone in Oregon, 644. 
Plants of coral islands, 78. 
fossil, of Australia, 482, 491, 714. 
of Oregon, 729. 
Pleurorhynchus australis, 701. 
Polynesia, limits of, 11. 
Polynesian words, pronunciation of, 734, 
Porphyritic rocks of Chili, 579. 
basalt, 267, 294, 310, 315, 345, 498. 
Porphyry of the Sacramento Bute, 650. 
conglomerate, Chili, 583, 
in Peru, 599. 
Potatoes growing over recent lava fields, 
166. 
Powell, soundings by, 56, 
Prairies, upper and lower, of Oregon, 619. 
Prase and prasoid rock, in Northern Cali- 
fornia, 682. 
Precipices of Upolu, 312, 325, 332. 
of Oahu, 235, 258. 
of Tahiti, 285, 287, 291. 
of Madeira, 549. 
Prevost, C., views on volcanic action, 372. 
Productus brachytheerus, 686. 
fragilis, 686. 
Protogine in Northern California, 634, 
Puddingstone of the Shasty Mountains, 639. 
of New South Wales, 461. 
consisting of coral and basaltic 
pebbles, 329. 
