438 
Pelews, 280, 307, 381. 
Pennatulacea, 91. 
Penrhyn’s Island, 375. 
Peritheca, 60, 97. 
Persian Gulf, reefs in, 350. 
Pescadores, 170, 380. 
Phillippine Islands, 348. 
Phoenix Group, depths near, 173, 179. 
on islands of, 195, 376. 
Phyllastraea tubifex, 56, Plate I. 
Phymactis clematis, 22, Plate II. 
florida, 22. 
veratra, 22, Plate II. 
Pitcairn’s Island, 340. 
Plants of Paumotus, list of, 326. 
Plexaura crassa, 114. 
flexuosa, 114. 
homomalla, 114. 
Plexaurella, 87. 
Pliobothrus, 105. 
Plumularia faleata, 102. 
Pocillipora, 70. 
Pocillipora grandis, 71. 
elongata, cell of, 71. 
plicata, cell of, 71. 
Polyps, classification of, 20, 61, 80. 
Ponape, 342 
Porites family, Poritide, 75. 
size of some, 146. 
astreoides, 113, 114, 418. 
clavaria, 113, 114, 418. 
levis, 75, 79. 
mordax, 53, 78. 
solida, 113. 
Port Natal, 351. 
Pourtalés, L. F. de, on Thecocyathus, 43. 
on Haplophyllia, 80. 
rate of growth of corals, 124. 
bottom outside of Florida reefs, 142, 
207, 210. 
depth of reef corals, 116. 
on Florida region, 204. 
Pourtalés Plateau, 211. 
Pouynipete, 342. 
Powell, Lieut., on the Maldives, 186. 
Pterogorgia Americana, 114. 
acerosa, 114. 
Pumice on coral islands, 226, 317. 
Pylstaarts, 341, 374. 
INDEX. 
QUATERNARY changes of level in West 
Indies, 304. 
Quelpaert’s Island, 347. 
Quoy and Gaymard, depth of reef corals, 
115. 
Ascension Island, 351. 
RAIVAVAT, 373. 
Rapa, 340. 
Raraka, 169, 171, 201, 301. 
Rarotonga, 373. 
Red Earth at Bermudas, 225. 
at Tongatabu, 317. 
Red Sea corals, 111, 350. 
Reefs, formation of, 227. 
causes modifying forms of, 242. 
rate of growth of, 253. 
windward side of highest, 240. 
Rein, on Bermudas, 218. 
Renillide, 93. 
Revillagigedo Islands, 339. 
Rice, Wm. N., on the Bermudas, 218, 
221, 224; 295. 
Aimetara, 373. 
Ringgold, Captain, on Penrhyn’s and 
other islands, 376. 
Rivers, effects of, 245. 
Rocks, see Coral. 
Rose Island, 328. 
Rota, elevation of, 381. 
Rotuma, 342, 378. 
Rugosa, 78. 
Rurutu, 340. 
an elevated island, 372. 
SAGARTIA parasitica, 36. 
St. Augustine shell rock, 397. 
Sala-y-Gomez, 340. 
Salomon Islands, see Solomon Islands. 
Salt Key Bank, 210, 211. 
Samoa, see Navigator Group. 
Sandwich Islands, see Hawaiian. 
San Salvador, 216. 
Savage Island, 374. 
| Savali, 862. 
Sawkins, elevated reef of Jamaica, 275. 
Saya-de-Malha, 271. 
Schomburgh, R. H., drift sands of Ane- 
gada, 185. 

