REPORT ON THE DEEP-SEA DEPOSITS. 
517 
Pigaffetta, M., xv. 
Pillars of Hercules, xvi. 
Pilulina, 263. 
Placopsilina huUa, 105. 
Placostegns bentlialianus, 264, 
„ challengerise, 264. 
„ ornatiis, 264. 
Plagioclase, 20, 217, 226, 231, 243, 296, 297, 300, 
301, 302, 305, 308, 309, 310, 312, 313, 316, 
317, 318, 319, 320, 322, 325, 343, 349, 383. 
Plancus, J., XX, 
Plankton, 251. 
,, abyssal, 251. 
,, bathybial, 251. 
„ neritic, 251, 281. 
,, oceanic, 251, 281. 
„ pelagic, 251, 257, 259, 266, 280. 
,, zonary, 251. 
Planktonic, 252. 
Plants, 95, 97, 99, 101, 103, 107, 111, 159, 172. 
Plata, Rio de la (see Rio de la Plata). 
Plateau surrounding Tristan da Cunha group, 157. 
Plato, xvi. 
Pleurocorallium johnsoni, 342, 465. 
Plombieres, 401, 402, 407, 410. 
Plutarch, xiv. 
Plutonic rocks, 314. 
“ Plutonic tallies,” xxv. 
Poggendorf, J. C., xiv. 
Pol4jaeff, N., 264. 
Poliopogon amadou, 41, 284, 285, 342. 
„ gigas, 166, 284. 
Polybius, xiii, xvi. 
Polyps, XX, 343. 
Polystomella, 36, 40, 48, 154. 
Pohystomidium patens, 181. 
Polytrema, 38, 59, 95, 97, 98, 153, 156. 
„ miniaceum, 59. 
,, rubra, 144. 
Polyzoa, 14, 31, 34-146, 161, 193, 194, 215, 216, 
225, 244, 265, 289, 354. 
“ Porcupine,” the, xxvii, 9, 30, 284. 
Porphyries, 407. 
Porphyritic rocks, 326. 
Porpoise, earbones of, 272. 
Port Jackson, deposits in, 82-83. 
Portugal, 382. 
Posidonius, xiii. 
Possession Bay, xv, 334. 
Post-Tertiary volcanic rocks, 314. 
Potash, determination of, 28. 
Potassium, 418. 
Pouchet, G., 255. 
PourtaRs, L. F. de, xxiv, xxvii, 382. 
JPrecipitations, atmospheric, 334, 335. 
Preface, ix. 
Pre-Tertiary rocks, 314. 
Primary formations, glauconite in, 384. 
Prince Edward Island, deposits off, 161 (see Marion 
Island). 
Protoxide of iron, determination of, 28. 
PsammospliBera, 263. 
Psilomelane, 369, 371. 
Pteropoda, 31, 36-146, 215, 216, 223, 224, 225, 240, 
244, 258, 262, 266-267, 289, 365. 
Pteropod Ooze, xxix, 186, 189, 223-228. 
,, analyses of, 226-227, 447-448. 
„ area of, 227-228, 248. 
,, average composition of, 226. 
„ average depth of, 225, 248. 
„ distribution of, 227-228. 
„ fine washings in, 226. 
,, mineral particles in, 226. 
,, rate of deposition of, 411, 412. 
„ siliceous organisms in, 226. 
Ptolemy, xiii. 
Piichler, xiv. 
Pullenia, 50, 132, 165, 167, 172, 176, 192, 260. 
,, obliquiloeulata, 120, 180, 214. 
„ quinqueloba, 120, 132. 
Pulvinidina, 34-146, 165, 167, 171, 172, 176, 182, 192, 
216, 225, 260, 267, 289. 
,, canariensis, 130, 180, 214. 
,, crassa, 214. 
„ favus, 93, 104, 105, 106. 
,, menardii, 53, 59, 61, 63, 65, 67, 73, 96, 
100, 104, no, 127, 155, 168, 180, 
214. 
,, mielieliniana, 132, 163, 164, 180, 214. 
,, tumida, 120, 122, 155, 180, 214. 
Pumice, 32, 37-145, 194, 196, 217, 218, 226, 238, 
243, 292, 293, 294-298, 299, 308, 310, 
313, 314, 316, 318, 340, 342, 343, 344, 
347, 348, 349, 350, 351, 352, 353, 354, 
355, 357, 359, 361, 364, 367, 369. 
,, alteration of, 296. 
„ analyses of, 296, 297, 453, 454, 455, 457. 
„ andesitic, 296. 
,, „ analysis of, 296. 
,, basaltic or basic, 295, 298-297, 347, 348, 
349, 355. 
,, ,, analysis of, 297. 
