INDEX. 
Plagusia, i. 175. 
range of vision of, i. 177. 
Plants, absent in deep water, i. 107. 
Platt, R., i. xii. 
Platydia anomioides, ii. 77. 
Plectromus suborbitalis, ii. 28. 
Pleurocarpa ramosa, ii. 187. 
Pleuropus, i. 187. 
Pleurotoma (Ancistrosyrinx) elegans, ii. 66. 
Pleurotoma Blakeana, ii. 66. 
Pleurotoma curta, ii. 66. 
Pleurotoma limacina, ii. 66. 
Pleurotoma subgrundifera, ii. 66. 
Pleurotomaria Adansoniana, ii. 69. 
Pleurotomaria, bathymetrical range of, i. 
169. 
Pleurotomaria Quoyana, ii. 69. 
Pleurotomidæ, ii. 66. 
Pliobothrus symmetricus, ii. 188, 189. 
Plumularidæ, ii. 135. 
Pneumodermon, i. 121. 
Podocidaris sculpta, ii. 92. 
Pollicipes, ii. 51. 
Polycistinæ, i. 195. 
Polyclonia, i. 177. 
lives on the bottom, i. 185, 
Polymorphina ovata, ii. 166. 
Polyps, ii. 142. 
Polystomella erispa, ii. 109. 
Polystomellx, i. 271. 
Polytrema miniaceum, ii. 109. 
Pomalostegus stellatus, ii. 57. 
** Porcupine,” i. 245. 
eruise of the, i. 40. 
deep-sea temperatures by, i. 46. 
expedition of the, i. 43, 
Porina subsulcata, ii. 82, 
Porites clavaria, i. 82. 
Porites embryo, i. 74. 
Porites furcata, i. 82. 
Porocidaris, i. 158. 
Porocidaris Sharreri, ii. 90, 91. 
Poromya, ii. 73. 
Porpita, i. 121, 180. 
Porpitidw, affinities of, i. 184. 
Port de France, i. xvi. 
Porto Rico, land shells of, i. 115. 
Pourtalès, L. F., i. vii, 3. 
exploration of, in ** Bibb,” i. 45, 
exploration of, in “ Corwin,” i. 45. 
on affinity of deep-sea corals and tertiary 
fossils, ii. 17. 
on boundary of siliceous sand, i. 279. 
on characteristic foraminifera, i. 271. 
on corals of the “Blake,” ii. 148, 
on corals of West Indies, ii. 18. 
213 
Pourtalds, L. F., on deep-sea corals and ter- 
tiary types, ii. 19. 
on penetration of light, i. 305. 
Report on Corals, i. xxi. 
| Pourtalés Deep, i. 106. 
Pourtalés Plateau, i. 62, 284, 286. 
fauna of, i. 91. 
Pourtalesia miranda, ii. 101. 
Pourtalesix, i. 159. 
affinities of, ii. 101. 
forerunners of spatangoids, ii. 07. 
Praya, ii. 135. 
Pre-archwan continent, i. 127. 
Preservation of animals in bottom deposits, 
i. 170. 
Pressure, adaptation of marine animals to, 
i. 904. 
range of, for marine animals, i. 801. 
Primnoa Pourtalesii, ii. 146. 
Primordial ocean, fauna of, i. 153. 
Mallet on, i. 158. 
Protoplasm, i. 149. 
Protozoans without solid tests, ii. 157. 
Pseudodiadematida, i. 159. 
Psolus tubereulosus, ii. 85. 
Psychropotes longicauda, ii. 86. 
Pterophryne, nest of, ii. 31. 
Pterophysa grandis, i. 184. 
Pteropod and globigerina ooze, i. 264. 
Pteropod ooze, depth at which it appears, i. 
50, 147. 
depth at which found, i. 265, 
in Straits of Florida, i. 283. 
Pteropod shells, in globigerina ooze, i. 
283. 
decay and solution of, i. 288. 
Murray on solution of, i. 283. 
Pteropod sili in Windward Passage, i. 
235. 
Pteropods, i. 190. 
Pterotrachea, i. 191. 
Ptychogena lactea, ii. 128. 
Pulvinulina auricula, ii. 169. 
Pulvinulina Menardii, ii. 169. 
Pumice, decomposition of, i. 267, 
floated out to sea, i. 267. 
taken by tow-net, i. 267. 
Pycnogonidæ, eyes of, ii. 39. 
Report on, by E. B. Wilson, i. xxi. 
Pyenogonids, ii. 49. 
Pylocheles Agassizii, ii. 40. 
Pyrosoma, i. 187. 
Pyrosomee, i. 198. 
Quoy and Gaimard on limit of reef-building 
corals, i. 74, 
