INDEX. 
003 
Pina radis and P. nigrina, 369. 
Pinnoctopns corollilbrmis, 466. 
Pintadine pearls, 353. 
Pipe-fish (Syngnathus), 526. 
Pipe-fishes (Fistularia), 595. 
Plaice (Platessa vulgaris), 54 L. 
Planorbis corneus, 405. 
Plenronectid®, 538. 
Plumatella 'cristallina, 308. 
Polar seas, 47. Expeditions to, 47. 
Polype and branch, 133. 
Polypidum, 146. 
Polypier and Polypi defined, 107. 
Polypifera, 107. 
Polypiferous crust in Gorgons, 151. 
Pomotouan Archipelago, 171. 
Porcelain shells, 418. 
Porites, 164. 
astro'ides, 149. 
furcata, 165. 
Porpila pacifica, 235. 
Porpitse, 234. 
Portion of the disk of Physophora hydro- 
statics, 238. 
Portumnus variegatus, 482. 
Poulpe : Marvellous stories of the ancients 
concerning, 457. Mandibles preserved 
in the College of Surgeons, 458. 
Praya diphys, 245. 
Primitive generation, 98. 
Principal forms of Anodonta, 370. 
Principal species of Sea-anemones, 189. 
Propagation of Infusoria, 96. 
— of Sea-urchins, 292. 
Protozoa, 74. Leuwnlioek’s discoveries, 
74. 
Pteroceras, their origin, 436. 
cldragra and P. lam his, 437. 
scorpio, and P. millepeda, 436. 
Pteropoda, 441. The organization, wings, 
or flappers, 441. 
Pulmonary Gasteropods, 393, 404. 
Pupa uva, 401. 
Pure water, 17. 
Purpura, its reputation with the ancients, 
427. 
consul, 428. 
Purpura lapillus and patula, 428. 
Pyrosoma, 314. 
Raiadse, 501. 
Rarefaction in Polar seas, 62. 
Rataria, 234. 
Ravages of the Teredo, 385. 
Ray-fish, 504. 
Recuperative powers of Holothuria, 295. 
Red Sea Corals, 177. 
Reflux of tides, 41. 
Reign of law, 64. 
Rhizopods, 75. 
Rhizostoma Aldrovandi, 223. 
Cnvieri, 222. 
Rook covered with young Coral Polypes, 
137. 
Roman indifference to life, 534. 
Rose aurelia, 227. 
Ross’s (Sir James) discoveries, 60, 51, 58. 
Rotation of the earth, 40. 
Rotella Zealandiea, 412. 
Rudimentary forms of life, 64. 
Rugous madrepores, 150. 
Sagartia vidua ta, 191. 
SalmonidtB, 553. 
Salmon leaps, 557. Falls of Kilmoraek, 
657. Anecdote of Lord Lovat, 558. 
Salpa maxima, 316. 
Saltness of tlie sea, 18. Its source, 25. 
Salt water at the Poles, 21. At the 
Equator, 21. 
Salt-water lakes, 18. 
Sarcoda, 92. 
Sargasso Sea, 35. 
Saw-fish, 514. 
Scallop shell, 346. 
Scomheroides, 584. 
Scoroshy’s account of the Polar seas, 60. 
Scottish pearls, 372. 
Scylla and Chary bdis, 46. 
Sea Anemone, 184. Organization, 185. 
Toxological properties, 188. 
Sea Cucumber, 293. 
Sea Eel (Murajna Helena), 533. 
Sea Eggs, 293. 
