424 



INDEX. 



Sagitta Mariana, diflflculties of classify- 

 ing the, 265 — description of it, ib. — 

 its want of a vascular system, 267. 



St Helier's, town of, 286, 288. 



St Mary's Isle, one of the Scillies, 195, 

 199— Sound, 197. 



Salpa, peculiarities of generation in 

 the, 303. 



Sars, discoveries of, in Parthenoge- 

 nesis, 304. 



Sarsia prolifera, reproduction in the, 

 183. 



Saxicava rugosa, the, 87. 



Scepticism, importance of, in Biologj', 

 105 — necessity of, in scientific obser- 

 vation, 162. 



Schmarda on chyle-corpuscles in the 

 Actiniae, 274. 



Science, delights of, 45. 



Scilly Isles, selection of, for sea-side 

 studies, 191 — voyage and landing at, 

 195 et seq. — first sight of, 197 — de- 

 scription of them, 199 — origin of 

 their name, 203 — historical notices 

 of them, 204 — the population, 205 — 

 geological conformation of the, 240 

 — their climate, 242 — departure from 

 the, 283. 



Sea, attractions of the, 4 — aspect of 

 the, its shore, &c. at Ilfracombe, 9 

 — sources of its interest, 28 — passion 

 for it, 98 — passion of Englishmen for 

 it, 209 — the poets on it, 285 — source 

 of it phosphorescence, 345. 



Sea Anemones, the digestion of the, 219, 

 226 et seq. See Anemones. 



Sea-hare, the, 23— superstitions regard- 

 ing it, ib. — the shell rudiment in 

 it, 261 — at Jersey, 291. See also 

 Aplysia. 



Sea-mouse or Aphrodita, blood of the, 

 70. 



Sea-scene, a, at Ilfracombe, 27. 



Sea-sickness, 95, 97, 197. 



Sea-slugs, see Eolids. 



Sea-urchin, the, 254. 



Seeing, see Vision. 



Segond on nerve-fibre, 396 note. 



Sennebier, discovery of the decompo- 

 sition of carbonic acid by plants by, 

 246. 



Sensations without visible nerves, on, 

 871. 



Sensibility, that to pain a specialisa- 

 tion of, 351 — existence of, apart from 

 nervous system, 389 — manifested 

 without nerves, 404 — definition of, 

 and whence derived, 406 — speciali- 

 sation of, ib. et seq. — does not neces- 

 sarily imply senses, 409. 



Serpulae, the, 69 — abundance of, 13. 



Sertularian Polypes, reproduction in 

 the, 3.30. 



Seven Tors, the, Ilfracombe, 8. 



Sex, determination of, in the Ane- 

 mones, 172. 



SheUed and naked Molluscs, the, 261. 



Shells of Molluscs, the, 261, 375. 



Shovel, Sir Cloudesley, scene of the 

 shipwreck of, 233. 



Siebold, see Von Siebold. 



Silk-worm, peculiarities of generation 

 in the, 308. 



Skin, universal sensibility of the, 

 371. 



Sleep, influence of, on respiration, 248. 



Slug, insensibility of the, to pain, 349. 



Smooth Anemone, the, 13 — where 

 found, 17. 



Snails, vitality of various, 358. 



Society at the sea-side, on, 30. 



Solen, irritability of the, after death, 

 349 — how to catch the, 380 — salting 

 their tails, 383 — the nervous system 

 of the, 392, 393. 



Solitary Ascidians, the, at Jersey, 291. 



Solubilit}% necessary to assimilation, 

 223. 



Solvent fluid, the supposed, in the Ac- 

 tiniae, 227. 



Sperm-cells, assumed necessity of, to 

 groAvth. 327 — and germ-cells, repro- 

 duction by union of, 334. 



Spermatozoa, present with ova in the 

 Anemones, 173 et seq. 



Spix, researches of, on the Anemones, 

 125. 



Sponges, the circulation of the, 269. 



Star Castle, Scilly Isles, 198, 204. 



Starfish, a suicidal, 258 — the Pedicel- 

 laria of the, 387. 



Steenstrup on Parthenogenesis, 298, 

 305, 339— his theory of it, 317. 



Stilling on the nervous system, 388 

 7wte — on the nerve-sheath, 402 note. 



Stinging power of the Anemones, the 

 alleged, 135. 



Summer, delights of, 341. 



Sunlight, influence of, on plants, 246. 



Swammerdamm on the blood of the 

 Annelids, 70 — on the Hermit crab, 

 2.5S. 



Syllis, gemmation of the, 64 — Parthe- 

 nogenesis among, 308. 



Syngnathus anguineus, the, 215 — pe- 

 culiarities of the, 250 — the ner\'ous 

 system of the, 394. 



Tadpole, a MoUuscan, 296. 



Teale, Mr, the ovaries of the Actiniae 

 described by, 170 note, 171. 



Temperature, influence of, on genera- 

 tion, 333 — vision dependent on, 365 

 et seq. 



Ten Thousand, the, and the Sea, 209. 



Tenby, compared with Ilfracombe, 5 

 — sands, 75. 



Tentacles of Annelids, &c., "Williams 

 on the, 72. 



Terebella, the, 26 — vitality of its sepa- 

 rated tentacles, 59 — gemmation of 

 it, 64 — no muscular tissue in it, 7-5. 



Terebella nebulosa, the, 63, 64. 



Teredo navalis, the, 86 et seq. 



