INDEX. 



411 



it, 61, 62 — no muscular tissue in it, 



72. 

 Terobolla ncbulosa, the, 60. 

 Teredo navalis, the, 82, 83. 

 Thread capsules, are they organs of 



urticatioii, 146 ct seq. 

 Todd, Dr, on interrupted continuity of 



nerve-fibre and its effects, 377. 

 Trawling, description of, 277. 

 Trembley on the fresh-water Polypes, 



137— experiment on the Hydra by, 



218 note — on the reproduction of 



the Polype, 282. 

 Tresco, climate of, 229. 

 Triton, irritability of the, after death, 



333 — its nervous system, 375. 

 Troo-lodytes, haunts of the, 16 — not 



migratory, 125. 

 Tubicolae, gemmation among the, 62. 

 Tubularia parasitica, 336. 

 Tyi^ical forms, interest of, 34. 



Unzer on the insensibility of the lower 



animals to jiain, 332. 

 Urticating cells, the alleged, in the 



Polypes, 146 et seq. 



Valleys, want of, at llfracombe, .5. 



Van Beneden, name given to Parthe- 

 nogenesis by, 281 — his views on it, 

 288. 



Vegetable and Animal life, the mode of 

 distinguishing between, 120 et seq. 

 See Plants. 



Venus flytrap, see Dionsea Muscipula. 



Vision, the process of, 343 et seq. 



Vitality, peculiarities of, 56. 



Vivisection, defence of, 329. 



Von Baer, his law of animal develop- 

 ment, 158. 



Von Sieliold on the Eolis, 1 10 — on the 

 Annelids, 111 — on the paralysing 



power of the Hydra, 135 — classifica- 

 tion of the Sagitta bj', 250 — views of, 

 on Parthenogenesis, 288 — on Parthe- 

 nogenesis, 303, 304 — on the eye of 

 Invertebrates, 351 — on the colour of 

 tlio ganglia of the Doris, &c., 371. 

 Vorticolkc, the parasitic, 53. 



Wagner on the sex of tho Actiniie, 

 163. 



Walker, Alex., his hypothesis on tho 

 nei-vous system, 379. 



Water, entrance of, into the blood, 111. 



Water-newt or Triton, see Triton. 



Wlielk, the, and the Hermit crab, 50. 



Wild-flowers, varieties of, in Scilly, 189. 



Will, ready ascription of, by zoologists, 

 to the lower animals, 95. 



Williams, Dr T., on the Annelids, 64 — 

 his views on the cliylaqueous fluid, 

 68 — on the tentacles of tlie Annelids, 

 69 et «f(2. — definition of a nutritive 

 fluid by, 254 — on that of the Ane- 

 mone, 256, 258. 



Wolfit" on the flower and fruit, 306, 309 

 — views of, on the sperm-cell, 318. 



Wolhiston, Mr, on the vitality of Mol- 

 luscs, 340. 



Worms, see Annelids. 



Wright, Dr Strethill, on the Actinia 

 dianthus, 168 — the Actinia omata 

 described by, 276. 



Yeast, reproduction in, 314. 



Zoologists, inattention to logic among, 



96, 99— increasing enthusiasm of the, 



178. 

 Zoology, necessity of scepticism in, 153 



—danger of a priori conclusions in, 



36f{ et seq. 

 Zoophytes, partiality of, for darkness, 2 1 . 



