XX LIST OF ILLUSTRATIONS. 



PAGE 



169. Transverse Section of Hazel, . . . . -380 



170. Ditto of Fossil Conifer, .... 



171. Vertical section of Fossil Conifer, radial, .... 382 



172. Ditto Ditto, tangential, 



173. Ditto of Mahogany, ... . 382 



174. Transverse Section of Fossil- wood, ..... 



175. Vertical Section of Ditto, 



176. Transverse Section of Fossil-wood, ..... 



177. Vertical Section Ditto, . . . . .383 



178. Transverse Section of Aristolochia, (t) .... 385 



179. Ditto of Burdock, . . . . .385 



180. Cuticle of Yucca, ....... 



181. Ditto of Indian Corn, . ..'.<. . . . 388 



182. Ditto of Apple, after Brongniart, . .... 389 



183. Ditto ofEochea, " . . . . . .390 



184. Vertical Section of leaf of Eochea, after Brongniart, . . 390 



185. Cuticle of Iris, Ditto, .... 392 



186. Vertical Section of leaf of Iris, Ditto, . 393 



187. Longitudinal Section of ditto, Ditto, .... 393 



188. Cuticle of Petal of Geranium, . . . . . 395 



189. Pollen-grains of Althcea, &c., . . . . . .398 



190. Seeds of Poppy, &c., . M . . 402 



191. Amceba princeps, after Ehrenberg, ..... 405 



192. Actinophrys sol, after Clarapede, ..... 407 



193. Various forms of RMzopods, after Ehrenberg, . . . .411 



194. Kerona silums, after Milne-Edwards, . . . . 414 



195. Paramecium caudatum, Ditto, . . . . .414 



196. Group of Vorticella, after Ehrenberg, . . . . 416 



197. Fissiparous Multiplication of Chilodon, after Ehrenberg, . .418 



198. Metamorphoses of Vorticella, after Stein, . . . . 419 



199. Ditto of Trichoda, after Haime, * ... 420 



200. Brachionus pala, after Milne-Edwards, .... 427 



201. Rotifer vulgaris, after Ehrenberg, . . . .429 



202. Stephanoceros Eichornii, Ditto, ..... 432 



203. Noteus quadricornis, Ditto, . ..''.:> . . . 434 



204. Gromia oviformis, after Schulze, . . . . . 437 



205. Rosalina ornata, after Schulze, . . . . . 439 



206. Orbitolites complanatus, . . .< . . . 441 



207. Animal of simple type of ditto, . -V, .... 442 



208. Animal of complex type of ditto, . '" ' \ '< *^ 1 ' . . 444 



209. Section of JFaujasina, after Williamson, .; : . . . . 447 



210. Podocyrtis Schomburgkii, after Ehrenberg, . . . 450 



211. Rhopalocanium ornatum, Ditto, . . . . .450 



212. Haliomma Humboldtii, Ditto, . . . . . 450 



213. Perichlamydium prcetextum, Ditto, ," . . . . 450 



214. Polycystina from Barbadoes, Ditto, . . . . . 451 



215. Stylodictya gracilis, Ditto, . . . . .452 



216. Astromma Aristotelis, Ditto, . ... . . 452 



217. Structure of Grantia, after Dobie, "V. ..> . . . 453 



218. Portion of Halichondria, .. . . . . . 454 



219. Siliceous spicules of Pachymatisma, . ..vs . . . 454 



220. Hydra fusca, after Milne-Edwards, ; . ; * ^- 3 ' . . 45^ 



221. Ditto in gemmation, after Trembley, .. .' <> . . 460 



222. Medusa-buds of Syncoryna, after Sars, . . ';" . . 460 



223. Campanularia gelatinosa, after Van Beneden, .... 464 



224. Sertularia cupressina, after Johnston, .... 466 



225. Thaumantias pilosella, after E. Forbes, , 3 . . . 467 



226. Development of Medusa-buds, after Dalyell. .v . . 468 



227. Development of Mediisce, Ditto, . -4 ' . . . 4^9 



228. Ci/dippe and Beroe, after Milne-Edwards, I 'fo . . 470 



229. Noctihica miluiriv, after Quatrefages, . ;'-U t -.-' . .571 



