LIST OF ILLUSTRATIONS, 



Figr. 

 153- 



154- 



155. 



156. 



158. 



159. 



161. 



162, 



163. 



164. 



165. 

 166. 

 167. 



168. 



169. 

 170. 



171. 



172. 



^73- 

 174. 

 175- 

 176. 

 177. 

 178. 

 179. 

 180. 



183. 

 184. 



185. 



187. 



192. 

 193' 

 194. 



Pagfe 

 A Dissection of Peripatus 

 Capensis from the Dorsal 

 Surface . . . . . . . . 232 



A Common Garden Spider . . 233 

 The Two First Pairs of Appen- 

 dages of Epeira Diademata . . 234 

 Longitudinal Sagittal Section 



through Epeira Diademata . . 235 

 Foot or Parapodium of a 

 Nereis.. .. . .. 238 



The Life- History of Cirripedia 242 

 Lateral View of Lepas 

 (Barnacle) . . . . .. 243 



Lateral View of Lepas Anati- 

 fera . . . . . . . . 243 



A Zoea Larva of a Decapod . . 244 

 Scolopendra Cingulata (the 



Centipede ■ . . • 245 



Julus Terrestris (a Millipede) 245 

 The Life-History of the Com- 

 mon Cockchafer . . . . 247 



Colorado Beetles . . . . 247 



A Water-beetle 248 



The Hive Bee 249 



The Gall-fly 249 



Tsetse Fly . . . . . . 250 



Syrphus Pyrastri . . . . 250 



Wheat Midge .. .. -.251 



The Daddy-Long-legs or Crane- 



Fly '. 252 



The Horse-Bdt . . . . . . 252 



The Cabbage White . . • • 253 



Demoiselle Dragon-Fly ... 254 



Larva of Dragon-Fly .. .. 255 



The May- Fly .. .. .. 255 



The Grasshopper . . . . 256 



A Group of Hemiptera . . 256 



The Common Louse . . . . 257 



The Rose Aphis . . . . 257 



Mite causing Mange in the 



_Pig 259 



The Harvestman . . . . 260 



Lateral View of the Roman 

 vSnail . . . . . . . , 262 



First Dissection of Snail . . 264 

 Diagrammatic Median Sagittal 

 Section through the head of 

 a Snail . . . . . , . . 265 



Second Dissection of Snail . . 266 

 The Nervous System of the 

 Snail .. .. ., ,. 267 



Lateral View (Left) of Ano- 

 donta in Natural Position and 

 Feeding . . . . . . , . 270 



Internal View of Right Shell 

 of Anodonta . . . . 271 



View of Anodonta with Left 



Mantle-Flap thrown back 272 



Dissection of Anodonta from 

 Left Side . . . . , . 273 



Dorsal View of Heart and 



Pericardium of Anodonta . . 274 

 Dorsal View of the Common 

 Cuttle . . . . . . . . 276 



Fig. 



195- 

 196. 



197. 



198. 

 199. 



200. 

 201. 



205. 

 206. 



208. 

 209. 

 210. 



211. 



212. 



213. 



214. 



215. 



216. 

 217. 



220. 

 221. 



222. 

 223. 

 224. 

 225. 



Page 



Ventral View of a Cuttle . . 277 



Ventral View of Sepia 

 Officinalis with Mantle- 

 Cavity cut open .. .. 278 



Dissection of Organs of Sepia 

 Officinalis from the Left Side 279 



Ventral View of Shell of Cuttle 279 



Semi-diagrammatic View of 

 Heart, Gills and Excretory 

 Organs of Sepia Officinalis . . 280 



A Belenmite Restored . . . . 284 



Lateral View of a Nautilus in 

 its Shell 285 



Ammonites or Fossil Nautiloid 

 Cephalopoda .. .. .. 286 



Diagrammatic Median Longi- 

 tudinal Section through an 

 Ascidian . . . . . , 289 



Oblique Section through an 

 Ascidian . . . , . . 293 



Development of an Ascidian . . 294 



Transverse Section of Larva of 

 Ascidian . . . . . . 294 



Transverse Section through 

 Embryo of an Ascidian . . 295 



Chordula Larva of an Ascidian 295 



Development of an Ascidian 295 



Tailed Larva of an Ascidian 

 seen from the Right Side . . 296 



Transverse Section through the 

 Tail of an Ascidian Larva . . 297 



Lateral View of Amphioxus 

 Lanceolatus . . . . . . 297 



View of Amphioxus from the 

 Right Side .. .. ._. 299 



Transverse Section of Amphi- 

 oxus behind the Atrium . . 300 



Transverse Section through 

 Amphioxus in the Pharyngeal 

 Region . . . . . . . . 301 



Median Section of Brain of 

 Amphioxus . . . . ^ . . 303 



Oblique Section of Amphioxus 

 through the Pharyngeal 

 Region _. 303 



The Development of Amphi- 

 oxus, as seen in Longitudinal 

 Section and Lateral View of 

 Larvae . . . . . . . . 304 



The Development of Amphi- 

 oxus, as seen in Sections .. 305 



Transverse Sections through 

 Young Amphioxus .. .. 306 



Lateral View of Young Pelagic 

 Amphioxus at (Commencement 

 of Larval Life . . . . . . 307 



Diagram of Young Pelagic 

 Amphioxus . . . . • . 307 



Lateral View of Myxine 

 Glutinosa . - . . . . 309 



Ventral Dissection of Myxine 

 Glutinosa .. .. ..3" 



Median Sagittal Section 

 through Myxine Glutinosa .. 312 



