201. THE MANTIS SHRIMP (_Squilla Mantis_) 270 202. THE OPOSSUM SHRIMP (_Mysis chamæleon_) 271 203. PARTS OF LOBSTER'S SHELL, SEPARATED, AND VIEWED FROM ABOVE 272 204. A SEGMENT OF THE ABDOMEN OF A LOBSTER 272 205. APPENDAGES OF A LOBSTER 273 206. LONGITUDINAL SECTION OF THE LOBSTER 274 207. THE SPINY LOBSTER (_Palinurus vulgaris_) 275 208. THE NORWAY LOBSTER (_Nephrops norvegicus_) 276 209. 1. THE MUD-BORER (_Gebia stellata_). 2. THE MUD-BORROWER (_Callianassa subterranea_) 277 210. THE COMMON SHRIMP (_Crangon vulgaris_) 278 211. THE PRAWN (_Palæmon serratus_) 279 212. _Dromia vulgaris_ 282 213. THE HERMIT CRAB IN A WHELK SHELL 282 214. THE LONG-ARMED CRAB (_Corystes Cassivelaunus_) 287 215. SPIDER CRABS AT HOME 288 216. THE THORNBACK CRAB (_Maia Squinado_) 290 217. THE PEA CRAB (_Pinnotheres pisum_) 290 218. THE COMMON SHORE CRAB (_Carcinus mænas_) 291 219. THE SHORE SPIDER 294 220. THE LEG OF AN INSECT 295 221. TRACHEA OF AN INSECT, MAGNIFIED 296 222. SEA-SHORE INSECTS 298 223. MARINE BEETLES OF THE GENUS _Bembidium_ 302 224. MARINE BEETLES 303 225. TRANSVERSE SECTION THROUGH THE BONY FRAMEWORK OF A TYPICAL VERTEBRATE ANIMAL 306 226. THE SEA LAMPREY 309 227. THE PILCHARD 310 228. THE SKELETON OF A FISH (PERCH) 315 229. THE INTERNAL ORGANS OF THE HERRING 316 230. THE EGG-CASE OF THE DOGFISH 319 231. THE SMOOTH HOUND 320 232. THE COMMON EEL 323 233. THE LESSER SAND EEL 326 234. THE THREE-BEARDED ROCKLING 327 235. THE SNAKE PIPE-FISH 328 236. THE RAINBOW WRASS (_Labrus julis_) 330 237. THE CORNISH SUCKER 330 238. THE FIFTEEN-SPINED STICKLEBACK AND NEST 331 239. THE SMOOTH BLENNY 333