240. THE BUTTERFISH 334 241. THE BLACK GOBY 335 242. THE FATHER LASHER 335 243. THE LESSER WEAVER 337 244. THE COMMON PORPOISE 341 245. _Callithamnion roseum_ 359 246. _Callithamnion tetricum_ 359 247. _Griffithsia corallina_ 361 248. _Halurus equisetifolius_ 361 249. _Pilota plumosa_ 361 250. _Ceramium diaphanum_ 363 251. _Plocamium_ 366 252. _Delesseria alata_ 368 253. _Delesseria hypoglossum_ 368 254. _Laurencia pinnatifida_ 371 255. _Laurencia obtusa_ 371 256. _Polysiphonia fastigiata_ 373 257. _Polysiphonia parasitica_ 374 258. _Polysiphonia Brodiæi_ 374 259. _Polysiphonia nigrescens_ 374 260. _Ectocarpus granulosus_ 378 261. _Ectocarpus siliculosus_ 378 262. _Ectocarpus Mertensii_ 378 263. _Sphacelaria cirrhosa_ 379 264. _Sphacelaria plumosa_ 379 265. _Sphacelaria radicans_ 380 266. _Cladostephus spongiosus_ 380 267. _Chordaria flagelliformis_ 380 268. _Laminaria bulbosa_ 384 269. _Laminaria saccharina_ 384 270. _Alaria esculenta_ 385 271. _Sporochnus pedunculatus_ 385 272. _Desmarestia ligulata_ 386 273. _Himanthalia lorea_ 387 274. _Cystoseira ericoides_ 388 275. TRANSVERSE SECTION OF THE STEM OF A MONOCOTYLEDON 391 276. LEAF OF A MONOCOTYLEDON 392 277. EXPANDED SPIKELET OF THE OAT 393 278. THE SEA LYME GRASS 395 279. _Knappia agrostidea_ 397 280. THE DOG'S-TOOTH GRASS 397 281. THE REED CANARY GRASS 397