xxiv LIST OF ILLUSTRATIONS 



FIG. . PAGE 



225. Scolex of Tsenia echinococcus . . 282 



226. Process of budding in Microstomum 283 



227 Diagram of the relationships of the Platyhelminthes and Nemer- 



tinea 287 



228. Diagram of Nemertine . 289 



229. Proboscis of Nemertine 290 



230. Tetrastemina 291 



231. Anterior portion of Nemertine 292 



232. Proboscis of Hoplonemertean, retracted 292 



233. ,, ,, everted 292 



234. Transverse section of Nemertine 293 



235. Vascular and excretory systems of Nemertine 293 



236. Pilidium 294 



237. Ascaris lumbricoides 298 



238. ,, ,, transverse section 299 



239. muscle fibres 300 



240. ,, dissection of female .... . 301 



241. Nervous system of Nematoda 302 



242. Ascaris lumbricoides, dissection of male organs .... 303 



243. Body- wall of platymyarian Nematode 305 



244. Ankylostoma duodenale 306 



245. Transverse section of Gordius 306 



246. Oxyuris 307 



247. Gordius, anatomy 308 



248. Development of Ascaris nigrovenosa 309 



249. Trichinella spiralis 311 



250. Two species of Echinorhynchus (Gigantorhynchus) .... 313 



251. Echinorhynchus gigas, dissection of male . . . . . . 314 



252. ,, ,, female 314 



253. ,, ,, ,, nephridia 315 



254. ,, ,, female organs 315 



255. Sagitta hexaptera .... 316 



256. ,, bipunctata, transverse sections ...... 317 



257. head 317 



258. ,, hexaptera, eye 318 



259. Development of Sagitta 318 



260. Chsetosoma ..... .319 



261. Echinoderes 320 



262. Desmoscolex 320 



263. A trochophore .... 322 



264. Brachionus rubens, female 324 



265. ,, ,, pharynx 325 



266. ,, ,, male and female, with attached eggs . . 326 



267. Diagram of a Rotifer 327 



268. Paraseison asplanchnus 329 



269. Typical forms of Rotifera 331 



270. ,, 332 



271. mastax . . 333 



