xxiv LIST OF ILLUSTRATIONS 



FIG. PAGE 



228. Scolices .277 



229. Scolex of Tsenia echinococcus 277 



230. Process of budding in Microstomum 278 



231. Bilharzia haematobia 281 



232. Diagram of the relationships of the Platyhelminthes and Nemertinea 283 



233. Diagram of Nemertine 284 



234. Proboscis of Nemertine 285 



235. Tetrastemma ... 286 



236. Anterior portion of Nemertine 287 



237. Proboscis of Metanemertean, retracted 287 



238. everted 287 



239. Transverse section of Nemertean 288 



240. Diagram of anterior end of Nemertean 289 



241. Pilidium 290 



242. Ascaris lumbricoides 293 



243. ,, ,, transverse section 294 



244. muscle fibres 295 



245. dissection of female 296 



246. Nervous system of Nematoda 297 



247. Ascaris lumbricoides, dissection of male organs 297 



248. Body-wall of platymyarian Nematode 300 



249. Dochmius duodenalis 300 



250. Transverse section of Gordius 301 



251. Oxyuris . 302 



252. Gordius, anatomy 303 



253. Trichinella spiralis 305 



254. Two species of Echinorhynchus (Gigantorhynchus) .... 307 



255. Echinorhynchus gigas, dissection of male 308 



256. female 308 



257. nephridia 309 



258. female organs 309 



259. Egg of Echinorhynchus acus 310 



260. Sagitta hexaptera 311 



261. bipunctata, transverse sections 312 



262. head 312 



263. hexaptera, eye 312 



264. Development of Sagitta .313 



265. Chsetosoma . 313 



266. Echinoderes 314 



267. Desmoscolex 314 



268. Trochophore 316 



269. Brae hi onus rubens, female 318 



270. pharynx ......... 319 



271. ,, ,, male and female, with attached eggs . . 319 



272. Diagram of a Rotifer 320 



273. Paraseison asplanchnus 322 



274. Typical forms of Rotifera 324 



275. . . . 325 



