xxiv LIST OF ILLUSTRATIONS 



FIG. PAGE 



225. Scolex of Trenia echinococcus . ' . 282 



226. Process of buckling 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. Tetrastemrna . .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 platymyariaii 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 (Gigantorhynehus) . . 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. Chtetosoma . . 319 



261. Echinoderes . 320 



262. Desmoscolex . 320 



263. A trochophore . . 322 



264. Brachionus rubens, female . . 324 



265. ,, ,, pharynx 325 



2(56. ,, ,, male and female, with attached eggs . 326 



267. Diagram of a Rotifer . . 327 



268. Pataseison asplanchnus . 329 



269. Typical forms of Rotifera . . 331 



270. ... .332 



271. ,, ,, mastax 333 



