LIST OF ILLUSTRATIONS xxiii 



FIG. PAGE 



177. Dicyema paradoxum, "male 231 



178. Rhopalura giardii, male . 232 



179. female 232 



180. Salinella, longitudinal section 233 



181. ,, transverse ,, . . 234 



182. Planaria, digestive and excretory systems 237 



183. ,, nervous system . . . 237 



184. ,, reproductive system . . . ... . . . 239 



185. Transverse section of a Planarian .../. 240 



186. Distomum hepaticum . . . ... 240 



I,s7. }} ,, section of integument . ... . 241 



188. ,, ,, internal organisation ,-. . . . 242 



189. ,, ,, terminal part of reproductive apparatus . 243 



190. ,, ,, development 244 



191. Tamiasoliurn . . ... , 246 



192. head . . . , . .. . . . . . 247 



193. ,, ,, transverse section . . . . , . . . 247 



194. ,, ,, proglottis 248 



195. ,, ,, ripe proglottis . 250 



196. ,, ,, development . 251 



197. Various Planarians . . 255 



198. Gunda segmentata, . ... - 256 



199. Digenetic Trematodes .257 



200. Gyrodactylus and Polystomum . . . ' . . . . . 258 



201. Temnocephala . . . . ,. . . .... . .259 



202. Actinodactylella . ..... . . . . . .260 



203. Tetrarhynchus .... . "..,.. . ... .261 



204. Trenia echinococcus . . . . 261 



205. Ligula . . . . . ... . . . . .262 



206. Caryophyllams . 263 



207. Gyrocotyle . . . . . , . ..-.-. . . . - . 263 



208. Archigetes . . .... ..... . . . 263 



209. Section of body- wall of a Triclad .-..,-_ 264 



210. Parenchyma of Flat- worm . . . >.-. . . . . 265 



211. Diagram of Rhabdoccele . . . . . . .... .266 



212. ,,Polyclad. . ....... . .266 



213. ,, Triclad . . . . . . . . / . . .267 



214. Flame-cell ....".- 269 



215. Reproductive organs of Mesostomum ehrenbergii .... 272 



216. Development of a Polyclad 274 



217. Miiller's larva ....;. 275 



'218. Embryos of Dendroccelum . . . . . . if . .. . 276 



219. Embryo of Temnocephala . . < . ., . , . . . 278 



220. 279 



221. A Cysticercoid . . . . 280 



222. ,, with head evaginated 281 



223. Cyst of Tsenia echinococcus 282 



224. Scolices . 282 



