LIST OF ILLUSTRATIONS xxi 



FIG. I'AliK 



183. Trenia solium, proglottis . . 234 



184. ,, ,, ripe proglottis 236 



185. ,, ,, development 236 



186. Various Planariaiis 240 



187. Gunda segmentata 241 



188. Digeiietic Trematodes 242 



189. Gyrodactylus and Polystomum - . . 243 



190. Temnocephala 244 



191. Actinodactylella 245 



192. Tetrarhynchus 246- 



193. Tsenia echinococcus .... 246 



194. Ligula 247 



195. Caryophyllseus' 247 



196. Amphiptyches ..... 247 



197. Archigetes .247 



198. Section of body- wall of a Triclad 248 



199. Parenchyma of Flat-worm 249 



200. Diagram of Rhabdocoele 251 



201. ,, Polyclad 251 



202. ,, Triclad 252 



203. Flame-cell 253 



204. Reproductive organs of Mesostomum ehrenbergii .... 256 



205. Development of a Polyclad 257 



206. Miiller's larva 258 



207. A Cysticercoid 260 



208. ,, with head evagiiiated 261 



209. Cyst of Tseiiia echinococcus 262 



210. Scolices ,, ,. 262 



211. Scolex ,, ,, 262 



212. Process of budding in Microstomum 263 



213. Diagram of the relationships of the Platyhelminthes and NCIIHT- 



tinea 267 



214. Diagram of Nemertine 268 



215. Tetrastemma - 2(5!) 



216. Anterior portion of Nemertine 270 



217. Proboscis of Hoplonemertean, retracted 270 



218. ,, everted 270 



219. Transverse section of Nemertine 271 



220. Vascular and excretory systems of Nemertine 271 



221. Pilidium 272 



222. Ascaris lumbricoides 276 



223. ,, ,, transverse section 277 



224. ,, ,, muscle fibres . 278 



225. ,, ,, dissection of female 279 



226. Nervous system of Nematoda 280 



227. Ascaris lumbricoides, dissection of male organs 281 



228. Body-wall of platymyarian Nematode 283 



229. Dochmius duodenalis 284 



230. Transverse section of Gordius 284 



