xxiv LIST OP ILLUSTRATIONS 



KIO. ^^"^ 



225. Scole.x of Trenia echinocoocus . . 282 



220. Process of budding in Micro.stomuni ... . . 283 



227. Diagram of the relation.sliips of the Ph\tyhelmiiitlies and Nemer- 



tinea . . . . • 287 



228. Diagram of Nemertine . • 289 



229. Proboscis of Nemertine . . . 290 

 2:i(l. Tetra.stemnia . . . 291 

 2:')1. Anterior portion of Nemertine . . 292 

 2o2. Probosci.s of Hoplonemertean, retracted , 292 

 2:«. „ ,, everted . . . 292 

 2:^)4. Transverse sectif)n of Nemertine . . . 293 

 235. Vascular and excretory systems of Nemertine . 293 

 2:!(j. Pilidium ..... 294 



237. Ascaris lumbricoidi's . . . 298 



238. ,, „ transver.se section . . . 299 

 2.')y. „ ,, muscle fibres 300 



240. „ „ dissection of female 301 



241. Nervous system of Nematoda .... . 302 



242. Ascaris lumbricoides, dissection of m.ale organs 303 

 24.3. Body-wall of platymyarian Nematode 305 

 244. Dochmius duodenalis . . 306 



■245. Transverse section of Gordius . 30C 



246. Oxyuris . . 307 



247. Gordius, anatomy 308 



248. Development of Ascaris nigroveno.sa . . . 309 



249. Trichinella spiralis . . ... ,311 



250. Two species of Echinorhynchus (Gigantorhynchus) . 313 



251. Echinorhynchus gigas, dis.section of male . . . 314 



252. ,, „ ,, female . . 314 

 25.1 ,, „ „ nephridia . 315 



254. „ ,, female organs .... 315 



255. Sagitta hexaptera 316 



25(j. „ bipunctata, transverse .sections . 317 



257. „ „ head . . . 317 



258. ,, hexaptera, eye . . 318 



259. Development of Sagitta . . 318 



260. Chteto.soma , . . 319 

 201. Echinoderes . . ;i20 



262. Desmoscolex .... . . 320 



263. A trochophore ... . , , 322 



264, Brachionus rubens, female . 324 

 2^-"'- .. I, pharynx . ... ... 325 



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



267. Diagram of a Rotifer . . , , . . 327 



265, Paiaseison asplanchnus 329 

 209, Typical forms of Rotifera 331 



^^-'j- " -. „ : 332 



^71. ., ,, mastax _ . ,333 



