201 Section through a piece of a _Cœnurus cerebralis_ 304 202 Median section through a cysticercus. (After Leuckart) 304 203 _Cysticercus pisiformis_ in an evaginated condition 304 204 Various chains of segments of _Dibothriocephalus latus_ 311 205 Transverse section of the head of _Dibothriocephalus latus_ 311 206 Fairly mature proglottis of _Dibothriocephalus latus_ 311 207 _Dibothriocephalus latus._ (After Benham and Schauinsland) 312 208 Plerocercoid of _Dibothriocephalus latus_ 313 209 A piece of the body wall of the Burbot, _Lota vulgaris_ 313 210 Cephalic end of _Dibothriocephalus cordatus_. (After Leuckart) 315 211 _Diplogonoporus grandis_, Lühe, 1899. (After Ijima and Kurimoto) 317 212 _Diplogonoporus grandis._ (After Ijima and Kurimoto) 317 213 Cephalic end of _Sparganum mansoni_, Cobb. (After Leuckart) 318 214 _Sparganum mansoni._ (After Ijima and Murata) 318 215 _Sparganum prolifer._ (After Ijima) 319 216 _Sparganum proliferum._ (After Stiles) 319 217 _Dipylidium caninum._ (After Diamare) 320 218 _Dipylidium caninum._ (After Benham and Moniez) 320 219 _Dipylidium caninum_: central portion of a proglottis. (After Neumann and Railliet) 321 220 _Dipylidium caninum_: development of embryo. (After Benham, Grassi, and Rovelli) 321 221 Larva (cysticercoid) of _Dipylidium caninum_. (After Grassi and Rovelli) 322 222 _Hymenolepis nana_, v. Sieb. (After Leuckart) 324 223 _Hymenolepis nana_: head. (After Mertens) 324 224 _Hymenolepis nana_: an egg. (After Grassi) 324 225 Longitudinal section through the intestinal villus of a rat. (After Grassi and Rovelli) 324 226 _Hymenolepis nana_ (_murina_): cross-section of proglottis from a rat. (After v. Linstow) 325 227 _Hymenolepis nana_: longitudinal section of an embryo. (After Grassi and Rovelli) 325 228 _Hymenolepis diminuta._ (After Zschokke) 326 229 _Hymenolepis diminuta._ (After Grassi) 326 230 _Hymenolepis diminuta._ (After Bizzozero) 326 231 _Hymenolepis diminuta._ (Stephens, after Nicoll and Minchin) 327 232 _Hymenolepis lanceolata._ (After Krabbe) 328 233 _Hymenolepis lanceolata._ (After Wolffhügel) 328 234 Scolex of _Davainea madagascariensis_. (After Blanchard) 330