264A Diagram of male genitalia of a strongylid 368 265 Transverse section through the ovarian tube of _Belascaris cati_ of the cat 369 266 Male of the rhabditic form of _Angiostomum nigrovenosum_ 370 267 Transverse section through the posterior extremity of the body of _Ascaris lumbricoides_ (male) 370 268 Hind end of a male _Ascaris lumbricoides_ cut across at the level of the dilator cells of the gut. (After Goldschmidt) 371 269 A piece of the trunk muscle of the pig with encapsuled embryonic Trichinæ 373 270 _Strongyloides stercoralis_, female. (After Looss) 380 271 _Strongyloides stercoralis_, male. (After Looss) 380 272 _Strongyloides stercoralis_, female. (After Looss) 382 273 _Strongyloides stercoralis._ (After Looss) 382 274 _Strongyloides stercoralis._ (After Looss) 383 275 _Gnathostoma siamense._ (After Levinsen) 385 276 Guinea worm (_Dracunculus medinensis_). (After Leuckart) 387 277 Anterior extremity of Guinea worm. (After Leuckart) 387 278 _Dracunculus medinensis._ (After Claus) 387 279 Transverse section of female Guinea worm. (After Leuckart) 388 280 _Cyclops virescens_, female 389 281 _Filaria bancrofti._ (After Leiper) 391 282 _Mf. bancrofti_ in thick film, dried and stained with hæmatoxylin. (After Fülleborn) 397 283 Schematic drawings of the anatomy of _Ml. loa_ and _Mf. bancrofti_. (After Fülleborn) 399 284 _F. demarquayi._ (After Leiper) 403 285 _Mf. demarquayi_ in thick film, dried and stained with hæmatoxylin. (After Fülleborn) 404 286 _Filaria_ (?) _conjunctivæ_. (After Addario) 405 287 _Filaria_ (?) _conjunctivæ_. (After Grassi) 405 288 _Setaria equina._ (After Railliet) 408 289 _Setaria equina_: anterior end. (After Railliet) 408 290 _Loa loa_: the anterior end of the male. (After R. Blanchard) 410 291 _Loa loa_: anterior portion of the female. (After Looss) 410 292 _Loa loa_ in situ. (After Fülleborn and Rodenwaldt) 410 293 _Loa loa_: male and female. (After Looss) 410 294 _Loa loa_: the hind end of a male and of a female. (After Looss) 411 295 _Loa loa_: lateral view of tail of male showing papillæ. (After Lane and Leiper) 411