GENEKAL INDEX. 



CHAPTER VII. 



HELMINTHOZOA. 



Page Sec. 



HELMINTHOZOA General history of the 128 . 335 



ENTOZOA TV . . 129 . 336 



Ccenurus cerebralis 129 . 339 



Cysticercus 130 . 340 



CESTOIDEA . V , 130 . 341 



Tanice or tape-worms *,'.. 130 . 341 



Anatomy of Tcenia solium 131 . 342 



Longitudinal canals 132 . 343 



Structure of mature segment or proglottis 132 . 344 



Mode of impregnation 135 . 346 



Development of Tamioid Entozoa 135 . 347 



Structure of the ovum 135 . 348 



"Scolex" 135 . 349 



Cysticercus a Scolex of Ttsnia 135 . 350 



" Strobile" or body of the Entozoon . . , 136 . 350 



Developed by gemmation from the Scolex or " head " .... 136 . 351 



Separation of the " proglottis " or adult Tamia 136 . 352 



Development of proglottis 136 . 352 



Segments of the Strobile enjoy a community of life 137 . 354 



Growth of " proglottis" after its detachment from the " Strobile " 137 . 355 



Enormous fecundity of the Tsenioid Helminthozoa 137 . 356 



Envelope of the ova 137 . 357 



Oviposition of " proglottis " 138 . 358 



M. Miescher's observations relative to the metamorphoses of the 



Helminthozoa 138 . 359 



M. Van Beneden's account of the metamorphoses of Tetrarhynchus 138 . 360 



CYSTOIDEA Transformation of Cystiform Entozoa into Tasniae . . 140 . 367 



Echinococcus veterinorum 140 . 368 



TREMATODA 141 . 369 



Distoma (Fasciola, Linn.) hepaticum 141 . 370 



General history of Distoma 141 . 370 



Alimentary apparatus 141 . 370 



Nervous system 142 . 371 



Generative system of Distoma 142 . 372 



They are hermaphrodite 142 . 373 



Structure of female generative organs 142 . 374 



male generative organs 142 . 375 



Development and metamorphoses of the Trematode Helminthozoa 143 . 376 

 Observations of Nitzsch, Bojanus, Steenstrup, Siebold, &c., relative 



to the " alternate generation " of the Distomata 143 . 378 



Steenstrup's account of the metamorphoses of Cercaria echinata . 144 . 379 



Monostomum mutabile 147 . 388 



HELMINTIIOZOA ACANTHOCEPHALA 148 . 390 



Anatomy of Echinorhyndius gigas 148 . 391 



Structure of retractile proboscis 148 . 391 



alimentary canal 149 . 392 



Lemnisci 149 . 393 



The Echinorhynchi are dioecious 149 . 394 



Structure of female generative organs 149 . 394 



Floating ovaria described by Siebold as existing in some Acantho- 



cephalous Helminthozoa 149 . 395 



Male organs of Echinorhynchus 150 . 396 



TURBELLARLE 150 . 397 



PLANARI.E 150 . 398 



Nervous system of PlanaricB 151. 400 



Their power of surviving mechanical division . . .'-.- . . . 151 . 403 



Structure of their digestive system 152 . 404 



Visceral cavity 152 . 405 



