LIST OF ILLUSTEATIONS. XXI 



FIG. PAGE 



The head process ( x 15), ..... 310 573 



Three months old, ...... 311 575 



Young, ........ 310 573 



Young, in situ, . . . . . .309 572 



Development of an Echinococcus -like cysticercoid from the body-cavity 



of the earth-worm, after Mecznikoff ( x 25), . . .213 366 



Distomum hcematobium, male and female, . . . " . 29 45 

 Distomum hcpaticum 



(Natural size), . . . ... .. 68 104 



Ciliated embryo of, with an eye speck, . . * . 69 108 



Egg of, with embryo, . . . . .. 35 57 



Free embryo of, . . . . . 39 60 



Distomum luteum (young), with suckers and viscera (after de la Valette), 1 6 



Dochmius duodenalis, Cephalic extremity of ; profile and front view, . 10 18 

 Dochmius trigonoccphalus 



A, Free living young form ; B, Young parasite, . . 63 99 



Rhabditis-like condition of young stage of, . . . 43 62 

 Echeneibothrium minimum 



(After van Beneden) ( x 8), . . . .226 389 



Chain of joints of, . . -. . . .134 273 



,, ,, isolated living head and tape- worm, . 24 and 25 37 

 Isolated living head of, from the intestine of Tryyon pas- 



tinaca, ..... . 133 273 



Strobila and proglottis of (after van Beneden), . . 135 and 136 274 



Echinococcus, . . . . . . . .13 19 



Before the beginning of the segmentation ( x 15), . . 319 591 



Bladder, eight weeks old ( x 20), . . . .321 597 



Brood-capsule of, with adherent heads in various stages of de- 

 velopment ( x 36), ...... 204 357 



Brood-capsule of, with retracted head and with two appended 



buds at different stages ( x 100), .... 314 579 



Diagrammatic representation of a proliferating, . . . 205 357 

 Head, metamorphosis of an, into a bladder in the interior of the 



brood-capsule, after Naunyn ( x 60), . . .331 620 



Head, with the anterior part of the head invaginated ( x 90), . 323 604 

 Heads, development of the, from those hanging freely into the 



internal cavity of the brood-capsule, after Wagener ( x 90), 327 608 



Hooks (x 600), 315 581 



In its natural size and position, . . . . . 329 613 



Proliferation of the membrane of an, . . . . 330 614 



Young, four weeks old, escaping from the capsule ( x 50), . 320 594 



Echinococcus multilocularis ( x 30), ..... 335 629 



Section through an, . . . . . - 333 624 



Echinococcus racemosus, . . . . . .334 628 



Echinococcus veterinorum . .... 317 587 



Brood -capsule of, with adult and hollow rudimentary heads 



( x 40) ,326 608 



Head of ( x 90), ......... 322 603 



Echinorhynchus angustatus, male, . . . . . 11 18 



Embryos of ; (^4) the profile; (B) ventral view,. . . 72 112 



Echinorhynchus gigas, Egg of, with embryo, .... 37 57 



Echinorhynchus spirula, natural size (after Westrumb), . . 71 110 



Eggs of worms found in the alimentary canal of man, . . . 90 146 



Entozoa in the second stage of development, , .. ... 45 68 



