3U 575 



310 573 



309 572 

 the body-cavity 



213 366 



29 45 



68 104 



69 108 

 35 57 

 39 60 



LIST OF ILLUSTEATIONS. xxi 



Fro. PAGE 



The head process ( x 15), ..... 310 673 



Three months old, 



Young, ..... 



Young, in situ, .... 



Development of an EcliinococcusAike cysticercoid from 



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

 Distomum hcematobium, male and female, 

 Distomum Jiepaticum — 



(Natural size), .... 



Ciliated embryo of, with an eye speck, . 

 Egg of, with embryo, 

 Free embryo of, . 



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 trigonocephalus — 



j4, Free living young form ; ^, Young parasite, . . 63 99 



Rhahditis-hke condition of young stage of, . . . 43 62 



Echeneihothrium minimum — 



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



Chain of joints of, . . . . . . 1 34 273 



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



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



tinaca, ..... . 133 273 



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



Echinococ<yus, ........ 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), .... 



Diagrammatic representation of a proliferating, . 



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



brood-capsule, after Navmyn ( x 60), 

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

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



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

 Hooks ( X 600), ....... 



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



Proliferation of the membrane of an, .... 



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

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



Section through an, ...... 



EcJiinococcus raccmosus, . . .... 



Echinococcus vdcrinorum — . .... 



Brood-capsule of, with adult and hollow rudimentary heads 



(X 40) 



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



Echinorhynclius angnstatus, male, . . . . • 



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

 EcJiinorhynclms gigas, Egg of, with embryo, .... 



.£cA.i?ior74)/?i<;/! us spM'«7«, natural size (after Westrumb), 

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

 Entozoa in the second stage Wl^'^&l^i}^,MiCrOSOft® 



