XX 



LIST OF ILLUSTRATIONS. 



CucuUanus, Embryo of, . 

 Cysticercus — 



Head rudiment of an adult ( x 12), 



Subretinal, in the eye (after de Wecker), 



With evaginated head ( x 3), . 

 Cysticercus acanthotrias — 



Head and circlet of hooks seen from above, after Weinland ( x 60), 



Hooks of, after Weinland ( x 280), .... 



Cysticercus arionis — 



With head retracted and protruded ( x 50), 



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Cysticercus cellulosai — 



Completion of the head formation in ( x 15), 



Head of, with rudiment of the receptacle ( x 25), 



Metamorphosis of the head-process into the head proper ( x 20), 



The beginning of the bending of the head inside its receptacle 

 (x 26), ..... 



Various stages in the formation of the head of ( x 45), 



With the formation of the head just beginning { x 10), 



With the head in the receptacle ( x 2), 

 Cysticercus fasciolariSf ..... 

 ,, ,,..... 



Cysticercus glomcridis — 



(After Villot) (x 50), .... 

 (x 200), .... 



„ ^ (X 50) 



Cysticercus pisiformis — 



A piece of hver from the rabbit, showing passages made by, 



Before the development of the head, with granular sheath and 

 cyst ( X 60), ..... 



Head and body of, in completely evaginated state ( x 19), 



Head of, with vascular system ( x 45), . 



Head of, just mature ( x 40), 



Metamorphosis of the head of ( x 45), 



Piece of rabbit's liver with passages of ( x 10), 



With head half evaginated ( x 6), 



Young, .... 

 Cysticercus racemosus — 



(After Marchand), 



(After von Siebold), 

 Cysticercus TcenicB saginatce — 



Embedded in the muscle, 



Evaginated head of ( x 30), 



Head of, with frontal sucker and vascular ring ( x 30), 



Head-rudiment of, before and after the development of the suckers 

 ( X 25) 



Longitudinal section through the head in situ ( x 30), . 

 Cysticercus tenebrionis, Development of, after Stein ( x about 100), 

 Cysticercus tenuicoUis — 



(After Bremser), ...... 



Anterior end of, with retracted neck and rlbbon-Uke appendage, 



Exit of a young, from the liver, ..... 



Longitudinal section through the head of an adult ( x 20), 



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