PLATE IX. 



Class 



CESTOIDEA. 



THE TAPE- WORM (Tcenia solium). 

 FIG. 1. TAPE- WORM, x 1. 



FIG. 2. HEAD : WITH THE CIRCLE OF HOOKLETS AND THE FOUR SUCKERS. 

 x 12. 



FIG. 3. HEAD : SIDE VIEW, x -V. 

 FIG. 4. HOOKLETS. x 50. 



FIG. 5. PROGLOTTIDES. x 6 T - 



w. water vessel : u. uterus : t. testis : v. d. vas deferens : va. vagina : 

 o. ovary : s. shell-gland : y. yolk- gland. 



FIG. 6. RIPE PROGLOTTIS. x 2. 



u. uterus : o. genital opening. 



FIG. 7. STAGES IN THE DEVELOPMENT OF THE TAPE- WORM. (After Leuckart.) 



a. egg with embryo : b. embryo : c. head, growing as a hollow papilla 

 on the wall of the vesicle : d. cysticercus with retracted head : 

 e. cysticercus with protruded head. 



