446 EXPLANATION OF THE PLATES. 



Fig. 7. Head of Tcenia solium with its vascular system, which probably anastomoses 

 before and behind, as shown by the dotted line. 



8. Head of Tcenia solium in front. 



9. Crown of hook-sacs on the head of Tcenia solium. 



10. Penis and uterus of the same magnified three times. 



11. Tcenia mediocanellata of Kiichenmeister. 



12. Uterus and penis of the same (magnified 1£). 



13. Egg of the same. 



14. Tape-worm from the Cape of Good Hope. 



15. Uterus of the same. 



16. Eggs of the same. 



17. Echinococcus scolicipariens, Kiichenmeister = E. veterinorum. 



a. With the stalk dependent and head drawn in. 



b. Free, with the vascular system, after Wedl. 



c. Hooks of the first row (magnified 400 times). 



d. The same of the second row. The small free points indicate free moving 

 Echinococci, those attached to the sides of the cyst are the scolices (natural 



size). 



18. Echinococcus altricipariens, Kiichenmeister = E. hominis (a cyst diminished). 



a. Daughter-vesicles of natural size. 

 a'. The same with Echinococci magnified. 



b. The same with grand-daughter vesicle of natural size. 



c. The same separated from its stalk in the urinary bladder (of natual size). 



d. Exhihits the further process of nesting. 



e. Isolated free Echinococci. 



f. Hooks of the first row (magnified 400 times). 



g. The same of the second row. 

 The dots indicate the small Echinococci which swim freely in the fluid of the cyst. 



19. A transverse incision through the walls of the mother- and daughter-vesicles. 



PLATE (TAB.) IV. 



1. Tcenia Echinococcus scolicipariens magnified. 



2 — 4. Hooks of the same of the first row, magnified 650 times. 



5 — 6. The same of the second row. 



7 — 8. The same deformed. 



9. Egg of this Tcenia. 



10. Hooks of Echinococcus altricipariens magnified 650 times. 



a, c, d. Hooks of the first row. 



b, e. The same of the second row. 



11. Distoma heterophyes, after Bilharz. 



12. Prickle of the penis of the same. 



13. Distoma in the eye, after Von Ammon. 



14. Distoma in eye. 



15. The same isolated. 

 The diagram represents the hooks of various tape- and cyst-worms, according 



to their relative size. 



a. Total length. 



b. Length of stalk. 



