CYCLOPHYLLIDL*: 



57 



dilating into a vesicle which acts as spermatheca. The 

 ovaries are on each side of the tube, and round the tube 

 are the shell-glands. Posteriorly are the vitellaria or 

 yolk-glands, and the ducts from these also open into the 

 dilated portion of the vagina. The ova are therefore fer- 

 tilized, and receive their yolk and thin shell in the terminal 

 part of the vagina. They are not discharged through the 

 vagina, but pass into a divertieulum from it which runs 



W.T), 



FIG. 23. a, Testes; b, vasa efferentia ; c^ vas deferens ; d, genital pore; 

 <?, vagina ; _/, receptaculum seminis ; g, uterus ; h, shell-gland ; ?', ovary ; 

 /, vitellaria or yolk-glands ; w.v.s., water vascular system. 



along the length of the proglottis (fig. 23). As the eggs 

 accumulate lateral pouches are formed in the divertieulum 

 which is known as the uterus. In the cyclophyllidiae the 

 uterus has no natural external opening. 



The classification of the Cestodes occurring in man is 

 based on the character of the scolex, the development of 

 the embryo, and the arrangement of the genital organs. 

 In Cyclophyllidice the genital pores are at the edges, in the 

 Pseudophyllidiae on the flat surface (fig. 24). 



