306 



THE ANATOMY OF CESTODES. 



remark, in the first place, that the male apparatus consists usually of 

 a large number of testicular sacs, whose delicate orifices open into 

 a seminal duct with cirrhus-pouch and cirrhus (penis). In the female 

 apparatus we have to distinguish not only an ovary (germarium) and 

 yolk-gland (albuminiparous gland), which co-operate in the formation 

 of the eggs, but also two kinds of exit ducts, a vagina, which serves 

 for the reception of the semen, and a uterus, which collects the 

 fertilised eggs, and often contains them until the formation of the 

 embryo. With the vagina there is often connected a receptaculum 

 seminis, and at the beginning of the uterus, where the oviducts are 

 connected with the posterior end of the vagina, there is yet another 

 special organ or shell-gland (Figs. 158 and 159). 



The presence of a separate yolk-gland along with the ovary is a 

 peculiarity which the Cestodes share with numerous other flat-worms, 

 and especially with the Trematodes. The secretion furnished by the 

 gland surrounds the eggs, which in their state of formation possess 

 only a thin, clear protoplasmic sheath, and thus during the whole of 



FIG. 158. Sexual organs 

 of Tcenia ccenurus. ( x 10.) 







FIG. 159. Sexual organs of Both- 

 riocephalus latus (from the ventral 

 side), (x 20.) 



their sojourn in the ovary exhibit conditions which in other cases exist 

 only for a short time, until the deposition of the granular yolk. Such 



tors concerning the structure of the sexual organs in other forms of Tccnia Stieda (Archiv 

 f. Naturgesch., Jahrg. xxviii., p. 200, 1862), Pagenstecher (Zeitschr. f. wiss. Zool., Bd. 

 ix., p. 523, 1858), Feuereisen (ibid., Bd. xviii., p. 161, 1868), v. Linstow (Archiv f. 

 Naturgesch., Jahrg. xli., p. 187, 1875), and Kahane (loc. cit.). 



