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 -. Fig. 159. — Sexual organs of Both- 



of Tmnia cosnurus. ( x 10.) ■. riocephedus latua (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 Tania — Stieda {Archiv 

 f. Naturgesch., 3ah.rg. xxviii., p. 200,1862), Pagensteoher [Zeitschr. f. wise. Zool.iBd. 

 ix., p. 523, 1858), ^euerej^^^ifef^ ja^.«sgu^^y^, 1868), v. Linstow (Archiv f. 

 Naturgesch., Jahrg. xli., p. 1S7, TOto), £tod Kahane (he. cit.). 



