An oviduct emerges from the ovary on the side opposite to the 

 oogonial chanaber. The latter is well isolated from the ovary, has a 

 different structure than the envelope of the ovary, reaches a different 

 length and ends entering the ootype. 



Fig. 97. Schematic representation of different types of ovaries of mono- 

 genetic trematodes. Explanation in text. 



Among many Capsalidae and related forms a special chamber 

 from which the oviduct emerges (Fig. 98) is isolated inside the ovary. This 

 chamber apparently serves for the accumulation of a certain number of 

 ripened egg cells before the beginning of accelerated egg laying. There is 

 reason to believe that at the same time it can also serve as a receptaculum 

 seminis inside the ovary. 



A number of ducts open into 

 the oviduct in front of the ootype, to 

 be specific, vitelline ducts, vaginal 

 duct, and genito-intestinal duct. In 

 addition to that receptaculum seminis 



O.Imh 



Fig. 98. Benedenia derzhavini 

 (Layman), ovary with the in- 

 terior chamber. 



also opens into the oviduct, or the ovi- 

 duct itself forms a widening which is 

 also designated as a receptaculum 

 seminis . The places of junction of 

 all of the enunne rated ducts into the 

 oviduct can be very close together 

 and then is fornned a comnnon large 

 cavity in the oviduct which does not 



have a special name, but which plays a significant role in the functioning 

 of the female sex system, as our study has shown, (see page 85 ). How- 

 ever, it is more fitting to consider the oviduct as being divided into two 

 separate parts. Specifically, as the oviduct (oviductus) must be considered 

 that part which extends fronn the ovary to the place ot junction with the 

 vitelline ducts, whereas the part leading from the vitelline duct to the 



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