On the other hand, the ejaculatory duct with its verticillate sac in the male of Cypris and other genera is a feature scarcely less remarkable.
Close to the opening of the utriculus the ejaculatory ducts, already mentioned, open into the urethra by very small apertures.
Where the vesiculae join the ampullae of the vasa deferentia the ejaculatory ducts are formed; these are narrow and thin-walled, and run, side by side, through the prostate to open into the floor of the prostatic urethra.
The median vagina, spermatheca and ejaculatory duct are, on the other hand, formed by ectodermal inpushings.
The ejaculatory duct which opens on the ninth abdominal sternum in the adult male arises in the tenth abdominal embryonic segment and subsequently moves forward.
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