REPRODUCTIVE SYSTEM 



67 



a. The vesicnlse seminales vary greatly in form and 

 size with the season of the year. When fully 

 developed they form conspicuous milk-white 

 bodies at the sides of the oesophagus, and over- 

 lapping it. 

 i. A pair of anterior lateral vesiculae seminales lie 



Fig. 24.^-1. umbricus terrestris. Plan of the reproductive organs as seen 

 from above after removal of the alimentary canal. The body-wall 

 is pinned down flat. (c. h. h.) 



A, anterior lateral vesicula serainalis. B, first median vesicula seminalis. 

 C, posterior lateral vesicula seminalis. M", nerve-cham. 0» ovary. OD, 

 oviduct. B, receptaculum ovorum. S, spermathecse. SF, seminal funnel 

 lying in the median vesicula seminalis. T, testis. VD, vas deferens : the 

 reference Une indicates the point where the posterior vas eflerens opens into it. 

 9 to 15) ninth to fifteenth segments. 



p 2 



