REPRODUCTIVE SYSTEM. 73 



somewhat nearer the median plane than the 

 anterior vesiculse. 

 iii. A thin-roofed median vesicula seminalis, of 

 considerable size, is situated in each of the 

 segments x. and xi. below the oesophagus, 

 which must be removed to expose them. 

 Within each are a pair of testes and a pair of 

 seminal funnels. With the anterior of these 

 median vesiculse the anterior lateral vesiculse 

 and the first pair of posterior lateral vesiculse 

 communicate. The second pair of posterior 

 lateral vesiculse open in similar fashion into 

 the second median vesicula. 



The median vesiculse are absent in Allo- 

 lobophora. 



b. The testes are two pairs of small flattened digitate 

 bodies, attached to the septa in front of segments 

 X. and XI. respectively, and projecting freely 

 into the cavities of the median vesiculse seminales, 

 not far from the nerve-cord. 

 To see- the testes, open the two median vesicula seminales 

 without injuring the structures within them. Wash care- 

 fully. 



0. The seminal funnels are large opaqile white mucli- 

 • folded membranous funnels, of which one pair is 

 situated in each median vesicula seminalis, the 

 open mouth being turned towards the testes, 

 and almost enclosing them. Their narrow ends 

 perforate the hinder septa of their respective 

 segments (x. and xi.), and are continuous with 

 the vasa efferentia. 



d. The vasa deferentia. From the posterior end of 

 each seminal funnel a fine convoluted tube, the 

 vas efi'erens, runs outwards and backwards on 

 the ventral body-wall. The twtf vasa efferentia 

 of each sjde unite in segment xii., and the vasa 

 deferentia so formed run back to open to the 



