166 HANDBOOK OF INVERTEBRATE ZOOLOGY. 



nally upon the median line, a little behind the globular 

 portion. 



(ii.) Two convoluted white glandular bodies, the vesi- 

 cula seminales, are situated a little anterior to, but in 

 the same somite with, the penis. They open into this at 

 one end, and at the other they connect with — 



(iii.) The testes, nine pairs of small white glandular 

 bodies situated close to the nerve cord. The first pair are 

 in the fourth somite behind that which contains the penis, 

 and the others are in the eight following somites, a little in 

 front of the seo-mental oro-ans. 



6. The female reproductive organs. These are in the 

 somite next behind that which contains the penis, and are 

 made up of: — 



(i.) The vagina; a ' muscular sac upon the median 

 line. 



(ii.) The twisted oviduct running from the top of the 

 vagina. It soon divides into two branches which run 

 down towards -the ventral surface, and terminate in the 

 small white ovaries. 



7. In the segment next behind that which contains the 

 female organs, notice the two pairs of white convoluted 

 mucous glands. 



8. Make a sketch showing the reproductive organs in 

 place. 



9. The nervous system. This consists of : — 



(i.) A double commissural cord, which runs from one 

 end of the body to the other, and consists of two fibres 

 which lie side by side in a common sheath for the greater 

 part of their length. 



(ii.) The series of twenty-one ganglia. 



(a.) The first of these is the largest, and gives off five 

 pairs of nerves. 



