ANNELIDA. 



63 



mentation to produce sperm-morulcr, each of which contains a 

 central sperm-blastophor covered by numerous small cells, sperm- 

 atoci/tes, which become sperms. These possess a long cylindrical 



Fig. 19. EARTHWORM (from Marshall and Hurst}. Plan of the reproduc- 

 tive organs as seen from above after removal of the alimentary canal. 

 The body-wall is pinned down flat. A, Anterior vesicula seminalis, 

 uniting with its fellow to form the anterior seminal reservoir (B) which 

 is cut open on one side to display an anterior spermary (testis) (T) and 

 an anterior seminal funnel. C, Middle vesicula opening into B. In 

 segment 12 is seen one of the posterior vesiculae, which unite to form 

 the posterior reservoir in 11. This is cut open to display a posterior 

 spermary (testis) and posterior seminal funnel (S F). VD, Vas deferens 

 or spermiduct ; 0, ovary ; D, oviduct ; 11, ootheca ; S, spermotheca ; 

 N, nerve-chain ; 9-15, ninth to fifteenth segments. 



