66 



THE BIOLOGY OF AN ANIMAL. 



U.TV.C. 



FlQ. 29.— Anterior portion of the earthworm laid open from above, with the alimen- 

 tary and circulatory systems dissected away, c.c, circum-oesophageal com- 

 missure ; e.g., cerebral ganglia ; d*% dissepiment : /, funnel of nephridium ; np 

 nephridium ; o, ovary ; od, oviduct ; p^i, pharynx ; ps, prostomium ; r.s., seminal 

 receptacle; s.d.^ sperm-duct; s.f., sperm-funnel; s.vi.l.^ lateral seminal vesicle; 

 t, testis ; r.g., and v.ii.c., ventral nerve-cord. 



