THE BIOLOGY OF AN ANIMAL. 



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

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

 missure ; e.g., cerebral ganglia ; (fe, dissepiment : /, funnel of nephridium ; np 

 nephridium; o, ovary; od, oviduct; pft, pharynx; ps, prostomium ; r.s., seminal 

 receptacle; .d., sperm-duct; .f., sperm-funnel; 8.V.I., lateral seminal vesicle; 

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



