1 



10 



13 



15 



FIG. 80. Anterior portion of an earthworm laid open from above, with the alimentary 

 and circulatory systems dissected away, c.g, cerebral ganglia; rf, dissepiment; l.n, 

 lateral nerves; n 1 , first nephridium; od, oviduct; ov, ovary; p.c, pharyngeal collar, in- 

 side which are the pharyngeal ganglia; ps, prostomium; s.d, sperm-duct; s.g, setiger- 

 ous glands; s.r, seminal receptacles; s.v, seminal vesicle; i 1 , V, t 3 , testes; v.g, ventra- 

 ganglion. 



