bro'in— 



lotcral blood vessel 



_proboscis 



ona< 



dorsal blood vessel 



nerve cord 



lo+erol blood vessel 



ig. 10-8. A longitudinal and cross-seCion of a ne.ertine showing the t„be-wi.hin-a-tube body p.on 

 ^ and also the beginnings of a circulatory system. 



Fig 



