terioriy through the body <:avity. For the time being, 

 Anaplcctus and PIcctxa might be considered aberrant 

 oflFshoots while AiionchHS. by slight transformation, could 

 account equally well for the origin of the Adenophori 

 system as for the Secernentes system. Thus, again we 

 find the Plectidae holding the key to points in nemic 

 evolution. 



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133 



