274 INVERTEBRATE PHYSIOLOGY 



have been difficult to apply to worms. Studies conducted on oligochaetes 

 lead to the conclusion that filtration occurs, perhaps under the pressure 

 differential set up by the flame cells. Open nephridia in many species add 

 coelomic fluid to a blood filtrate, increasing the economy of a process of 

 reabsorption. Quantitative evidences for secretion are lacking and an ex- 

 tension of the current inquiries promises to be fruitful. 



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