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1. The Cœlom and Nephridia of Flatworms 



Reply to M. Van Ben ed en. 

 by E. Ray Lankester, Jodrell Professor of Zoology, University Coll., London. 

 Before offering what I hope may be a final reply to M. Van Be- 

 ne den, I should wish to say that I regret having made use of expres- 

 sions in my previous note on this subject, which appear to him dis- 

 courteous. The vexation which I experienced on finding myself per- 

 sistently misinterpreted; caused me to Avrite unguardedly. I trust that 

 both my apology and my excuse may be accepted. 



M. Van Bene den has in so many words in his first communi- 

 cation to this Journal on this subject, attributed to me the theory that 

 »the sanguino-lymphatic system of triploblastic animals, — whether it be 

 formed of lacunae, of canals or of large cavities, and the urinary 

 canals whatever their form are parts, more or less completely 

 difierentiated and separated of one and the same system of lacunar 

 spaces.« 



In his last communication to this Journal, M. Van Beneden 

 admits in reply to my remarks on this statement, that he has been in 

 error. He admits that I have not maintained that the urinary canals 

 are parts of the same system of lacunar spaces as the sanguino-lym- 

 phatic system. He admits that I have on the contrary maintained 

 that the urinary canals and the sanguino-lymphatic spaces are distinct 

 in nature and origin and to be distinguished as separate morphological 

 elements. So far I have succeeded in inducing M. Van Beneden to 



