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Observations on the Nephridia of the Alciopinae. 



By 



E. S. Goodrich. 



With plate 12 and 2 figures in the text 



It is in the beautiful transparent pelagic Polychaeta belonging 

 to the subfamily Alciopinae that we can most easily observe the 

 relation of the true nephridia to the coelomostomes. The Alciopinae 

 are closely allied to the Phyllodocidae, with which they are generally 

 included in one faniily the Phyllodocidae. Already in 1900 x ) I was 

 able to show that in all these worms the nephridium is closed 

 internally, is provided at its inner end with well-developed soleno- 

 cytes, and that the genital funnel, or coelomostome, develops com- 

 paratively late becoming then grafted on to the nephridial duet. 

 An opening is formed at the point of junetion, and the genital 

 produets at maturity pass down the coelomic funnel into the nephridial 

 canal, and so to the exterior by the nephridial pore. 



For a summary of the literature dealing with the exeretory 

 organs of the Alciopinae I must refer the reader to my previous 

 paper, 1 ) since which no niore has been written on the subjeet, so 

 far as I am aware. 



Lately, I have had the opportunity of conflrming and extending 

 my observations at the Zoological Station at Naples, and am now 



1) On the nephridia of the Polychaeta, Part 3, in: Quart. Journ. 

 Micr. Sc, Vol. 43, 1900. 



