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Oll the Structure of the Nephridia of Stichostemma. 



By 

 Thos. H. Montgomery jr., Ph. D. 



With Plate 23. 



A study of the nephridia of Stichostemma eilhardi Montg., a 

 freshwater Nemertean which I have previously described (in: Z. wiss. 

 Zool, V. 59), has resulted in demonstrating that the nephridia of this, 

 in many respects aberrant form, have a structural development and 

 arrangement, such as occurs in no other Nemertean. The results of 

 this investigation are accordingly given here, in the hope that they 

 may be of interest from a comparative anatomical standpoint. 



These studies are based entirely upon an examination of series 

 of sections; at the time of this undertaking I had only preserved 

 material, and accordingly had no opportunity to experiment with the 

 intra-vitam methylene blue staining, a method, which in the hands of 

 Bürger ('92) has proved to be of much value. 



The literature upon these organs in Nemerteans has already been 

 compiled by Bürger ('92, '95), so that I shall content myself with 

 giving a list of the papers treating of this subject, at the end of this 

 contribution. 



A. Anatomy. 



There is not a single pair of nephridia, one on each side of the 

 body, as in all other Xemerteans, but in Stichostemma there are 10 on 

 the right and 8 on the left side of the body. Those on the one side 

 communicate in no wav witli those on the other. On each side of 



