No. 424.] THE. GENUS -TRYPANOSYLLIS. 301 
A pair of problematic. organs, possibly much-modified 
nephridia, are. present in each segment. These organs are 
tubular, with rather narrow lumen, their thick walls composed 
of columnar, much-vacuolated cells (Fig. 6.4), and no opening 
has been seen at either extremity. They occupy a ventral 
position, the internal extremity being directed towards the 
median line, and the outer extremity obliquely towards the 
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of the stock. — x 46. 
ventral body wall, which it penetrates as far as the epidermis. 
It is known that in several species of syllidians the segmental 
organs serve as genital ducts, and for this purpose undergo 
enlargement at-sexual maturity.! Such a function would seem ' 
to be impossible in this instance when we compare the diameter 
of the ova with the diameter of the tubes. _ 
1 Ehlers, Emst. Die Borstenwiirmer (1864), p- 205. 

