DESCRIPTIONS OF GENERA AND SPECIES 



581 



(3) There are unpaired calciferous pouches in the segments immediately anterior 



to that in which a pair of calciferous glands lie. 



(4) Nephridiopores paired on each segment. 



These same characters are met with in Polytoreutus, Tdeudrilus, Hyperiodrilus, 

 Heliodrilus, and possibly in Paradrilus and Preusda. In the two last-mentioned 



