26 EARTHWORMS AND THEIR ALLIES [ch. 



are apt to be very large and conspicuous. They are 

 also generally unpaired, a character which is however 

 not confined to the Eudrilidae ; for there are Mega- 



'mmm 



Fig. 10. Ventral view of Polytoreutusjinni, head end ( x 2), 

 lettering as in fig. 9. ' 



scolecids, such as Fletcherodrilus, and Geoscolecids 

 in which the same unpaired character occurs. The 

 principal feature of the family is that the ovaries are 



