PHYLUM ANNULATA 



201 



along each side of the ventral surface, so that there are 

 altogether eight of these short setae in each segment. A 

 thickened zone the saddle or cliteUum is to be observed 



B 



FIG. 109. Lumbricus agricola. A, entire specimen, lateral view ; B, ventral view 

 of anterior portion of the body, magnified, i, 15, 33, first, fifteenth, and thirty- 

 third segments. The black dots represent the setae. (After Vogt and Jung.) 



extending over five segments, in front of the middle of the 

 body. In internal structure there is a considerable re- 

 semblance between Nereis and the Earthworm but in the 



