2 7 8 



CHILD. 



[VOL. I. 



in the middle of the edge as it is bounded dorsally. In b very 

 similar conditions exist, but the bend in the dorsal surface 

 of the segment is more pronounced than in a. The ducts 

 are more oblique than in a and elongated, but preserve the 

 same relations to the segment. The dorsal furrow forming 

 the anterior boundary of b curves to such a degree that it does 

 not reach the edge at all, thus leaving it apparently undivided, 

 i.e., not distinct from the edge of c. Near the middle of this 

 common edge a single pore appears, and into this open the 



FIG. 37. 



ducts from c as well as those from b. The ducts of the organs 

 in c cross the course of the curved dorsal furrow to reach the 

 edge, but this part of the furrow is very slight. 



The organs at the left of d present an extremely interest- 

 ing relation with respect to the furrow. The dorsal furrovV 

 between c and d turns anteriorly and runs parallel to the edge, 

 but the furrow in front of d is straight. The ducts of the 

 genital organs show no tendency to run parallel to the curved 

 furrow, but meet it almost at right angles, and the pore ap- 

 pears in this furrow instead of upon the edge of the body. 

 The furrow is deeper than the one posterior to it which crosses 

 the ducts in r, apparently without affecting their position. 



