2 So 



CHILD. 



[VOL. I. 



the dorsal surface the furrows are normal, and the regions cor- 

 responding to c and d are parts of a single segment. Thus 

 the spiral furrow bounding c and d begins ventrally between 

 b and c, makes one turn, then bends anteriorly, separating c 

 and d, next makes another almost complete turn and finally 

 ends on the ventral surface anterior to d, so that d is not com- 

 pletely separated from the segment next anterior to it. 



At the right of b the edge is very long in consequence of 

 the curve in the posterior furrows, but there are indications 

 that these curved portions of the furrows do not mark the 



FIG. 38. 



actual posterior boundary of b. Along the line m the cellular 

 structure appears denser and stains more deeply, thus resem- 

 bling in appearance the regions near the intersegmental fur- 

 rows. There is no real furrow here, but the presence of this 

 band of tissue similar to that which occurs along segmental 

 boundaries indicates that the posterior boundary of b is here 

 and not along the curved furrows ; that is, these latter are mere 

 wrinkles in the surface continuous with the intersegmental 

 furrows. If this be the correct interpretation of the condi- 

 tions here, it is evident that the ovary and pore at the right of 

 b present the usual correlation in position with the form of the 

 segment. 



