276 



CHILD. 



[VOL. I. 



ventral furrows, crossing the dorsal furrow which forms the 

 posterior boundary of c, and finally opening, together with 

 the organs in b, into a single pore on the edge of b. This case 

 appears to be an exception to the general rule of correlation 

 between the arrangement of the genital organs and the form 

 of the segment, for the ducts on the dorsal side cross the 



FIG. 36- 



course of the dorsal furrow. As is evident from the figure, 

 the ventral side of c and the dorsal side of b are very inti- 

 mately connected at the right edge, more so than, for instance, 

 the ventral side of c with the dorsal side of d. Moreover, the 

 edge of c itself is oblique and very short, and the ventral fur- 

 row at x is deeper than the corresponding portions of the 

 other ventral furrows. The course of the ducts from the 

 organs at the right of c, differing as it does from the course of 



