230 



CHILD. 



[VOL. I. 



shallow and indistinct and terminate on the surface near the right 

 edge. As in Fig. 12, a and b, two complete sets of genital 

 organs appear on the right side, the posterior set being normal 

 and the anterior set situated somewhat obliquely, with the pore 



near that of the posterior 

 set. The positions of the 

 two sets of organs are un- 

 doubtedly the result of con- 

 ditions similar to those in 

 Fig. 1 2, a and b, and are to 

 FlG - I3- be explained in the same way. 



It is noticeable that the curve at the right ends of the furrows 

 appears to have no significance as regards the position of the 

 organs, which are situated as they would be if the furrows ended 

 without bending forward. The furrows become very slight here, 

 being little more than wrinkles on the surface. 



Figure /./. 



Two cases of partial division, a b and c d, are shown in this 

 figure, viewed from the ventral surface. The partial furrows on 

 the two surfaces correspond in both cases. Between a and b 

 they extend from 

 the left edge to a 

 point just beyond 

 the middle of the 

 body, thus leaving 

 almost the right 

 half undivided, 

 and, correspond- 

 ing to the partial 

 division, one set 

 of organs is found 

 at the right, while two appear at the left. The division between 

 c and d is more complete, extending from the left edge over 

 about three-quarters of the width of the body, and in this case, 

 although the right edge itself shows no furrow, two sets of organs 

 occur at the right as well as at the left, but their pores are much 



- - -'- <rvJZ- 



FIG. 14. 



