234 



CHILD. 



[VOL. I. 



Figure //. 



The figure represents two partially separated segments seen 

 from the dorsal surface. At the right the division is complete 

 and the genital organs are normal. 



The ventral furrow extends without interruption about three- 

 quarters across the ventral surface, but is somewhat irregular in 

 its course. The dorsal furrow is interrupted at two points, once 

 just to the right of the middle and again near the left side, leav- 

 ing a short portion, c, entirely separated from the rest. This 

 portion does not reach the left edge, but turns anteriorly near it 

 and ends abruptly. The ventral furrow shows no portion cor- 

 responding to this portion, c, consequently the segments are 



visibly separated only on 

 the dorsal surface in this 

 region. The abnormal re- 

 lations of the furrows are 

 accompanied by abnormal 

 conditions in the genital 

 organs. The case is some- 

 what similar to the one 

 appearing in Fig. 16, and confirms the conclusions reached 

 in the discussion of that case. The posterior portion, a, is 

 longer than b and possesses a normal set of organs normally 

 situated, while in b there is a complete vas deferens and pore, 

 but no trace of ovary, vitellarium, or oviduct. Analysis shows a 

 very close relation between the organs and furrows. The case 

 is very similar to Fig. 16, but presents some differences. The 

 partial furrow c is dorsal, but is deeper than the furrow in Fig. 

 1 6 ; i.e., the division between a and b is a little more complete 

 here than there, and the ovary and vitellarium of a lie further 

 posteriorly. A second set of female organs does not appear, 

 probably because the region b is not separated from a on the 

 ventral side and is considerably shorter than a, so that the single 

 ovary and vitellarium serves for the whole length of a b. On 

 the dorsal surface the partial furrow c shows that different rela- 

 tions exist, and here in the shorter portion, /;, there is formed a 

 complete vas deferens and pore. The pores in a and b are 



FIG. 17. 



