228 



CHILD, 



[VOL. I. 



conditions are nearly those of a single normal segment, so that 

 only a single pore appears. 



Inter-proglottidal glands lie in the partial furrows on each sur- 

 face. 



Figure 12. 



The figure, a view from dorsal surface, shows three- segments 

 which are all incompletely separated at the right side. At the 

 left the separation is complete, the furrows appear normal, and 

 the genital organs in process of formation are normal in position 

 and form. On the right the furrows separating the segments 

 a and b end at d and e, before reaching the edge, the furrow on 

 the ventral side becoming shallow and rather irregular in its 



course (e) but extending almost 

 to the edge, while the dorsal fur- 

 row ends more abruptly at a 

 greater distance from the edge 

 . The furrows between the 



9 



a 



segments b and c do not reach 

 the right edge, but end rather 

 abruptly near it at/, the points of 



termination on the two surfaces of the body being about equi- 

 distant from the edge. Thus the whole right edge shows no 

 traces of division into separate segments, but nevertheless pos- 

 sesses three genital pores, two of which are near together. The 

 ovaries and vitellaria and the inner ends of the vasa deferentia 

 at the right of a and b are normally situated with regard to the 

 furrows, for at this distance from the edge the relations are 

 practically those of two normally distinct proglottids. As we 

 approach the right edge, however, the dorsal furrow, d, ends 

 abruptly at some distance from the edge, while the ventral fur- 

 row, e, becomes more shallow and finally disappears near the edge. 

 The terminal portions of the ducts lying nearer the dorsal sur- 

 face are affected in greater degree by the relations on the dorsal 

 surface, and we find here that as the ducts approach the edge 

 they also approach each other, the approximation being almost 

 wholly due to the abnormal direction of the ducts of the set b' . 

 The organs at a' lie in the normal position, but those at b' lie 



