240 CHILD. [VOL. 1. 



row also bends forward. The ducts in c, however, are situated 

 as if the curved portions of the furrows were not present ; that 

 is, as if the furrows, especially the dorsal, ended about where 

 they begin to bend. 



The right edge corresponding to b and c is undivided, and the 

 pores are accordingly approximated as on the left side. The 

 separation of the two segments is normal up to within a short 

 distance of the edge, and thus probably determines the existence 

 of two separate pores, instead of the union of the two sets of 

 organs in one. 



The significance of the curved ends of the furrows in c requires 

 a brief consideration. As mentioned above, they are very slight, 

 being mere wrinkles, and though they are continuous with the 

 normal inter-proglottidal furrows, they are not like these in 

 appearance. The position of the genital organs does not appear 

 to bear any direct relation to them, for the ducts cross them to 

 reach the edge. Undoubtedly the slight development of these 

 curved ends indicates a very incomplete separation of the parts 

 which they bound, and, as will appear later, it is possible that such 

 furrows do not always coincide with the real segmental boundaries. 



The position of the organs in c and d appears to be nearly 

 normal. At the right the pore lies very near the end of the 

 abnormal ventral furrow, but about in the middle of the edge, as 

 bounded dorsally, thus showing that its position is determined, at 

 least largely, by the relations on the dorsal side. At the left the 

 pore is approximate to the pore in b, evidently because of the 

 absence of division on the dorsal surface at the edge. 



The segment e is apparently perfectly normal, but f and g show- 

 abnormal relations, being separated on the right but united on 

 the left. The partial furrows extend from the right edge a short 

 distance past the middle of each surface and end free, the termi- 

 nal portions being shallower than the rest. Thus the left side is 

 without any true furrows, but the surface shows certain indica- 

 tions of a division between the two parts. From the end of the 

 furrows to the edge there extends a depression in each surface 

 too broad and indistinct to be called a furrow, but still apparently 

 indicating a certain degree of separation (not shown in the figure). 

 It reaches the edge in the slight depression between the two 



