No. 5.] THE CESTODE MONIEZIA EXPANSA. 



231 



nearer together than at the left, where the separation of the seg- 

 ments is complete and normal. It appears from the arrangement 

 of the organs at the right that the two segments c and d do pre- 

 serve a certain degree of individuality in the region beyond the 

 end of the partial furrows, for if this were not the case we should 

 expect to find only one pore instead of two, a condition which 

 does frequently occur. The position of the ovary and vitel- 

 larium at the right of d is peculiar. The ducts, instead of 

 bending posteriorly, extend straight inward, and the ovary lies 

 nearer the middle of the segment than the others. This posi- 

 tion is apparently due to the form relations here. The distal 

 portions of the two sets of organs at the right of c and d are 

 approximated, but the partial furrows between c and d extend to 

 the region of the ovaries, and d is slightly shorter in this region 

 than c, so that the ovary and vitellarium in d take the position 

 in which they can attain most nearly their normal development. 

 Inter-proglottidal glands occur in the partial furrows as well 

 as in those which are complete. 



Figure 1$. 



This figure shows a case of partial division in which the 

 partial furrows are nearly complete. The segments are rather 

 old, the ovaries and ducts being in process of degeneration and 

 the uterus containing embryos (not drawn in figure). 



At the left side the segments are normally bounded, and the 

 genital organs are apparently normal. At the right the partial 



FIG. 15. 



furrows end before reaching the edge, and two sets of organs 

 occur, opening into a common pore. The partial furrows extend 

 so nearly to the edge that in the ovarian region the two segments 



