No. 5-] THE CESTODE MONIEZIA EXPANSA. 221 



end, c and d, consist of partial segments on the right side. The 

 separation of these is complete on both sides of the body. 



Figure J>. 



In this case two proglottids are incompletely separated on the 

 upper side, because the furrow on the right side is slightly 

 anterior to that on the left. The two parts of the furrow over- 

 lap slightly, i.e., the left part extends past the 

 inner end of the right part, and each ends 

 free. On the lower side the furrow at the right 



FIG. 3. 



bends anteriorly and meets the complete furrow 

 anterior to it, thus marking off completely the small partial 

 segment. The longer partial furrows correspond exactly on the 

 two surfaces. Apparently the right and left portions of the fur- 

 rows have been formed independently and have failed to meet. 



Figure 4. 



In the segment a this figure shows a case where the segment 

 is of less than normal length at the left edge, and where, more- 

 over, the bounding furrows on the lower surface do not extend 

 to the edge but bend so as to meet on the surface of the 



segment a short distance from the edge. 

 In b and c a rather simple case of partial 

 division is represented. The partial furrow 

 on the upper surface extends from the right 

 edge to a point near the middle of the seg- 



FlG. 4. 



ment and there ends. At the left there is 



no furrow on the upper surface corresponding to this one, so the 

 whole left half appears undivided. On the lower surface, how- 

 ever, the furrow between b and c is normal, extending across the 

 whole body, meeting the upper furrow at the right edge and 

 ending in a slight indentation on the left edge. At the right c 

 is about twice as long as b, but at the left b is much the longer 

 of the two. This difference is due to the fact that the furrows 

 anterior to c are somewhat oblique. 



