No. 5.] THE CESTODE MONIEZIA EX PANS A. 



22 5 



owing to the alternation in position of the partially divided 

 regions, the length of the right and left edges of the whole group 

 is the same, i.e., the abnormality in form of each segment com- 

 pensates for that of the others. Each partial proglotticl possesses 

 its own genital mass, so that there are five on the left side of the 

 group and four on the right. All partial furrows that are long 

 enough, i.e., all except that between e and /, show inter- 

 proglottidal glands, and all are of normal depth and distinctness. 

 The decreasing length of the partial furrows from the posterior 

 to the anterior set is noticeable, but whether it possesses any 

 special significance or not is not clear. 



Figure IO. 



Four cases of partial division of proglottids occur here, three 

 on the left and one on the right (a, b, c, d}. In each case the 

 partial furrows on the two surfaces correspond almost perfectly 

 in position and length and end free, not far from the middle of 

 the body. The relations 

 at the edges do not differ 

 from the normal except in 

 the case of b at the right. 

 This proglottid is partially 

 divided at the left, but the 

 undivided portion to the 

 right is as long as the two 

 partial proglottids at the 

 left, though no furrows 

 appear. The complete 

 genital mass g appears at 

 the normal distance from 

 the furrows bounding the 

 segment posteriorly, and 

 a partial second set of organs, e, /, appears in the anterior 

 region, consisting of the inner portion of the vas deferens, 

 e, two small groups of cells just posterior to it, which probably 

 represent the inner portion of the oviduct or the ovary, and 

 entirely unconnected with these at the right edge a pore with 



FIG. 10. 



