No. 6.] 



THE CESTODE MONIEZIA EXPANSA. 



263 



the beginning of a spiral furrow which makes one and a half 

 turns. It is oblique upon the lower side, running from between 

 a and b at the left to the anterior edge of b at the right, then 

 passing over the upper surface again as a complete transverse 

 furrow anterior to b, and finally end- 

 ing free on the lower surface. Thus 

 the spiral segment b is open at both 

 ends. If the furrow between a and 

 b on the upper surface were com- 

 plete, the spiral would begin between 

 a and b at the right on the lower 

 surface, and the furrow would thus 

 make almost two turns. In the 

 region where the genital masses appear the furrows show very 

 nearly normal relations, and the position of the genital masses 

 needs no comment. 



In c d another case of simple partial division occurs at the 

 left, the partial furrow corresponding in position on the two 

 surfaces. At the left two genital masses occur, while at the 

 right, where c d is undivided and shorter than at the left, 

 only one appears. All the partial furrows which extend far 

 enough from the edges to lie within the region where the inter- 

 proglottidal glands occur, possess them. The furrows between 

 a and b on the right show none, as they are too short. 



FIG. 25. 



Figure 26. 



This case consists of a short spiral in which the spiral furrow 



makes one and a half 

 turns about the body. As 

 the result of its course 

 the partial proglottid b is 

 formed, which unites on 

 the upper surface with a, 

 and on the lower with c. 

 In the lateral regions 



FIG. 26. 



the segmental boundaries 

 are all normal, and, accordingly, the organs are situated nor 



