No. 6.] THE CESTODE MONIEZIA EXPANSA. 267 



in the furrow, but since the furrow ends free at c and f both 

 ends of the spiral proglottid bounded by it are open and connect 

 respectively with a and c. The position of the genital masses 

 is not affected by the presence of the spiral arrangement. 



The general relation of the inter-proglottidal glands to the 

 furrows is shown by the fact that the glands appear with the 

 abnormal and partial furrows as well as with the normal. 



Figure JO. 



This figure shows two spirals situated in the regions desig- 

 nated by a and b. In each case the spiral is due to the curv- 

 ing of the furrow near the median line of the body. In the 

 one case the curve is on the dorsal sur- 

 face, in the other on the ventral. Since 

 the curved furrows are on opposite sur- 

 faces and yet nearly parallel, the two 

 spirals are opposite in direction. In 

 both cases the ends of the spiral por- 

 tions unite more or less completely with 

 adjacent segments, owing to the fact 

 that the furrows between them end free. 



In b this union is much more complete than in a. In a the 

 spiral furrow makes two turns about the body, in b only one 

 and a half as a continuous furrow. If, however, the partial 

 furrows at the right in b be considered as a continuation of it, 

 this furrow also makes two complete turns. 



The lateral regions and edges of the segments are all normal 

 in form, and we find all the genital masses normal in position. 



Figure Ji. 



The figure is a view from the dorsal side of a series of seg- 

 ments, showing a number of abnormalities. The first of these 

 is the small partial segment b, wedged in at the right between 

 a and c. Its dorsal surface is greater than its ventral, and its 

 edge is nearly as long as that of a normal segment. Dorsally 

 the furrow between a and /; ends free on the surface. The 



