No. 6.] THE CESTODE MONIEZIA EXPANSA. 275 



all, and on the lower surface the segment next to a narrows 

 toward the left and ends at the edge. 



Figure 35. 



The figure shows a complex case of partial division (a) and 

 a spiral of about four turns (b c). The region a is partially 

 separated into two segments at the 

 right, but at the left into three, the 

 most anterior (b) forming the beginning 

 of the spiral. On the lower side, just 

 beneath /;, there is a small region wholly 



marked off by furrows and not form- 



ing part of the spiral. The spiral b c 



is perfectly simple in form, though 



rather long. This case, like Fig. 34, was found near the 



anterior end of the chain, and neither genital organs nor 



inter-proglottidal glands are formed. 



Figure j6. 



The figure is a dorsal view of an extremely long spiral, 

 which makes seven complete turns about the body. The 

 spiral is due to the bending posteriorly of the ventral furrows 

 near the right edge. 



At the left the segments are all normal in form, and all of 

 the genital organs are normally placed. At the right the 

 curve in the ventral furrows produces complex relations in the 

 various segments. All of the curved portions of the ventral 

 furrows except the one anterior to c are much shallower than 

 the transverse parts, as is indicated in the figure. In the one 

 exception, the furrow anterior to c, the curved portion appears 

 as distinct and deep as the rest of the furrow. In a, b, d, c, 

 and / the inner portions of the organs of the right side are 

 seen to lie in about their normal positions with respect to the 

 boundaries of their segments. The ducts are parallel to the 

 dorsal furrows and cross the course of the ventral furrows in 

 each case, i.e., they conform to the relations on the dorsal side. 

 In the segment c, however, the ducts run nearly parallel to the 



