No. 5.J THE CESTODE MUNIEZIA EXPANSA. 239 



furrow is complete and takes a slightly curved course, but the 

 ventral is divided into three parts. At the left one portion 

 extends from the edge obliquely inward and anteriorly to a point 

 near the middle, where it ends. The second portion lies on the 

 right side, is almost transverse, and extends nearly to the right 

 edge, overlapping with the third portion which reaches the edge 

 at a point anterior to the corresponding dorsal furrow. Upon 

 the edge it turns posteriorly and passes backward to the point 

 where the dorsal furrow reaches the edge, and there it turns 

 inward again, extends for a short distance, and terminates freely, 

 thus almost surrounding a small region on the ventral surface at 

 ,v. Notwithstanding these irregularities the furrows between c 

 and d approximate to the normal conditions, but the ventral fur- 

 row is a little anterior to the dorsal, except in the short portion 

 posterior to x. At the right relations are normal. 



Returning now to the genital organs in the segments b and c, 

 we find in each segment a complete set on each side. Consider- 

 ing first the organs in the left side of b and c, it is seen that in b 

 the inner portions are normally placed, but the pore lies rather 

 more anteriorly than its normal position. As noted above, there 

 is a short spiral here owing to the course of the dorsal furrow in 

 c, and the edge corresponding to c is not separated dorsally from 

 b. This accounts for the position of the pore in b ; i.e., the 

 organs in c are situated very much as they would be if there 

 were no dorsal furrow at all between b and c in this region. 

 The only indication of division on the dorsal surface in the 

 region of the ducts is the very slight furrow curving forward. 

 This seems not to affect the course of the ducts at all, for they 

 cross it at right angles to reach the edge. The extreme posterior 

 position of the pore in c, i.e., its approximation to that of b, is 

 evidently due to the same causes as the displacement of the pore 

 in b, vis., the absence of dorsal division in this region. 



At the right in b and c somewhat similar conditions exist. 

 The positions of the inner portions of the organs are about nor- 

 mal. As regards ducts and pores on the right, there is the same 

 approximation as on the left. This end of the dorsal furrow in 

 c is incomplete, ending, after bending forward, free on the surface 

 just dorsal to the middle region of the ducts, and the ventral fur- 



