No. 6.] THE CESTODE MONIEZIA EXPANSA. 



2 73 



Figure JJ. 



This figure shows a rather long spiral, together with a small 

 completely separated partial proglottid. The furrows bounding 

 the spiral begin between the partially separated segments a and 

 b near the left side of the dorsal surface --the dorsal surface is 

 uppermost in the figure --and make a little over three turns 

 about the body. At the left side of the dorsal surface, between 

 the segments d and c, the furrow becomes shallower, and on 

 the left edge it terminates. The spiral segment enclosed by it 

 makes a little more than two complete turns. In consequence 

 of the course of the furrow, a and b are incompletely separated 

 on the dorsal surface, but completely separated ventrally ; the 

 furrows bounding the regions b, c, 

 and d do not correspond on the two 

 surfaces, and finally d and c, which 

 are distinct dorsally, are completely 

 united on the ventral surface. These 

 abnormal relations are accompanied 

 by a number of corresponding abnor- 

 malities in the genital organs. At 

 the left side a is distinct from b, and 

 the genital organs a' on this side are 

 normal and in normal position. At the left side of b, c, and d, 

 where the spiral character of these segments becomes evident, 

 the genital organs show marked abnormalities. At b' only two 

 small groups of cells are found, representing apparently portions 

 of the ducts ; at c' and d' full sets of organs occur, but lie obliquely, 

 and the ducts are elongated. It is evident that the pores and 

 the greater portions of the ducts are normal in position with 

 regard to the dorsal form relations of the segments. The 

 oblique direction of the ducts is apparently due to the fact that 

 the dorsal side of c and d bends forward near the left edge. 

 Since the inner portions of the organs are formed at the normal 

 distance from the edge, in order to reach the edge as they do, 

 the ducts must be longer than the normal, for they must run 

 obliquely. 



The dorsal sides of b and c both correspond in part, as 



FIG. 33. 



