ABNORMALITIES IN CESTODE MONIEZIA. 



99 



the inner end of each band or zone lying in the region of the ne- 

 phridial tubes. The groups or aggregations of nuclei are so 

 indefinite that it is difficult to count them or to determine whether 

 they correspond on the two sides of the body. The nuclei of 

 the region between the nephridial tubes show no definite grouping. 





FIG. 48. 



Fig. 48, taken further posteriorly (see Fig. 46), shows a similar 

 arrangement of the nuclei within the longitudinal muscle layer. 



This peculiar arrangement of nuclei in this region varies some- 

 what as regards distinctness in different specimens. It can always 

 be made out in preparations which are well extended longitu- 

 dinally, but in contracted specimens the nuclei are so massed to- 

 gether that it often disappears. The examination of a large 

 number of specimens has, however, satisfied me that it is a normal 

 characteristic of this region. 



Fig. 49 is taken from a point near the posterior end of the 

 neck region (see Fig. 46) and shows bands of nuclei extending 

 across the central parenchyma, the first distinct evidences of pro- 



/ '." .'/, '. \ ' , -. . F 



:v - * =';';"- ;v : - ."' ' 



FIG. 49. 



glottid-formation. The arrangement of the nuclei in these bands 

 is probably due not so much to migration of the nuclei as to 

 more rapid multiplication of certain of them, thus forming aggre- 

 gations. It may be, however, that migration does occur to some 

 extent. From this point on, these parallel bands of nuclei be- 

 come more and more distinct and it is clearly evident that they 

 represent the proglottids. 



In Fig. 50 an arrangement of nuclei into transverse bands ex- 

 tending across the central -parenchyma is still more distinct and 



