ABNORMALITIES IN CESTODE MOXIEZ1A. 



lO/ 



show them less clear.ly. It is interesting to note that the group- 

 ing of the nuclei in the peripheral parenchyma appears first in the 

 lateral regions as represented in Fig. 57. Sagittal sections of 

 this stage near the median plane show no grouping of the periph- 

 eral nuclei there, although in the central parenchyma the bound- 

 aries of the proglottids are quite distinct. Here again the earliest 



FIG. 57. 



stages of development appear near the main nerve-cords and 

 extend gradually to the other parts. 



A little later the boundaries of the proglottids become visible 

 on the surface (Fig. 52), and sections at this stage show still further 

 increase in the number of nuclei, especially 

 in the central parenchyma. Fig. 58 rep- 

 resents a sagittal section near the median 

 line. The furrows are beginning to appear 

 on dorsal and ventral surfaces. The out- 

 lines of the proglottids are distinct within 

 the central parenchyma and the transverse 

 nephridial canals have appeared. The 

 scarcity of nuclei in the peripheral paren- 

 chyma is noticeable, but the few present 

 are more or less distinctly grouped. 



A somewhat later stage is represented in 

 the frontal section, Fig. 59. Here the subcuticular cells, which 

 are represented schematically by the dotted region at the mar- 

 gin, have become indistinctly grouped, the spaces between the 

 groups corresponding to the inter-proglottidal furrows. The 



FIG. 58. 



