ABNOMALITIES IN CESTODE MONIEZIA. 



103 



than between them. Moreover, an indistinct arrangement in 

 groups of the nuclei of these lateral regions of the central paren- 

 chyma does appear, especially on the left side. The groups of 

 nuclei are so illy defined in the preparations in toto, where the 

 whole dorso-ventral thickness of the central parenchyma is seen, 

 that it can scarcely be expected that a section only a few micra 

 (7) in thickness, and thus containing only a small part of the 

 total number of nuclei in a given group, should show the arrange- 

 ment any more clearly. The nuclei of the peripheral paren- 

 chyma are very few in number and scattered, showing no indi- 

 cation of any arrangement in groups corresponding to those of 

 the central parenchyma. 



In Fig. 45, a sagittal section near the median plane, the nuclei 

 are seen to be most abundant in two regions, near the outer mar- 



FIGS. 53-54. 



gins of the central parenchyma, appearing in the section as two 

 longitudinal bands of nuclei, which are in reality sections of two 

 layers of nuclei, a dorsal and a ventral layer. These layers were 

 indicated indistinctly in the transverse sections shown in Figs. 42 

 and 43. The tendency to aggregation of the nuclei into groups 

 which is present in the lateral regions of the central parenchyma 

 is not visible here, or at least not sufficiently distinct to appear in 

 the section. As regards this point the section confirms the ob- 

 servations on the whole mounts. The region from which this 

 section was taken corresponds approximately to the region from 

 which Fig. 48 was drawn, being probably a little posterior to it. 



