CHILD. 



47 



central parenchyma are seen to be more abun- 

 dant at the two sides between the nephridial 

 canals and the muscles. In Fig. 45, which is 

 taken from a sagittal section in the median line 

 (see line 45, Fig. 53, p. 103), the nuclei of this 

 region are seen to be most abundant near the 

 outer boundary of the central parenchyma. 



The earliest stages of the growth of the 

 body occur in the neck-region and the prog- 

 lottids appear at the posterior end of the neck. 

 Consideration of the method of proglottid- 

 formation requires, therefore a study of the 

 neck-region, and to this the following para- 

 graphs are devoted. 



The series, Figs. 4752, show parts of the 

 neck and the region just posterior to it, viewed 

 as transparent objects. The region of the neck 

 represented by each figure is indicated approx- 

 imately in Fig. 46 by the numbered areas enclosed by parallel 

 lines, the number in each case corresponding to the number of 

 the figure. All six figures were drawn from a single preparation, 

 a whole mount of scolex and neck-region, which was fixed in the 

 extended condition while slightly flattened between two slides. 

 The longitudinal muscle -layer is indicated by parallel broken 

 lines, and the nephridial canals are drawn in. Nuclei and their 

 general distribution are represented by the stippling. 



52 



FIG. 46. 



FIG. 47. 



In Fig. 47, which shows the region at the posterior end of the 

 scolex itself, the nuclei in the region between the nephridial 

 canals and the longitudinal muscles, where they are most abun- 

 dant, show faint indications of an arrangement in parallel bands, 

 groups, or zones extending transversely. The groups of the two 

 sides of the body appear to be entirely separate from each other, 



