Rand. — Nerve-Cell Centrosome. 



PLATE 2. 

 All the figures magnified 2000 diameters. 



Figs. 7-9. Smaller cells from tlie posterior dorsal region of the brain of a normal 



worm. Iron-haematoxylin. 

 Figs. 10-12. Cells from a regenerated brain after 34 days' regeneration. These 



three cells lay side by side in the same section. Iron-hcematoxylin. 

 Fig. 13. Cell from a brain of 34 days' regeneration. Iron-haematoxylin. 



