Rand. — Nerve-Cell Ceutrosome. 



PLATE 8. 



All the figures magnified 2000 diameters. 



Figs. 53-56. Recently divided subepidermal or basal cells of the old epidermis, 

 from one to four segments back of the segment cut. The centrosome 

 of mitosis persists in the resting cells. 7 days after the operation. 

 Hermann's plat.-acet.-osm., iron-haematoxylin. 



Fig. 57. Group of cells, with nuclei of the epidermal type, from a thin layer of 

 cells lying directly beneatli the regenerated epidermis of a worm of 11 

 days' regeneration. Hermann's plat.-acet.-osm., iron-haematoxylin. 



Figs. 58-60. Dividing cells from the layer of cells mentioned in the explanation of 

 Figure 57, showing peculiar conditions as to the presence of a nuclear 

 membrane. See page 149. 



