Rand. —Nerve-Cell Centroaome. 



PLATE 3. 



Fig. 14. Parasagittal section through the anterior end of a worm after 7 days' re- 

 generation. X 25. Hermann's plat.-acet.-osm., iron-hsematoxylin. 



Fig. 15. Parasagittal section through the anterior end of a worm after 16 days' re- 

 generation. X 25. Acetic-sublimate, iron-hsematoxylin. 



Fig. 16. Parasagittal section through tlie anterior end of a worm after 24 days' 

 regeneration. X 25. Acetic-sublimate, iron-haematoxylin. 



Fig. 17. Spindle cells from the cicatrix of tlie worm from which Figure 14 is 

 taken. (7 days' regeneration.) X 2000. 



