184 C. M. CHIIJ). 



Plate X. 



Fig. 9. From the region of the lateral longitudinal nerve-cords in the " neck 



Figs. 10-14. From the general parenchyma in neck-region. 



Figs. 15-16. Interproglottidal glands after differentiation has begun. 



Figs, 17,18,19. Cells of the subcuticular layer from the neck-region. 



