98 EXPLANATION OF PLATES. 



also lined with ciliee. It is very probable that such a 

 ciliated vesicle opens towards the free surface in the course 

 of its development. 



FIG. 54. From the same preparation as Fig. 53. 



M. p. III. 8. 



A vesicle which has already lost its ciliary lining. The protoplasmic 

 wall of the vesicle grows towards the cavity in form of a protoplasmic 

 reticulum like that in Fig. 50. In that way gradually a nodule may 

 result which possesses the structure of a lymph-follicle endo-lym- 

 phangial nodule. 



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