PLATE XIL 



The lettering is the same in all the figures. 



Corattimorphus rigidtis. D, Oc. 2 (figs. 1-7). 



Figs. 1-4. Young ovicells in the endoderm ; in figs. 2 and 3 two cells depicted in the 

 act of mioratins; into the mesoderm. 



Fig. 5. Ovicells with filamental apparatus ; 

 apparatus still lie completely in the epithelium. 



Fig. 6. Ovicells with filamental apparatus ; 

 apparatus migrating into the mesoderm. 



7. Ovicells with filamental apparatus. 



the epithelial cells of the filamental 

 the epithelial cells of the filamental 



Fig. 



Halcampa clavus. D, Oc. 1 (figs. 8, 9, 11). 



Figs. 8 and 9. Two ovicells of different ages with the epithelial apparatus. 

 Fig. 11. Ovicells which lie partly in the endoderm, partly in the mesoderm. 



Cereiis spinosus (fig. 10). 

 Fig. 10. Transverse section through an acontium of Cereiis S2yinosus. C, Oc. 2. 



