PLATE XX. 



Figs. 1, 2. Escharella indivisa n. sp. 

 Fig. 1. Zooecia and ooecia. 



— 2. Zooecia in basai view showing the arrangement of 



the pore-chambers. 

 Figs, 3— 9. Escharella lahiata Boeck. 



Fig. 3. Zooecia showing the marginal pores and the spout- 

 shaped projection towards the aperture. 



— 4. Basal view of the zooecia showing the arrangement 



of the pore-chambers. 



— 5. Upper part of a zooecium in basal view. 



— 6. Lateral view of a zooecium. 



— 7. Lateral view of an ooecium and the upper part of a 



zooecium. 



— 8. Aperture with oral spines. 



— 9. Base of an ooecium. 



Figs. 10 — 14. Esharella abyssicola Norman. 



Fig. 10. Upper part of a zooecium with oral spines and mar- 

 ginal pores. 



— 11. Upper part of a zooecium showing the screen-shaped 



peristomal projection. 



— 12. Aperture with surrounding spines and median tooth. 



— 13. Basal wall of a zooecium. 



— 14. Basal wall of an ooecium in connection with the 



upper part of the zooecium. 



