PLATE XXIII. 



Discopora scabra Fabr. 

 Zooecia and ooecia. 

 Operculum. 



Schizoporella f^Emb allot heca) stylifera Levinsen. 

 Zooecia and ooecia. 

 Zooecia in basal view. 



Aperture of a zooecium with the two large rounded 

 hinge-teeth. 



— 6. Operculum. 



— 7. Zooecia showing marginal pores. 

 Figs. 8 — 11. Escharina vulgaris Moll. 



Fig. 8. Ancestrula with surrounding zooecia. 



— 9. Zooecia with ooecium and avicularium. 



— 10. Zooecia with marginal and frontal pores and two 



oral spines. 



— 11. Upper part of a zooecium showing the proximal sinus 



and four oral spines. 

 Figs. 12—13. Schizoporella unicornis Johnston. 



Fig. 12. Upper part of a zooecium with proximal sinus of the 

 aperture and two oral spines. 



— 13. Operculum with chitineous ridges. 



