ILLUSTRATIONS 



Plates (following page 74) 



Plate 1. Species of Marginulina and Robulus. 



2. Species of Marginulina, Robulus, Saracenaria, and Lingulina. 



3. Species of Marginulina, Dentalina, Vaginulina, Nodosaria, and Pseudo- 



glandulina. 



4. Species of Nodosaria and Lagena. 

 5-8. Species of Lagena. 



9. Species of Lagena, Sigmomorphina, Guttulina, Pseudopolymorphina, 

 Pyrulina, and Glandulina. 



10. Species of Nonion and Nonionella. 



11. Species of Nonionella and Elphidium. 



12. Species of Elphidium and Ozawaia. 

 13-15. Species of Operculina. 



16. Species of Operculina and Heierostegina. 



17. Species of Heierostegina. 



18. Species of Cycloclypeus and Operculinella. 



19. Species of Peneroplis, Spirolina, Monalysidium, AlveoUnella, and 



VI 



