PLATE VI. 



Fig. i. — Cristellaria robusta, sp. now, x 25. 



a. — Peripheral aspect. 



b. — Lateral aspect. 

 Fig. 2. — Cristellaria budensis, (Hantken), x 31. 



a. — Lateral aspect. 



b. — Peripheral aspect. 

 Fig. 3. — Siphogenerina sulcata, sp. nov. , x 64. 



a. — Lateral aspect. 



b. — Oral aspect. 

 Fig. 4. — Bigenerina conica, Heron-Allen & Earland, x 64. 



a. — Lateral aspect. 



b. — Oral aspect. 

 Fig. 5. — Bigenerina selseyensis, Heron-Allen & Earland, x 73. 



a. — Lateral aspect. 



b. — Oral aspect. 

 Fig. 6. — Spirillina selseyensis, Heron-Allen & Earland, x 64. 



a, b. — Lateral aspects. 



c. — Peripheral aspect. 

 Fig. 7. — Chapmania gassinensis, Silvestri, X31. 



Much worn specimen. 

 Figs. 8, 9. — Halkyardia minima, (Liebus), x 36. 



a. — Superior aspect. 



b. — Inferior aspect. 



c. — Peripheral aspect. 



9. — Vertical section. 

 Figs. 10, 11. — Halkyardia ovata, sp. nov., x 36. 



a. — Superior aspect. 



b. — Infei ior aspect. 



II. — Young specimen. 



Fig. 12. — Halkyardia ovata, sp. nov., x 64. 



Diagrammatic horizontal section. 



