330 S. WELLER FAUNA OF THE FERN GLEN FORMATION 



Plate 13 



Spirif er grimesi Hall page 304 



Figures 1-2. Dorsal and ventral views of a nearly complete specimen. 

 Spirif er vernonensis Swallow page 302 



Figures 3-6. Ventral, anterior, dorsal, and lateral views of a perfect 

 specimen. 



Figure 7. Ventral view of a broader specimen. 



Figure 8. Ventral view of a large individual. 

 Spirif er fernglenensis n. sp page 30(5 



Figures 9-10. Ventral and lateral views of a ventral valve. 

 Spirif er chouteauensis n. sp page 305 



Figure 11. Dorsal view of a somewhat crushed specimen. 

 Spirif erina magnicostata n. sp page 307 



Figures 12, 13, 15. Views of three incomplete ventral valves. 



Figure 14. Posterior view of a distorted specimen. 

 Spirif erina subtexta White page 300 



Figures 16-18. Ventral, anterior, and posterior views of a perfect ven- 

 tral valve. 



Figure 19. View of a dorsal valve. 

 Cyrtina turlingtonensis Rowley page 310 



Figures 20-22. Ventral, dorsal, and lateral views of a perfect speci- 

 men (from Chouteau limestone, Pettis county, Mis- 

 souri). 



Figure 23. View of an imperfect ventral valve from Fern Glen. 



