PLATE IV. 



Page. 



Orthoceras caldwellensis, n. sp 31 



Fig. 1. Lateral view. 

 Fig. 2. Transverse view. 



POTERIOCERAS .TERSE YENSIB, n . Bp 32 



Fig. 3. Lateral view. 



GONIATITES BLARI, n. Bp 35 



Fig. 4. Lateral view. 



Fig. 5. Part of outer margin. 



GONIATITES PARRI8HI, n. Bp 36 



Fig. 6. View of a septum. 

 Fig. 7. Lateral view. 

 Fig. 8. Ventral view. 



GONIATITES ELK HORN EN BIS, n. Bp 37 



Fig. 9. Lateral view. 

 Fig. 10. Ventral view. 

 Fig. 11. View of a septum. 



GONIATITES MONTGOMERY EN 81 8, n. Bp 38 



Fig. 12. Lateral view. 

 Fig. 13. Ventral view. 

 Fig. 14. View of a Beptum. 



GONIATITES PULTONENSI8, n. 8p 39 



Fig. 15. Lateral view. 

 Fig. 16. Ventral view. 

 Fig. 17. View of a septum. 



