PLATE X. 



PAOE 



Fig. 4. Ammonites subtricarinatus. 60 



Natural size. 

 4 a. End view of the fragment. 



Fig. 5. A. Newberryanus. 61 



Natural size. Mount Diablo. 



Fig. 6. A. Newberryanus. 61 



Natural size. Cottonwood Creek 

 6 a. Front view. 

 6 6. Septum. 



Fig. 7. A. Brewerii. 62 



$ Natural size. 



Fig. 8,8 a. A. Haydenii. 62 



| Natural size. 

 8 b. Septum. 



Fig. 9. A. Peruvianas ? 68 



Natural size 



