PLATE XXII. 



PAGE 



Fig. 12. Ammonites jugalis, from the Martinez Group at Benieia. 133 



12 a. Cross section of body whorl. 



12 b. Septum from same specimen. 



Fig- 13. A specimen of the same from Martinez. 



13 a. Front view of same. 



Fig. 14. A. Whitneyii. 134 



1 4 a. Front view of the same. 

 14 b. Septum of the same. 



