PLATE XII. 



Fig. 13 b. Septum of A. HOFFMANNII. 



I'AOF 



Fig. 11. Septum of AMMONITES TRASKII. 63 



Fig. 12 b. Septum of A. KAMOSUS. 65 



The dorsal lobe was obliterated by weathering. 



65 



Fig. 14. A. REMONDII. 66 



Coarsely costate variety. 



Fig. 15. A. REMONDII. 66 



Nodose variety. 



