PLATE I. 



Fig. 



1. Nautilus Baberi, p. 10, side view. 

 la. — — front view. 



2. Nautilus subtruncatus, p. 10, side view. 

 2 a. — — front view. 



3. Ammonites gracilis, p. 12, young; and p. 105, Plate XIII, figs. 2, 2a, adult. 



4. Ammonites Waterhousei, p. 13, side view. 

 4 a. — — front view. 



5. Belemnites Bessinus, p. 8. 



7. — — showing the phragmacone. 



6. 8. Belemnites fusiformis, p. 8. 



