PLATE I. 
1. Nautilus Baberi, y. 10, side view. 
la. — — front view. 
2. Nautilus subtruncatus, py. 10, side view. 
2a. _ — front view. 
3. Ammonites gracilis, y.12, young; and p. 105, Plate XII, figs. 2, 2a, adult. 
4. Ammonites Waterhousei, p. 13, side view. 
Aa. a — front view. 
5. Belemnites Bessinus, p. 8. 
ie _ — showing the phragmacone. 
6, 8. Belemnites fusiformis, p. 8. 
