PLATE L. 



Zone of Amaltheus oxynotus ? 



Fig. 1. Aegoceras Slatteri, Wright. Side view, natural size. T. J. Slatter, Esq., 



F.G.S. 



2. — — — Siphonal area. do. 1 A11 ,, • f 



r _ ' | All the specimens of 



3 — — — Eront view. 1 ,, • . • ■ , . 



\ this species are in his 



4 - Si P honal area - collection. 



5. — Do. j 



6. — — Young shell showing a keel, natural size. 



7. — — — Do. do. siphonal area with keel. 



8. — — — Lobe-line, magnified. 



Zone of Aeyoceras Jamesoni. 



9. — carxjsense, d'Orbiyny. Side view, natural size. - My collection. 



10. — — — Siphonal area. 



11. — densinodum, Quenstedt. Side view, natural size. do. 



12. — — — Siphonal area, do. 



13. — brevispina, Sowerby. Side view, do. Collection of the 



Rev. J. E. Cross, E.G.S. 



14. — — — Siphonal area, natural size. 



