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. i .,, ^, . . 



^ I All tne specimens ot 



3. — — — Front view. i ,, . . ... 



) this species are in his 



4. — — — Siphonal 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 Aegoceras Jamesoni. 



9. — CARUSENSE, d'Orbigng. Side view, natural size. My collection. 



10. — • — — Siphonal area. 



11. — DENSiNODUM, ^/'(!6'w.f?'e^/. Side view, natural sizc. do. 



12. — — — Siphonal area, do. 



13. — BRLVispiNA, Sovoerby. Side view, do. Collection of the 



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



14. — — — Siphonal area, natural size. 



