PLATE I. 



4 . Shell of the Sepia rugosa. 



2. Shell of the Calmar. Loligo sa git lata, Lam. 



3. 4. Nummulites, with sections. 



5. Discorbite. 



6. Miliolite cceur de Serpent. 



7. Lituolite. 



8. Transverse and longitudinal sections of a Belemnile. 



9. 10. 11. 12. Belemnites. 



13. Spirolinites . 



14. Upper and under view, with a section, of the Gyrogonites medicagi- 



nula. 



15. Simplegades colubrinus. 



16. Turrilites compressus. 



17. Bacilli tes vertebralis. 



18. «. Spirula Jragilis seu australis. 



b. The siphon traversing the chambers. , 

 <?. Section magnified. 



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