41 



APPENDIX III. 



RANGE OF THE GENERA OF THE FOSSIL CEPHALOPODA 

 IN GEOLOGICAL TIME* 



1. 



2. 



3. 



4. 



5. 



6. 



7. 



8. 



9. 

 10. 

 11. 

 12. 

 13. 

 14. 

 15. 

 16. 

 17. 

 18. 

 19. 

 20. 

 21. 

 22. 

 23. 

 24. 



Argonauta . . . 

 Enoploteuthis 

 Plesioteuthis 

 Ommastrephes 



Loligo 



Tcudopsis 



Phylloteuthis 

 Beloteutliis ... 

 Geoteuthis .... 

 Leptotcuthis..., 



Sepia 



Belcmuosis .... 



Bcloptera 



Heliccrus 



Spirulirostra.... 

 Belcmnites .... 

 Belemnitclla.... 

 Bolemnotcuthis 

 Conoteutliis .... 

 Xiphotcuthis . 



Nautilus 



Discoceras .... 

 Ophidioceras.... 

 Gyroccras 



* The stars opposite a genus in one or more of the columns, show that the genus 

 existed in the geological period referred to in the column or columns, 

 f The Jurassic formation includes the Oolite and the Lias. 



4 



