262 POPULAR CONCHOLOGY. 



5. Conilites. 



*20. Polystomella, 



*21. Vorticialis. 



22. Nummulites. 



23. Nautilus. 



24. Ammonites. 



25. Orbulites. 



26. Ammonoceras. 



27. Turrilites. 



28. Baculites. 



29. Argonauta. 



30. Octopus. 



31. Loligopsis. 



32. Loligo. 



33. Sepia. 



6. Spirula. 

 *7. Spirolina. 

 *8. Lituola. 

 *9. Renulina. 



*10. Cristellaria. 

 #11. Orbiculina. 



*12. Miliola. 



13. Gyrogona, 

 *14. Melonia. 

 *15. Rotalia. 



*16. Lenticulina. 

 *17. Placentula. 



#18. Discorbis. 



*19. Siderolites. 



Those genera which are marked thus* are 

 now removed from the Cephalopoda, having 

 been proved to differ from molluscous animals 

 by Dujardin, and by him are placed in a distinct 

 class. He says they are inferior in their or- 

 ganization to the Badiata, and endowed with 

 locomotive power by the instrumentality of 

 minute tentacular filaments. Ehrenburg makes 

 them belong to the second great division {Bry- 

 ozoa) of his coral animals. 



No. 4. in the list proves to be a Bivalve, not 

 unlike a Chama. No. 13. is the seed of the 

 Char a. Nos. 5. 25. 26. are doubtful genera. 



