-8^ C O N C H O L O G Y. 



14. Fragment of a foffil Orthoceratites, 

 in which the chambers and the fiphuncu- 

 lus are diftinftly fhewn ; from Breynius de 

 Polythalamiis. Tab. 6. fig. i. 



15. An Ammonoides foffil. 



1 6. The Pearly Chambered Nautilus, or 

 Sailor, and 



17. The fame Shell cut open, to (hew 

 its internal chambered ftrufture. 



18. TheLituus or Rams Horn, and 



19. The fame Shell cut open, to fhew its 

 internal chambered ftrufture. 



20. An Ammonites fpffil, and 



21. The fame laid open, to fhew its in- 

 ternal chambered ftrudture. 



PLATE 



