7* OswAt.* dtl. 



17. Lyticoceras Noricum, Sowby ; Cretaceous (Neocomian). 



18. Helicoceras Robertianum, d'Orb. ; Cretaceous (Neocomian). 



19. Heteroceras Emeriti, d'Orb. ; Cretaceous (Neocomian). 



20. Toxoceras annulare, d'Orb. ; Cretaceous (Neocomian). 



ax. Torneidoceras (Hamites) rotiindatum, Sowby ; Cretaceous (Gault). 



22. Douvilleiceras mammillare, Schloth. ; Cretaceous (Gault). 



23. Crioceras Emeriti, Lev. ; Cretaceous (Neocomian). 



24. Anisoceras Saussureanus, Pictet ; Cretaceous (Gault). 



25. Ancyloceras Matheronxanum, d'Orb.; Cretaceous (Neocomian). 



26. Turrilites catenatus, d'Orb. ; Cretaceous (Gault). 



27. Bostrychoceras polyplocum, Roemer ; Cretaceous (Senonian). 



28. Bactriles elegans, Sandb. ; Devonian. 



29. Anarcesles subnautilinus, Schloth. ; Devonian. 



30. Orthoceras (Geisonoceras) timidum, Barr. ; Silurian. 



In some cases the suture-lines are given. 



