PLATE XXII 



CEPHALOPODA: TETRABRANCHIA 



i. Nautilus radiatus, Sby. Fossil : Neocomian ; s. septa. 

 For recent Nautilus, see Plate I. 



2. Aturia ziczdc, Sby. Fossil : Eocene. 



3. Clymenia striata, Munst. Fossil : Devonian. 



4. Orthoceras Ludense, Sby., in section. Fossil : Silurian, 



5. Cophinocems Eifeliense, d'Arch. Fossil : Devonian. 



6. Prolecanites Hensloivi, Sby. Fossil : Carboniferous. 



7. Baculites anceps, Lamk. Fossil : Cretaceous. 



8. Cosmoceras spinosum, Sby. Fossil : Oxford Clay 



9. Acanthocerds RJwtomagense, Brongn. Fossil: Chalk. 



10. Toxoceras annulare, d'Orb. Fossil : Neocomian. 



11. Crioceras cristatum, d'Orb. Fossil: Gault. 



12. Ancyloceras spinigcium. Sby. Fossil: Gault. 



13. Hamitcs attcnuatus, Sby. Fossil : Gault. 



14. Tumlites costatus, Lamk. Fossil : Chalk. 



15. Hclicoceras rotundum, Sby. Fossil : Gault. 



16. Scaphites .equalis, Sby. Fossil : Chalk. 



%* All Figs, from drawings by S. P. Woodward, 



